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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0704.1301 | Todd Hunter | T.R. Hunter, Q. Zhang, T.K. Sridharan | IRAS 18317-0757: A Cluster of Embedded Massive Stars and Protostars | 36 pages, 13 figures, published in Astrophysical Journal | Astrophys.J.606:929-942,2004 | 10.1086/383181 | null | astro-ph | null | We present high-resolution, multiwavelength continuum and molecular-line
images of the massive star forming region IRAS 18317-0757. The IR through mm
spectral energy distribution can be approximated by a two-temperature model (25
and 63 K) with a total luminosity of approximately log(L/Lsun)=5.2. Previous
submm imaging resolved this region into a cluster of 5 dust cores, one of which
is associated with the UCHII region G23.96+0.15, and another with an H2O maser.
In our new 2.7 mm continuum image, only the UCHII region is detected, with
total flux and morphology in good agreement with the free-free emission in VLA
cm-wave maps. For the other four objects, the nondetections at 2.7 mm and in
the MSX mid-IR bands are consistent with cool dust emission with a temperature
of 13-40K and luminosity of 1000-40000 Lsun. By combining single-dish and
interferometric data, we have identified over two dozen virialized C18O cores
in this region that contain ~40% of the total molecular gas mass present. While
the overall extent of the C18O and dust emission is similar, the emission peaks
do not correlate well in detail. At least 11 of the 123 stars identified by
2MASS in this region are likely to be within the star-forming cluster. Two
stars (both associated with the UCHII region) were previously identified as O
stars via IR spectroscopy. Most of the rest of the reddened stars have no
obvious correlation with the C18O cores or the dust cores. In summary, our
observations indicate that considerable fragmentation of the molecular cloud
has taken place during the time required for the UCHII region to form and the O
stars to become detectable at IR wavelengths. Additional star formation appears
to be ongoing on the periphery of the central region, where up to four B-type
(proto)stars have formed among a substantial number of C18O molecular cores.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 20:05:06 GMT"
}
] | 2009-11-16T00:00:00 | [
[
"Hunter",
"T. R.",
""
],
[
"Zhang",
"Q.",
""
],
[
"Sridharan",
"T. K.",
""
]
] |
0704.1302 | Vallery Stanishev | V. Stanishev, Z. Kraicheva, V. Genkov | Photometry of the SW Sex-type nova-like BH Lyncis in high state | null | Astronomy and Astrophysics, Volume 455, Issue 1, August III 2006,
pp.223-226 | 10.1051/0004-6361:20054530 | null | astro-ph | null | Aims: We present a photometric study of the deeply eclipsing SW Sex-type
nova-like cataclysmic variable star BH Lyn
Methods: Time-resolved V-band CCD photometry was obtained for seven nights
between 1999 and 2004.
Results: We determined 11 new eclipse timings of BH Lyn and derived a refined
orbital ephemeris with an orbital period of 0.155875577(14) day. During the
observations, BH Lyn was in high-state with V~15.5 mag. The star presents ~1.5
mag deep eclipses with mean full-width at half-flux of 0.0683(+/-0.0054)P_orb.
The eclipse shape is highly variable, even changing form cycle to cycle. This
is most likely due to accretion disc surface brightness distribution
variations, most probably caused by strong flickering. Time-dependent accretion
disc self-occultation or variations of the hot spot(s) intensity are also
possible explanations. Negative superhumps with period of ~0.145 day are
detected in two long runs in 2000. A possible connection between SW Sex and
negative superhump phenomena through the presence of tilted accretion disc is
discussed, and a way to observationally test this is suggested.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 20:19:16 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Stanishev",
"V.",
""
],
[
"Kraicheva",
"Z.",
""
],
[
"Genkov",
"V.",
""
]
] |
0704.1303 | Steven Taylor | Steven M Taylor | General Doppler Shift Equation and the Possibility of Systematic Error
in Calculation of Z for High Redshift Type Ia Supernovae | null | null | null | null | physics.gen-ph | null | Systematic error in calculation of z for high redshift type Ia supernovae
could help explain unexpected luminosity values that indicate an accelerating
rate of expansion of the universe.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 20:26:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Taylor",
"Steven M",
""
]
] |
0704.1304 | Kevin Heng | Kevin Heng | The Reverse Shock of SNR 1987A | Highlights of invited talk at Aspen conference: "Supernova 1987A: 20
Years After -- Supernovae & Gamma-Ray Bursters" | AIP Conf.Proc.937:51-57,2007 | 10.1063/1.2803617 | null | astro-ph | null | The reverse shock of supernova remnant (SNR) 1987A emits in H-alpha and
Ly-alpha, and comes in two flavors: surface and interior. The former is due to
direct, impact excitation of hydrogen atoms crossing the shock, while the
latter is the result of charge transfer reactions between these atoms and
slower, post-shock ions. Interior and surface emission are analogous to the
broad- and narrow-line components observed in Balmer-dominated SNRs. I
summarize a formalism to derive line intensities and ratios in these SNRs, as
well as a study of the transition zone in supernova shocks; I include an
appendix where I derive in detail the ratio of broad to narrow H-alpha
emission. Further study of the reverse shock emission from SNR 1987A will allow
us to predict when it will vanish and further investigate the origins of the
interior emission.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 20:38:19 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Heng",
"Kevin",
""
]
] |
0704.1305 | Cristiano Nisoli | Cristiano Nisoli, Paul E. Lammert, Eric Mockensturm and Vincent H.
Crespi | Carbon Nanostructures as an Electromechanical Bicontinuum | 4 pages 2 figures. Version accepted by Phys. Rev. Lett | null | 10.1103/PhysRevLett.99.045501 | null | cond-mat.mtrl-sci cond-mat.other | null | A two-field model provides an unifying framework for elasticity, lattice
dynamics and electromechanical coupling in graphene and carbon nanotubes,
describes optical phonons, nontrivial acoustic branches, strain-induced gap
opening, gap-induced phonon softening, doping-induced deformations, and even
the hexagonal graphenic Brillouin zone, and thus explains and extends a
previously disparate accumulation of analytical and computational results.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 20:36:30 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Jun 2007 19:29:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nisoli",
"Cristiano",
""
],
[
"Lammert",
"Paul E.",
""
],
[
"Mockensturm",
"Eric",
""
],
[
"Crespi",
"Vincent H.",
""
]
] |
0704.1306 | Drake Deming | Drake Deming, L. Jeremy Richardson, and Joseph Harrington | 3.8-Micron Photometry During the Secondary Eclipse of the Extrasolar
Planet HD 209458b | 5 pages, 5 figures, in press for MNRAS | Mon.Not.Roy.Astron.Soc.378:148-152,2007 | 10.1111/j.1365-2966.2007.11754.x | null | astro-ph | null | We report infrared photometry of the extrasolar planet HD 209458b during the
time of secondary eclipse (planet passing behind the star). Observations were
acquired during two secondary eclipses at the NASA Infrared Telescope Facility
(IRTF) in September 2003. We used a circular variable filter (1.5-percent
bandpass) centered at 3.8 microns to isolate the predicted flux peak of the
planet at this wavelength. Residual telluric absorption and instrument
variations were removed by offsetting the telescope to nearby bright comparison
stars at a high temporal cadence. Our results give a secondary eclipse depth of
0.0013 +/- 0.0011, not yet sufficient precision to detect the eclipse, whose
expected depth is approximately 0.002 - 0.003. We here elucidate the current
observational limitations to this technique, and discuss the approach needed to
achieve detections of hot Jupiter secondary eclipses at 3.8 microns from the
ground.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 21:15:45 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Deming",
"Drake",
""
],
[
"Richardson",
"L. Jeremy",
""
],
[
"Harrington",
"Joseph",
""
]
] |
0704.1307 | Lucia Masetti | L. Masetti | Ke4 decays and Wigner cusp | Contribution to the proceedings of HQL06, Munich, October 16th-20th
2006 | ECONFC0610161:008,2006 | null | null | hep-ex | null | The NA48/2 experiment at the CERN SPS collected in 2003 and 2004 large
samples of the decays K+- -> pi+ pi- e+- nu (Ke4+-), K+- -> pi0 pi0 e+- nu
(Ke400) and K+- -> pi0 pi0 pi+-. From the Ke4+- form factors and from the cusp
in the M00^2 distribution of the K+- -> pi0 pi0 pi+- events, the pi-pi
scattering lengths a00 and a20 could be extracted. This measurement is a
fundamental test of Chiral Perturbation Theory (ChPT). The branching fraction
and form factors of the Ke400 decay were precisely measured, using a much
larger data sample than in previous experiments. An improved measurement of the
slope parameters for the decay K+- -> pi0 pi0 pi+- showed evidence for a
non-zero value of k.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 20:41:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Masetti",
"L.",
""
]
] |
0704.1308 | Nihar Jindal | Nihar Jindal | Antenna Combining for the MIMO Downlink Channel | Submitted to IEEE Trans. Wireless Communications April 2007. Revised
August 2007 | null | 10.1109/T-WC.2008.070383 | null | cs.IT math.IT | null | A multiple antenna downlink channel where limited channel feedback is
available to the transmitter is considered. In a vector downlink channel
(single antenna at each receiver), the transmit antenna array can be used to
transmit separate data streams to multiple receivers only if the transmitter
has very accurate channel knowledge, i.e., if there is high-rate channel
feedback from each receiver. In this work it is shown that channel feedback
requirements can be significantly reduced if each receiver has a small number
of antennas and appropriately combines its antenna outputs. A combining method
that minimizes channel quantization error at each receiver, and thereby
minimizes multi-user interference, is proposed and analyzed. This technique is
shown to outperform traditional techniques such as maximum-ratio combining
because minimization of interference power is more critical than maximization
of signal power in the multiple antenna downlink. Analysis is provided to
quantify the feedback savings, and the technique is seen to work well with user
selection and is also robust to receiver estimation error.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 20:56:14 GMT"
},
{
"version": "v2",
"created": "Sun, 19 Aug 2007 17:06:50 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Jindal",
"Nihar",
""
]
] |
0704.1309 | Daniel Burgarth | Daniel Burgarth | Quantum State Transfer with Spin Chains | PhD thesis, December 2006, University College London, 142 pages | null | null | null | quant-ph | null | The thesis covers various aspects of quantum state transfer in permanently
coupled spin systems.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 21:05:31 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Burgarth",
"Daniel",
""
]
] |
0704.1310 | Sergei Chmutov | Sergei Chmutov and Jeremy Voltz | Thistlethwaite's theorem for virtual links | 7 pages, many figures | null | null | null | math.GT math.CO | null | The celebrated Thistlethwaite theorem relates the Jones polynomial of a link
with the Tutte polynomial of the corresponding planar graph. We give a
generalization of this theorem to virtual links. In this case, the graph will
be embedded into a (higher genus) surface. For such graphs we use the
generalization of the Tutte polynomial discovered by B.Bollobas and O.Riordan.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 20:58:33 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chmutov",
"Sergei",
""
],
[
"Voltz",
"Jeremy",
""
]
] |
0704.1311 | Anzhong Wang | Andreas Tziolas and Anzhong Wang | Colliding Branes and Formation of Spacetime Singularities | four figures | Phys.Lett.B661:5-10,2008 | 10.1016/j.physletb.2008.01.058 | null | hep-th astro-ph gr-qc hep-ph | null | We construct a class of analytic solutions with two free parameters to the
five-dimensional Einstein field equations, which represents the collision of
two timelike 3-branes. We study the local and global properties of the
spacetime, and find that spacelike singularities generically develop after the
collision, due to the mutual focus of the two branes. Non-singular spacetime
can be constructed only in the case where both of the two branes violate the
energy conditions.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 21:09:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tziolas",
"Andreas",
""
],
[
"Wang",
"Anzhong",
""
]
] |
0704.1312 | Davar Khoshnevisan | Robert C. Dalang, Davar Khoshnevisan, and Eulalia Nualart | Hitting probabilities for systems of non-linear stochastic heat
equations with multiplicative noise | 51 pages | null | null | null | math.PR | null | We consider a system of d non-linear stochastic heat equations in spatial
dimension 1 driven by d-dimensional space-time white noise. The non-linearities
appear both as additive drift terms and as multipliers of the noise. Using
techniques of Malliavin calculus, we establish upper and lower bounds on the
one-point density of the solution u(t,x), and upper bounds of Gaussian-type on
the two-point density of (u(s,y),u(t,x)). In particular, this estimate
quantifies how this density degenerates as (s,y) converges to (t,x). From these
results, we deduce upper and lower bounds on hitting probabilities of the
process {u(t,x)}_{t \in \mathbb{R}_+, x \in [0,1]}, in terms of respectively
Hausdorff measure and Newtonian capacity. These estimates make it possible to
show that points are polar when d >6 and are not polar when d<6. We also show
that the Hausdorff dimension of the range of the process is 6 when d>6, and
give analogous results for the processes t \mapsto u(t,x) and x \mapsto u(t,x).
Finally, we obtain the values of the Hausdorff dimensions of the level sets of
these processes.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 21:20:22 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Dalang",
"Robert C.",
""
],
[
"Khoshnevisan",
"Davar",
""
],
[
"Nualart",
"Eulalia",
""
]
] |
0704.1313 | Sergei Chmutov | S.V.Chmutov, S.K.Lando | Mutant knots and intersection graphs | 13 pages, many figures | Algebr. Geom. Topol. 7 (2007) 1579-1598 | 10.2140/agt.2007.7.1579 | null | math.GT math.CO | null | We prove that if a finite order knot invariant does not distinguish mutant
knots, then the corresponding weight system depends on the intersection graph
of a chord diagram rather than on the diagram itself. The converse statement is
easy and well known. We discuss relationship between our results and certain
Lie algebra weight systems.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 21:40:10 GMT"
}
] | 2016-01-20T00:00:00 | [
[
"Chmutov",
"S. V.",
""
],
[
"Lando",
"S. K.",
""
]
] |
0704.1314 | Henrik Bruus | S. Melker Sundin, Thomas Glasdam Jensen, Henrik Bruus and Jorg P.
Kutter | Acoustic resonances in microfluidic chips: full-image micro-PIV
experiments and numerical simulations | RevTex, 10 pages, 9 eps figures; NOTE first authors changed his name
to S. Melker Hagsater in the published version | Lab Chip 7, 1336--1344 (2007) | 10.1039/b704864e | null | physics.flu-dyn | null | We show that full-image micro-PIV analysis in combination with images of
transient particle motion is a powerful tool for experimental studies of
acoustic radiation forces and acoustic streaming in microfluidic chambers under
piezo-actuation in the MHz range. The measured steady-state motion of both
large 5 um and small 1 um particles can be understood in terms of the acoustic
eigenmodes or standing ultra-sound waves in the given experimental
microsystems. This interpretation is supported by numerical solutions of the
corresponding acoustic wave equation.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 22:45:45 GMT"
}
] | 2012-01-31T00:00:00 | [
[
"Sundin",
"S. Melker",
""
],
[
"Jensen",
"Thomas Glasdam",
""
],
[
"Bruus",
"Henrik",
""
],
[
"Kutter",
"Jorg P.",
""
]
] |
0704.1315 | Jonathan Smoker | J. V. Smoker, I. Hunter, P. M. W. Kalberla, F. P. Keenan, R. Morras,
R. Hanuschik, H. M. A. Thompson, D. Silva, E. Bajaja, W. G. L. Poppel, M.
Arnal | Observations towards early-type stars in the ESO-POP survey: II --
searches for intermediate and high velocity clouds | Accepted by MNRAS | Mon.Not.Roy.Astron.Soc.378:947-954,2007 | 10.1111/j.1365-2966.2007.11807.x | null | astro-ph | null | We present CaII K and TiII optical spectra of early-type stars taken mainly
from the UVES Paranal Observatory Project, plus HI 21-cm spectra from the
Vila-Elisa and Leiden-Dwingeloo surveys, which are employed to obtain distances
to intermediate and high velocity clouds. HI emission at a velocity of -117
km/s towards the sightline HD 30677 with NHI=1.7x10^19 cm-2 has no
corresponding CaII K absorption, which has a signal-to-noise (S/N) ratio of
610. The star has a spectroscopically determined distance of 2.7-kpc, and hence
sets this as a firm lower distance limit towards Anti-Centre cloud ACII.
Towards another sightline (HD 46185), HI at +122 km/s and NHI=1.2x10^19 cm-2 is
seen. The CaII K spectrum has a S/N = 780, although no absorption is observed
at the cloud velocity. This similarly places a firm lower distance limit of
2.9-kpc towards this parcel of gas that may be an intermediate velocity cloud.
The lack of intermediate velocity (IV) CaII K absorption towards HD 196426 at a
S/N = 500 reinforces a lower distance limit of 700-pc towards this part of
Complex gp, where NHI is 1.1x10^19 cm-2 and velocity is +78 km/s. Additionally,
no IV CaII K is seen in absorption in the spectrum of HD 19445, which is strong
in HI with NHI=8x10^19 cm-2 at -42 km/s, placing a firm although uninteresting
lower distance limit of 39-pc to this part of IV South. Finally, no HV CaII K
absorption is seen towards HD 115363 at a S/N = 410, placing a lower distance
of 3.2-kpc towards the HVC gas at velocity of +224 km/s and NHI=5.2x10^19 cm-2.
This gas is in the same region of the sky as complex WE (Wakker 2001), but at
higher velocities. The non-detection of CaII K absorption sets a lower distance
of 3.2-kpc towards the HVC, which is unsurprising if this feature is indeed
related to the Magellanic System.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 21:57:35 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Smoker",
"J. V.",
""
],
[
"Hunter",
"I.",
""
],
[
"Kalberla",
"P. M. W.",
""
],
[
"Keenan",
"F. P.",
""
],
[
"Morras",
"R.",
""
],
[
"Hanuschik",
"R.",
""
],
[
"Thompson",
"H. M. A.",
""
],
[
"Silva",
"D.",
""
],
[
"Bajaja",
"E.",
""
],
[
"Poppel",
"W. G. L.",
""
],
[
"Arnal",
"M.",
""
]
] |
0704.1316 | Ralph Scheicher | S. Gowtham, Ralph H. Scheicher, Rajeev Ahuja, Ravindra Pandey, Shashi
P. Karna | Physisorption of Nucleobases on Graphene | 7 pages, 3 figures | Phys. Rev. B 76, 033401 (2007) | 10.1103/PhysRevB.76.033401 | null | cond-mat.mtrl-sci cond-mat.soft | null | We report the results of our first-principles investigation on the
interaction of the nucleobases adenine (A), cytosine (C), guanine (G), thymine
(T), and uracil (U) with graphene, carried out within the density functional
theory framework, with additional calculations utilizing Hartree--Fock plus
second-order Moeller-Plesset perturbation theory. The calculated binding energy
of the nucleobases shows the following hierarchy: G > T ~ C ~ A > U, with the
equilibrium configuration being very similar for all five of them. Our results
clearly demonstrate that the nucleobases exhibit significantly different
interaction strengths when physisorbed on graphene. The stabilizing factor in
the interaction between the base molecule and graphene sheet is dominated by
the molecular polarizability that allows a weakly attractive dispersion force
to be induced between them. The present study represents a significant step
towards a first-principles understanding of how the base sequence of DNA can
affect its interaction with carbon nanotubes, as observed experimentally.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 17:08:13 GMT"
}
] | 2007-07-05T00:00:00 | [
[
"Gowtham",
"S.",
""
],
[
"Scheicher",
"Ralph H.",
""
],
[
"Ahuja",
"Rajeev",
""
],
[
"Pandey",
"Ravindra",
""
],
[
"Karna",
"Shashi P.",
""
]
] |
0704.1317 | Naftali Sommer | Naftali Sommer, Meir Feder and Ofir Shalvi | Low Density Lattice Codes | 24 pages, 4 figures. Submitted for publication in IEEE transactions
on Information Theory | null | null | null | cs.IT math.IT | null | Low density lattice codes (LDLC) are novel lattice codes that can be decoded
efficiently and approach the capacity of the additive white Gaussian noise
(AWGN) channel. In LDLC a codeword x is generated directly at the n-dimensional
Euclidean space as a linear transformation of a corresponding integer message
vector b, i.e., x = Gb, where H, the inverse of G, is restricted to be sparse.
The fact that H is sparse is utilized to develop a linear-time iterative
decoding scheme which attains, as demonstrated by simulations, good error
performance within ~0.5dB from capacity at block length of n = 100,000 symbols.
The paper also discusses convergence results and implementation considerations.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 16:07:34 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Sommer",
"Naftali",
""
],
[
"Feder",
"Meir",
""
],
[
"Shalvi",
"Ofir",
""
]
] |
0704.1318 | Rodrigo A. Ibata | R. Ibata, N. F. Martin, M. Irwin, S. Chapman, A. M. N. Ferguson, G. F.
Lewis, A. W. McConnachie | The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy
formation in action | 38 pages, 55 figures, submitted to ApJ. High resolution version
available at http://palantir.u-strasbg.fr/~ibata/pdf/0704.1318.pdf Please do
not bother with the astro-ph version - the figures are devoid of information | Astrophys.J.671:1591-1623,2007 | 10.1086/522574 | null | astro-ph | null | We present a deep photometric survey of M31, conducted with the CFHT and INT,
covering the inner 50 kpc of the galaxy, the Southern quadrant out to 150 kpc,
and extending to M33. This is the first systematic panoramic study of this very
outermost region of galaxies. We detect several streams and other large-scale
structures, and two new dwarf galaxies: And XV and XVI. The discovery of
substructure on the minor axis, together with the fact that the light profile
between 0.5 < R < 1.3 follows the exponential ``extended disk'', is
particularly important in shedding light on the mixed and sometimes conflicting
results reported in previous studies. Underlying the substructures lies a
faint, metal-poor, smooth and extremely extended halo, reaching out to at least
150 kpc. The smooth halo component in M31 has a profile that can be fit with a
Hernquist model of immense scale radius ~55 kpc, almost a factor of 4 larger
than theoretical predictions. Alternatively a power-law with exponent -1.91 +/-
0.11 can be fit to the profile. The total luminosity of this structure is
similar to that of the halo of the Milky Way. This vast, smooth, underlying
halo is reminiscent of a classical monolithic model and completely unexpected
from modern galaxy formation models. M33 is also found to have an extended
metal-poor halo component, which can be fit with a Hernquist model also of
scale radius ~55 kpc. These extended slowly-decreasing halos will provide a
challenge and strong constraints for further modeling. [Abridged]
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 23:46:38 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Ibata",
"R.",
""
],
[
"Martin",
"N. F.",
""
],
[
"Irwin",
"M.",
""
],
[
"Chapman",
"S.",
""
],
[
"Ferguson",
"A. M. N.",
""
],
[
"Lewis",
"G. F.",
""
],
[
"McConnachie",
"A. W.",
""
]
] |
0704.1319 | David Brookes | David T. Brookes, Eugenia Etkina | Using conceptual metaphor and functional grammar to explore how language
used in physics affects student learning | Accepted for publication in Phys. Rev. ST:PER | null | 10.1103/PhysRevSTPER.3.010105 | null | physics.ed-ph | null | This paper introduces a theory about the role of language in learning
physics. The theory is developed in the context of physics students' and
physicists' talking and writing about the subject of quantum mechanics. We
found that physicists' language encodes different varieties of analogical
models through the use of grammar and conceptual metaphor. We hypothesize that
students categorize concepts into ontological categories based on the
grammatical structure of physicists' language. We also hypothesize that
students over-extend and misapply conceptual metaphors in physicists' speech
and writing. Using our theory, we will show how, in some cases, we can explain
student difficulties in quantum mechanics as difficulties with language.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 22:51:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brookes",
"David T.",
""
],
[
"Etkina",
"Eugenia",
""
]
] |
0704.1320 | Keith R. Dienes | Keith R. Dienes, Michael Lennek, David S\'en\'echal, Vaibhav Wasnik | Supersymmetry versus Gauge Symmetry on the Heterotic Landscape | 29 pages, LaTeX, 4 figures, 7 tables | Phys.Rev.D75:126005,2007 | 10.1103/PhysRevD.75.126005 | null | hep-th | null | One of the goals of the landscape program in string theory is to extract
information about the space of string vacua in the form of statistical
correlations between phenomenological features that are otherwise uncorrelated
in field theory. Such correlations would thus represent predictions of string
theory that hold independently of a vacuum-selection principle. In this paper,
we study statistical correlations between two features which are likely to be
central to any potential description of nature at high energy scales: gauge
symmetries and spacetime supersymmetry. We analyze correlations between these
two kinds of symmetry within the context of perturbative heterotic string
vacua, and find a number of striking features. We find, for example, that the
degree of spacetime supersymmetry is strongly correlated with the probabilities
of realizing certain gauge groups, with unbroken supersymmetry at the string
scale tending to favor gauge-group factors with larger rank. We also find that
nearly half of the heterotic landscape is non-supersymmetric and yet
tachyon-free at tree level; indeed, less than a quarter of the tree-level
heterotic landscape exhibits any supersymmetry at all at the string scale.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 23:24:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dienes",
"Keith R.",
""
],
[
"Lennek",
"Michael",
""
],
[
"Sénéchal",
"David",
""
],
[
"Wasnik",
"Vaibhav",
""
]
] |
0704.1321 | Henrik Bruus | Misha Marie Gregersen, Laurits H. Olesen, Anders Brask, Mikkel Fougt
Hansen, Henrik Bruus | Reversed flow at low frequencies in a microfabricated AC electrokinetic
pump | RevTex, 9 pages, 6 eps figures | PHYSICAL REVIEW E 76, 056305 (2007) | 10.1103/PhysRevE.76.056305 | null | physics.flu-dyn | null | Microfluidic chips have been fabricated to study electrokinetic pumping
generated by a low voltage AC signal applied to an asymmetric electrode array.
A measurement procedure has been established and followed carefully resulting
in a high degree of reproducibility of the measurements. Depending on the ionic
concentration as well as the amplitude of the applied voltage, the observed
direction of the DC flow component is either forward or reverse. The impedance
spectrum has been thoroughly measured and analyzed in terms of an equivalent
circuit diagram. Our observations agree qualitatively, but not quantitatively,
with theoretical models published in the literature.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 23:21:01 GMT"
}
] | 2009-01-20T00:00:00 | [
[
"Gregersen",
"Misha Marie",
""
],
[
"Olesen",
"Laurits H.",
""
],
[
"Brask",
"Anders",
""
],
[
"Hansen",
"Mikkel Fougt",
""
],
[
"Bruus",
"Henrik",
""
]
] |
0704.1322 | Dmitriy Palatnik | Dmitriy Palatnik | Energy of 4-Dimensional Black Hole, etc | 5 pages, 0 figures | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter I suggest possible redefinition of mass density, not depending
on speed of the mass element, which leads to a more simple stress-energy for an
object. I calculate energy of black hole.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 23:10:16 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Jan 2011 16:56:42 GMT"
},
{
"version": "v3",
"created": "Sat, 9 Jul 2011 16:27:18 GMT"
},
{
"version": "v4",
"created": "Thu, 14 Jul 2011 14:55:37 GMT"
},
{
"version": "v5",
"created": "Mon, 18 Jul 2011 14:23:19 GMT"
}
] | 2011-07-19T00:00:00 | [
[
"Palatnik",
"Dmitriy",
""
]
] |
0704.1323 | Tetsuo Matsui | Tomoyoshi Ono, Ikuo Ichinose, Tetsuo Matsui | Multi-Higgs U(1) Lattice Gauge Theory in Three Dimensions | 4pages, 9 figures | null | null | null | cond-mat.supr-con cond-mat.stat-mech hep-lat | null | We study the three-dimensional compact U(1) lattice gauge theory with $N$
Higgs fields numerically. This model is relevant to multi-component
superconductors, antiferromagnetic spin systems in easy plane, inflational
cosmology, etc. For N=2, the system has a second-order phase transition line
$\tilde{c}_1(c_2)$ in the $c_2$(gauge coupling)$-c_1$(Higgs coupling) plane,
which separates the confinement phase and the Higgs phase. For N=3, the
critical line is separated into two parts; one for $c_2 \alt 2.25$ with
first-order transitions, and the other for $c_2 \agt 2.25$ with second-order
transitions.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 23:25:50 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 16:49:11 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ono",
"Tomoyoshi",
""
],
[
"Ichinose",
"Ikuo",
""
],
[
"Matsui",
"Tetsuo",
""
]
] |
0704.1324 | Igor Moskalenko | Igor V. Moskalenko (Stanford), Lawrence L. Wai (SLAC) | Identifying Dark Matter Burners in the Galactic center | 2 pages, 2 figures; to appear in the Proc. of the First Int. GLAST
Symp. (Stanford, Feb. 5-8, 2007), eds. S.Ritz, P.F.Michelson, and C.Meegan,
AIP Conf. Proc | AIPConf.Proc.921:508-509,2007 | 10.1063/1.2757425 | SLAC-PUB-12468 | astro-ph hep-ph | null | If the supermassive black hole (SMBH) at the center of our Galaxy grew
adiabatically, then a dense "spike" of dark matter is expected to have formed
around it. Assuming that dark matter is composed primarily of weakly
interacting massive particles (WIMPs), a star orbiting close enough to the SMBH
can capture WIMPs at an extremely high rate. The stellar luminosity due to
annihilation of captured WIMPs in the stellar core may be comparable to or even
exceed the luminosity of the star due to thermonuclear burning. The model thus
predicts the existence of unusual stars, i.e. "WIMP burners", in the vicinity
of an adiabatically grown SMBH. We find that the most efficient WIMP burners
are stars with degenerate electron cores, e.g. white dwarfs (WD) or degenerate
cores with envelopes. If found, such stars would provide evidence for the
existence of particle dark matter and could possibly be used to establish its
density profile. In our previous paper we computed the luminosity from WIMP
burning for a range of dark matter spike density profiles, degenerate core
masses, and distances from the SMBH. Here we compare our results with the
observed stars closest to the Galactic center and find that they could be
consistent with WIMP burners in the form of degenerate cores with envelopes. We
also cross-check the WIMP burner hypothesis with the EGRET observed flux of
gamma-rays from the Galactic center, which imposes a constraint on the dark
matter spike density profile and annihilation cross-section. We find that the
EGRET data is consistent with the WIMP burner hypothesis. New high precision
measurements by GLAST will confirm or set stringent limits on a dark matter
spike at the Galactic center, which will in turn support or set stringent
limits on the existence of WIMP burners at the Galactic center.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 02:37:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Moskalenko",
"Igor V.",
"",
"Stanford"
],
[
"Wai",
"Lawrence L.",
"",
"SLAC"
]
] |
0704.1325 | Agnieszka Janiuk | Agnieszka Janiuk, Ye-Fei Yuan, Rosalba Perna, Tiziana di Matteo | Instabilities in the time-dependent neutrino disc in Gamma-Ray Bursts | 23 pages, 18 figures; accepted for publication in ApJ | Astrophys.J.664:1011-1025,2007 | 10.1086/518761 | null | astro-ph | null | We investigate the properties and evolution of accretion tori formed after
the coalescence of two compact objects. At these extreme densities and
temperatures, the accreting torus is cooled mainly by neutrino emission
produced primarily by electron and positron capture on nucleons (beta
reactions). We solve for the disc structure and its time evolution by
introducing a detailed treatment of the equation of state which includes
photodisintegration of helium, the condition of beta-equilibrium, and neutrino
opacities. We self-consistently calculate the chemical equilibrium in the gas
consisting of helium, free protons, neutrons and electron-positron pairs and
compute the chemical potentials of the species, as well as the electron
fraction throughout the disc. We find that, for sufficiently large accretion
rates (> 10 solar masses per second), the inner regions of the disk become
opaque and develop a viscous and thermal instability. The identification of
this instability might be relevant for GRB observations.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 18:29:35 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Janiuk",
"Agnieszka",
""
],
[
"Yuan",
"Ye-Fei",
""
],
[
"Perna",
"Rosalba",
""
],
[
"di Matteo",
"Tiziana",
""
]
] |
0704.1326 | Victor Manosa | Victor Manosa | Complete integrable systems with unconfined singularities | null | J. Difference Equations and Applications 14 (6) (2008), 667--670 | 10.1080/10236190801912332 | null | nlin.SI | null | We prove that any globally periodic rational discrete system in K^k(where K
denotes either R or C), has unconfined singularities, zero algebraic entropy
and it is complete integrable (that is, it has as many functionally independent
first integrals as the dimension of the phase space). In fact, for some of
these systems the unconfined singularities are the key to obtain first
integrals using the Darboux-type method of integrability.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 23:39:46 GMT"
}
] | 2010-12-23T00:00:00 | [
[
"Manosa",
"Victor",
""
]
] |
0704.1327 | Kevin Ford | Kevin Ford, Florian Luca, Igor E. Shparlinski | On the largest prime factor of the Mersenne numbers | 11 pages | Bull. Austr. Math. Soc. 79 (2009), 455-463 | null | null | math.NT | null | Let P(k) be the largest prime factor of the positive integer k. In this
paper, we prove that the series $\sum_{n\ge 1}\frac{(\log n)^a}{P(2^n-1)}$ is
convergent for each constant a<1/2, which gives a more precise form of a result
of C. L. Stewart from 1977.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 23:42:43 GMT"
}
] | 2009-06-18T00:00:00 | [
[
"Ford",
"Kevin",
""
],
[
"Luca",
"Florian",
""
],
[
"Shparlinski",
"Igor E.",
""
]
] |
0704.1328 | Igor Moskalenko | Igor V. Moskalenko (Stanford), Andrew W. Strong (MPE), Seth W. Digel
(SLAC), Troy A. Porter (UCSC) | Developing the Galactic diffuse emission model for the GLAST Large Area
Telescope | 2 pages, 2 figures; to appear in the Proc. of the First Int. GLAST
Symp. (Stanford, Feb. 5-8, 2007), eds. S.Ritz, P.F.Michelson, and C.Meegan,
AIP Conf. Proc | AIPConf.Proc.921:490-491,2007 | 10.1063/1.2757416 | SLAC-PUB-12467 | astro-ph | null | Diffuse emission is produced in energetic cosmic ray (CR) interactions,
mainly protons and electrons, with the interstellar gas and radiation field and
contains the information about particle spectra in distant regions of the
Galaxy. It may also contain information about exotic processes such as dark
matter annihilation, black hole evaporation etc. A model of the diffuse
emission is important for determination of the source positions and spectra.
Calculation of the Galactic diffuse continuum gamma-ray emission requires a
model for CR propagation as the first step. Such a model is based on theory of
particle transport in the interstellar medium as well as on many kinds of data
provided by different experiments in Astrophysics and Particle and Nuclear
Physics. Such data include: secondary particle and isotopic production cross
sections, total interaction nuclear cross sections and lifetimes of radioactive
species, gas mass calibrations and gas distribution in the Galaxy (H_2, H I, H
II), interstellar radiation field, CR source distribution and particle spectra
at the sources, magnetic field, energy losses, gamma-ray and synchrotron
production mechanisms, and many other issues. We are continuously improving the
GALPROP model and the code to keep up with a flow of new data. Improvement in
any field may affect the Galactic diffuse continuum gamma-ray emission model
used as a background model by the GLAST LAT instrument. Here we report about
the latest improvements of the GALPROP and the diffuse emission model.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 02:39:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Moskalenko",
"Igor V.",
"",
"Stanford"
],
[
"Strong",
"Andrew W.",
"",
"MPE"
],
[
"Digel",
"Seth W.",
"",
"SLAC"
],
[
"Porter",
"Troy A.",
"",
"UCSC"
]
] |
0704.1329 | Nayantara Gupta | Nayantara Gupta and Bing Zhang | Prompt Emission of High Energy Photons from Gamma Ray Bursts | 18 pages 10figures, version to be published in MNRAS | Mon.Not.Roy.Astron.Soc.380:78,2007 | 10.1111/j.1365-2966.2007.12051.x | null | astro-ph | null | Within the internal shock scenario we consider different mechanisms of high
energy ($>1$ MeV) photon production inside a Gamma Ray Burst (GRB) fireball and
derive the expected high energy photon spectra from individual GRBs during the
prompt phase. The photon spectra of leptonic and hadronic origins are compared
within different sets of parameter regimes. Our results suggest that the high
energy emission is dominated by the leptonic component if fraction of shock
energy carried by electrons is not very small (e.g. $\epsilon_e > 10^{-3}$).
For very small values of $\epsilon_e$ the hadronic emission component could be
comparable to or even exceed the leptonic component in the GeV-TeV regime.
However, in this case a much larger energy budget of the fireball is required
to account for the same level of the observed sub-MeV spectrum. The fireballs
are therefore extremely inefficient in radiation. For a canonical fireball bulk
Lorentz factor (e.g. $\Gamma=400$), emissions above $\sim 10$ GeV are
attenuated by two-photon pair production processes. For a fireball with an even
higher Lorentz factor, the cutoff energy is higher, and emissions of 10 TeV -
PeV due to $\pi^0$-decay can also escape from the internal shocks. The flux
level is however too low to be detected by current TeV detectors, and these
photons also suffer attenuation by external soft photons.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 23:50:39 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 19:14:22 GMT"
},
{
"version": "v3",
"created": "Thu, 31 May 2007 21:01:37 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Gupta",
"Nayantara",
""
],
[
"Zhang",
"Bing",
""
]
] |
0704.1330 | Nadya Shirokova | Nadya Shirokova | On the classification of Floer-type theories | 30 pages | null | null | null | math.GT math.SG | null | In this paper we outline a program for the classification of Floer-type
theories, (or defining invariants of finite type for families). We consider
Khovanov complexes as a local system on the space of knots introduced by V.
Vassiliev and construct the wall-crossing morphism. We extend this system to
the singular locus by the cone of this morphism and introduce the definition of
the local system of finite type. This program can be further generalized to the
manifolds of dimension 3 and 4.
| [
{
"version": "v1",
"created": "Tue, 10 Apr 2007 23:53:33 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Shirokova",
"Nadya",
""
]
] |
0704.1331 | Thomas Tucker J | Dragos Ghioca and Thomas J. Tucker | Siegel's theorem for Drinfeld modules | 24 pages | null | null | null | math.NT math.AG | null | We prove an analog of Siegel's theorem for integral points in the context of
Drinfeld modules. The result holds for finitely generated submodules of the
additive group over a function field of transcendence dimension 1.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 00:14:50 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ghioca",
"Dragos",
""
],
[
"Tucker",
"Thomas J.",
""
]
] |
0704.1332 | Assane Lo | Assane Lo | On the Exponential Decay of the n-point Correlation Functions and the
Analyticity of the Pressure | null | null | 10.1063/1.2819601 | null | math-ph math.MP | null | The goal of this paper is to provide estimates leading to a direct proof of
the exponential decay of the n-point correlation functions for certain
unbounded models of Kac type. The methods are based on estimating higher order
derivatives of the solution of the Witten Laplacian equation on one forms
associated with the hamiltonian of the system. We also provide a formula for
the Taylor coefficients of the pressure that is suitable for a direct proof the
analyticity.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 00:22:26 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 20:40:57 GMT"
},
{
"version": "v3",
"created": "Wed, 13 Jun 2007 21:40:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lo",
"Assane",
""
]
] |
0704.1333 | Thomas Tucker J | Dragos Ghioca and Thomas J. Tucker | A dynamical version of the Mordell-Lang conjecture for the additive
group | 13 pages | null | 10.1112/S0010437X07003260 | null | math.NT math.AG | null | We prove a dynamical version of the Mordell-Lang conjecture in the context of
Drinfeld modules. We use analytic methods similar to the ones employed by
Skolem, Chabauty, and Coleman for studying diophantine equations.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 00:23:06 GMT"
}
] | 2014-01-14T00:00:00 | [
[
"Ghioca",
"Dragos",
""
],
[
"Tucker",
"Thomas J.",
""
]
] |
0704.1334 | Eunil Won | E. Won, J. H. Choi, H. Ha, H. J. Hyun, H. J. Kim, H. Park | Fabrication of Analog Electronics for Serial Readout of Silicon Strip
Sensors | minor typos corrected, and additional acknowledgement included. To be
submitted to JINST | null | null | null | physics.ins-det | null | A set of analog electronics boards for serial readout of silicon strip
sensors was fabricated. A commercially available amplifier is mounted on a
homemade hybrid board in order to receive analog signals from silicon strip
sensors. Also, another homemade circuit board is fabricated in order to
translate amplifier control signals into a suitable format and to provide bias
voltage to the amplifier as well as to the silicon sensors. We discuss
technical details of the fabrication process and performance of the circuit
boards we developed.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 00:29:56 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Apr 2007 01:50:57 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Won",
"E.",
""
],
[
"Choi",
"J. H.",
""
],
[
"Ha",
"H.",
""
],
[
"Hyun",
"H. J.",
""
],
[
"Kim",
"H. J.",
""
],
[
"Park",
"H.",
""
]
] |
0704.1335 | Steven Zucker | Steven Zucker | On the reductive Borel-Serre compactification: $L^p$-cohomology of
arithmetic groups (for large $p$) | 32 pages | Amer. J. Math. 123 (2001), 951-984 | null | null | math.AG math.AT | null | The $L^2$-cohomology of a locally symmetric variety is known to have the
topological interpretation as the intersection homology of its Baily-Borel
Satake compactification. In this article, we observe that even without the
Hermitian hypothesis, the $L^p$-cohomology of an arithmetic quotient, for $p$
finite and sufficiently large, is isomorphic to the ordinary cohomology of its
reductive Borel-Serre compactification. We use this to generalize a theorem of
Mumford concerning homogeneous vector bundles, their invariant Chern forms and
the canonical extensions of the bundles; here, though, we are referring to
canonical extensions to the reductive Borel-Serre compactification of any
arithmetic quotient. To achieve that, we give a systematic discussion of vector
bundles and Chern classes on stratified
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 00:46:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Zucker",
"Steven",
""
]
] |
0704.1336 | Sofia Quaglioni | S. Quaglioni and P. Navratil | The $^4$He total photo-absorption cross section with two- plus
three-nucleon interactions from chiral effective field theory | 6 pages, 4 figures | Phys.Lett.B652:370-375,2007 | 10.1016/j.physletb.2007.06.082 | UCRL-JRNL-229340 | nucl-th | null | The total photo-absorption cross section of $^4$He is evaluated
microscopically using two- (NN) and three-nucleon (NNN) interactions based upon
chiral effective field theory ($\chi$EFT). The calculation is performed using
the Lorentz integral transform method along with the {\em ab initio} no-core
shell model approach. An important feature of the present study is the
consistency of the NN and NNN interactions and also, through the Siegert
theorem, of the two- and three-body current operators. This is due to the
application of the $\chi$EFT framework. The inclusion of the NNN interaction
produces a suppression of the low-energy peak and enhancement of the
high-energy tail of the cross section. We compare to calculations obtained
using other interactions and to representative experiments. The rather confused
experimental situation in the giant resonance region prevents discrimination
among different interaction models.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 01:28:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Quaglioni",
"S.",
""
],
[
"Navratil",
"P.",
""
]
] |
0704.1337 | Frieder Kleefeld | F. Kleefeld (Nucl. Phys. Inst., Rez near Prague / CFIF, Lisbon) | Comment on "Mass and Width of the Lowest Resonance in QCD" | 2 pages, no figures | null | null | FK-2007-2 | hep-ph | null | I. Caprini's, G. Colangelo's, and H. Leutwyler's (CCL) article "Mass and
Width of the Lowest Resonance in QCD", Phys. Rev. Lett. 96, 132001 (2006)
[hep-ph/0512364], is critically reviewed. The present comment is devoted to
complement a recent experimental discussion (D.V. Bugg, J. Phys. G 34, 151
(2007) [hep-ph/0608081]) of short-comings in the CCL analysis, by presenting
theoretical arguments pointing at a serious flaw in the theoretical formalism
used by CCL, and also at the unlikeliness of their tiny error bars in the
sigma-meson mass and width. The criticism made in the comment applies
analogously to the analysis on the kappa-meson mass performed in the article
"The K0*(800) scalar resonance from Roy-Steiner representations of pi K
scattering" published as S. Descotes-Genon and B. Moussallam, Eur. Phys. J. C
48, 553 (2006) [hep-ph/0607133].
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 01:41:47 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kleefeld",
"F.",
"",
"Nucl. Phys. Inst., Rez near Prague / CFIF, Lisbon"
]
] |
0704.1338 | Tiziana Di Matteo | Ruipeng Liu, T. Di Matteo, Thomas Lux | True and Apparent Scaling: The Proximity of the Markov-Switching
Multifractal Model to Long-Range Dependence | 13 pages, accepted for publication in Physica A | null | 10.1016/j.physa.2007.04.085 | null | q-fin.ST physics.soc-ph | null | In this paper, we consider daily financial data of a collection of different
stock market indices, exchange rates, and interest rates, and we analyze their
multi-scaling properties by estimating a simple specification of the
Markov-switching multifractal model (MSM). In order to see how well the
estimated models capture the temporal dependence of the data, we estimate and
compare the scaling exponents $H(q)$ (for $q = 1, 2$) for both empirical data
and simulated data of the estimated MSM models. In most cases the multifractal
model appears to generate `apparent' long memory in agreement with the
empirical scaling laws.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 01:16:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Liu",
"Ruipeng",
""
],
[
"Di Matteo",
"T.",
""
],
[
"Lux",
"Thomas",
""
]
] |
0704.1339 | Stefan C. Keller | S.C. Keller, B.P. Schmidt and M.S Bessell | SkyMapper and the Southern Sky Survey - a resource for the southern sky | 6 pages, 4 figures, proceedings of ESO Calibration Workshop 2007 | null | 10.1007/978-3-540-76963-7_78 | null | astro-ph | null | SkyMapper is amongst the first of a new generation of dedicated, wide-field
survey telescopes. The 1.3m SkyMapper telescope features a 5.7 square degree
field-of-view Cassegrain imager and will see first light in late 2007. The
primary goal of the facility is to conduct the Southern Sky Survey a six
colour, six epoch survey of the southern sky. The survey will provide
photometry for objects between 8th and 23rd magnitude with global photometric
accuracy of 0.03 magnitudes and astrometry to 50 mas. This will represent a
valuable scientific resource for the southern sky and in addition provide a
basis for photometric and astrometric calibration of imaging data.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 02:19:48 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Keller",
"S. C.",
""
],
[
"Schmidt",
"B. P.",
""
],
[
"Bessell",
"M. S",
""
]
] |
0704.1340 | Deepak Khosla | Deepak Khosla | Tautological classes on moduli spaces of curves with linear series and a
push-forward formula when $\rho=0$ | 26 pages, 4 figures. New version of math.AG/0608024 with applications | null | null | null | math.AG | null | We define tautological Chow classes on the moduli space of curves with linear
series. In the case where the forgetful morphism to the moduli space of curves
has relative dimension zero, we describe the images of these classes in the
Chow group of Mgbar. As an application, we compute the (virtual) slopes of
several different classes of divisors on Mgbar.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 02:33:11 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Khosla",
"Deepak",
""
]
] |
0704.1341 | Guangxiang Su | Guangxiang Su | Equivariant symmetric bilinear torsions | Abstract and introduction have been made some modifications, also
some details are added | null | null | null | math.DG | null | We extend the main result in the previous paper of Zhang and the author
relating the Milnor-Turaev torsion with the complex valued analytic torsion to
the equivariant case.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 02:47:57 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Apr 2007 02:18:45 GMT"
},
{
"version": "v3",
"created": "Sat, 14 Apr 2007 12:20:47 GMT"
},
{
"version": "v4",
"created": "Fri, 20 Apr 2007 07:18:39 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Su",
"Guangxiang",
""
]
] |
0704.1342 | Youngman Kim | Y. Kim, T. Sato, F. Myhrer and K. Kubodera | Two-pion-exchange contributions to the pp\to pp\pi^0 reaction | 11 pages, minor change, a few references are added | Phys.Lett.B657:187-191,2007 | 10.1016/j.physletb.2007.10.023 | USC(NT)-07-03 | nucl-th | null | Our previous study of the near-threshold pp\to pp\pi^0 reaction based on a
hybrid nuclear effective field theory is further elaborated by examining the
momentum dependence of the relevant transition operators. We show that the
two-pion exchange diagrams give much larger contributions than the one-pion
exchange diagram, even though the former is of higher order in the Weinberg
counting scheme. The relation between our results and an alternative counting
scheme, the momentum counting scheme, is also discussed.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 03:21:33 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Apr 2007 05:47:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kim",
"Y.",
""
],
[
"Sato",
"T.",
""
],
[
"Myhrer",
"F.",
""
],
[
"Kubodera",
"K.",
""
]
] |
0704.1343 | Ismail Kombe | Ismail Kombe | Hardy and Rellich type inequalities with remainders for Baouendi-Grushin
vector fields | null | null | null | null | math.AP math.FA | null | In this paper we study Hardy and Rellich type inequalities for
Baouendi-Grushin vector fields : $\nabla_{\gamma}=(\nabla_x,
|x|^{2\gamma}\nabla_y)$ where $\gamma>0$, $\nabla_x$ and $\nabla_y$ are usual
gradient operators in the variables $x\in \mathbb{R}^m$ and $y\in\mathbb{R}^k$,
respectively. In the first part of the paper, we prove some weighted Hardy type
inequalities with remainder terms. In the second part, we prove two versions of
weighted Rellich type inequality on the whole space. We find sharp constants
for these inequalities. We also obtain their improved versions for bounded
domains.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 03:37:47 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kombe",
"Ismail",
""
]
] |
0704.1344 | Chuan-Ren Chen | Qing-Hong Cao and Chuan-Ren Chen | Resummation Effects in the Search of SM Higgs Boson at Hadron Colliders | The version to appear in PRD | Phys.Rev.D76:073006,2007 | 10.1103/PhysRevD.76.073006 | UCRHEP-T428, MSUHEP-061208 | hep-ph | null | We examine the soft-gluon resummation effects, including the exact spin
correlations among the final state particles, in the search of the Standard
Model Higgs boson, via the process $gg\to H\to WW/ZZ \to 4 leptons, at the
Tevatron and the LHC. A comparison between the resummation and the
Next-to-Leading order (NLO) calculation is performed after imposing various
kinematics cuts suggested in the literature for the Higgs boson search. For the
$H\to ZZ$ mode, the resummation effects increase the acceptance of the signal
events by about 25%, as compared to the NLO prediction, and dramatically alter
various kinematics distributions of the final state leptons. For the $H\to WW$
mode, the acceptance rates of the signal events predicted by the resummation
and NLO calculations are almost the same, but some of the predicted kinematical
distributions are quite different. Thus, to precisely determine the properties
of the Higgs boson at hadron colliders, the soft-gluon resummation effects have
to be taken into account.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 04:17:27 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Sep 2007 23:43:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Chen",
"Chuan-Ren",
""
]
] |
0704.1345 | Shigehiro Yasui | S. Yasui and M. Oka | Triquark structure and isospin symmetry breaking in exotic Ds mesons | null | Phys.Rev.D76:034009,2007 | 10.1103/PhysRevD.76.034009 | null | hep-ph | null | The color anti-triplet triquark $q\bar{q}\bar{q}$ is considered as a compact
component in the tetraquark structure $cq\bar{q}\bar{q}$ of exotic $D_{s}$
mesons. We discuss the mass spectrum and the flavor mixing of the triquarks by
using the instanton induced interaction and the one-gluon exchange potentials.
As a characteristic property of the triquark, we investigate the isospin
violation. It is shown that the flavor $\bar{\bf 3}$ (isosinglet) and $\bf 6$
(isotriplet) states may be strongly mixed and then are identified with
$D_{s}(2632)$.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 04:55:40 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Apr 2007 05:29:48 GMT"
},
{
"version": "v3",
"created": "Tue, 19 Jun 2007 06:23:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yasui",
"S.",
""
],
[
"Oka",
"M.",
""
]
] |
0704.1346 | K. M Hiremath | K. M. Hiremath | Prediction of future fifteen solar cycles | 5 pages, 2 figures and one table | null | null | null | astro-ph | null | In the previous study (Hiremath 2006a), the solar cycle is modeled as a
forced and damped harmonic oscillator and from all the 22 cycles (1755-1996),
long-term amplitudes, frequencies, phases and decay factor are obtained. Using
these physical parameters of the previous 22 solar cycles and by an {\em
autoregressive model}, we predict the amplitude and period of the future
fifteen solar cycles. Predicted amplitude of the present solar cycle (23)
matches very well with the observations. The period of the present cycle is
found to be 11.73 years. With these encouraging results, we also predict the
profiles of future 15 solar cycles. Important predictions are : (i) the period
and amplitude of the cycle 24 are 9.34 years and 110 ($\pm 11$), (ii) the
period and amplitude of the cycle 25 are 12.49 years and 110 ($\pm$ 11), (iii)
during the cycles 26 (2030-2042 AD), 27 (2042-2054 AD), 34 (2118-2127 AD), 37
(2152-2163 AD) and 38 (2163-2176 AD), the sun might experience a very high
sunspot activity, (iv) the sun might also experience a very low (around 60)
sunspot activity during cycle 31 (2089-2100 AD) and, (v) length of the solar
cycles vary from 8.65 yrs for the cycle 33 to maximum of 13.07 yrs for the
cycle 35.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 05:03:47 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hiremath",
"K. M.",
""
]
] |
0704.1347 | Sandra Rozensztajn | Sandra Rozensztajn (IRMA) | Comparaison entre cohomologie cristalline et cohomologie \'etale
$p$-adique sur certaines vari\'et\'es de Shimura | null | null | null | null | math.AG | null | Let $X$ be an integral model at a prime $p$ of a Shimura variety of PEL type
having good reduction, associated to a reductive group $G$. To $\mathbb{Z}_p$
reprsententations of the group $G$ can be associated two kinds of sheaves :
crystals on the special fiber of $X$, and locally constant \'etale sheaves on
the generic fiber. We establish a comparison between the cohomology of these
two kinds of sheaves.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 05:22:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Rozensztajn",
"Sandra",
"",
"IRMA"
]
] |
0704.1348 | Marco Tolotti Dr. | Paolo Dai Pra, Wolfgang J. Runggaldier, Elena Sartori, Marco Tolotti | Large portfolio losses: A dynamic contagion model | Published in at http://dx.doi.org/10.1214/08-AAP544 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2009, Vol. 19, No. 1, 347-394 | 10.1214/08-AAP544 | IMS-AAP-AAP544 | q-fin.RM math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using particle system methodologies we study the propagation of financial
distress in a network of firms facing credit risk. We investigate the
phenomenon of a credit crisis and quantify the losses that a bank may suffer in
a large credit portfolio. Applying a large deviation principle we compute the
limiting distributions of the system and determine the time evolution of the
credit quality indicators of the firms, deriving moreover the dynamics of a
global financial health indicator. We finally describe a suitable version of
the "Central Limit Theorem" useful to study large portfolio losses. Simulation
results are provided as well as applications to portfolio loss distribution
analysis.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 13:37:47 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Apr 2008 13:20:24 GMT"
},
{
"version": "v3",
"created": "Wed, 4 Mar 2009 06:59:51 GMT"
}
] | 2009-03-04T00:00:00 | [
[
"Pra",
"Paolo Dai",
""
],
[
"Runggaldier",
"Wolfgang J.",
""
],
[
"Sartori",
"Elena",
""
],
[
"Tolotti",
"Marco",
""
]
] |
0704.1349 | Herbert Koch | Herbert Koch and Daniel Tataru | Carleman estimates and unique continuation for second order parabolic
equations with nonsmooth coefficients | 58 pages, 2 figures | null | null | null | math.AP | null | This work is devoted to the strong unique continuation problem for second
order parabolic equations with nonsmooth coefficients. Introduction and
bibliography have been revised.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 05:49:26 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Jan 2008 06:58:08 GMT"
}
] | 2008-01-10T00:00:00 | [
[
"Koch",
"Herbert",
""
],
[
"Tataru",
"Daniel",
""
]
] |
0704.1350 | Tertychniy Sergey | S. Tertychniy | Specialized computer algebra system for application in general
relativity | null | null | null | null | gr-qc | null | A brief characteristic of the specialized computer algebra system GRG_EC
intended for symbolic computations in the field of general relativity is given.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 06:15:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Tertychniy",
"S.",
""
]
] |
0704.1351 | Stefano Viaggiu | Stefano Viaggiu | Rigidly rotating dust solutions depending upon harmonic functions | typos corrected, final version published in Class. Quantum Grav | Class.Quant.Grav.24:2755-2760,2007 | 10.1088/0264-9381/24/10/018 | null | gr-qc hep-th | null | We write down the relevant field equations for a stationary axially symmetric
rigidly rotating dust source in such a way that the general solution depends
upon the solution of an elliptic equation and upon harmonic functions. Starting
with the dipole Bonnor solution, we built an asymptotically flat solution with
two curvature singularities on the rotational axis with diverging mass. Apart
from the two point singularities on the axis, the metric is regular everywhere.
Finally, we study a non-asymptotically flat solution with NUT charge and a
massless ring singularity, but with a well-defined mass-energy expression.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 06:37:13 GMT"
},
{
"version": "v2",
"created": "Wed, 2 May 2007 06:36:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Viaggiu",
"Stefano",
""
]
] |
0704.1352 | Seick Kim | Steve Hofmann, Seick Kim | The Green function estimates for strongly elliptic systems of second
order | bibliography corrected | Manuscripta Math. Vol. 124 (2007), no. 2, pp. 139-172 | 10.1007/s00229-007-0107-1 | null | math.AP | null | We establish existence and pointwise estimates of fundamental solutions and
Green's matrices for divergence form, second order strongly elliptic systems in
a domain $\Omega \subseteq \mathbb{R}^n$, $n \geq 3$, under the assumption that
solutions of the system satisfy De Giorgi-Nash type local H\"{o}lder continuity
estimates. In particular, our results apply to perturbations of diagonal
systems, and thus especially to complex perturbations of a single real
equation.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:45:40 GMT"
},
{
"version": "v2",
"created": "Sat, 25 Aug 2007 00:45:55 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Hofmann",
"Steve",
""
],
[
"Kim",
"Seick",
""
]
] |
0704.1353 | Paul Prekop | Paul Prekop | Supporting Knowledge and Expertise Finding within Australia's Defence
Science and Technology Organisation | 40th Hawaii International Conference on System Sciences (HICSS40)
2007 | null | null | null | cs.OH cs.DB cs.DL cs.HC | null | This paper reports on work aimed at supporting knowledge and expertise
finding within a large Research and Development (R&D) organisation. The paper
first discusses the nature of knowledge important to R&D organisations and
presents a prototype information system developed to support knowledge and
expertise finding. The paper then discusses a trial of the system within an R&D
organisation, the implications and limitations of the trial, and discusses
future research questions.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 06:49:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Prekop",
"Paul",
""
]
] |
0704.1354 | Philip Harris | C.A. Baker, D.D. Doyle, P. Geltenbort, K. Green, M.G.D. van der
Grinten, P.G. Harris, P. Iaydjiev, S.N. Ivanov, D.J.R. May, J.M. Pendlebury,
J.D. Richardson, D. Shiers, K.F. Smith | Reply to Comment on ``An Improved Experimental Limit on the Electric
Dipole Moment of the Neutron'' | null | Phys.Rev.Lett.98:149102,2007 | 10.1103/PhysRevLett.98.149102 | null | hep-ex | null | The Authors reply to the Comment of Golub and Lamoreaux. The experimental
limit on the neutron electric dipole moment remains unchanged from that
previously announced.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:10:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Baker",
"C. A.",
""
],
[
"Doyle",
"D. D.",
""
],
[
"Geltenbort",
"P.",
""
],
[
"Green",
"K.",
""
],
[
"van der Grinten",
"M. G. D.",
""
],
[
"Harris",
"P. G.",
""
],
[
"Iaydjiev",
"P.",
""
],
[
"Ivanov",
"S. N.",
""
],
[
"May",
"D. J. R.",
""
],
[
"Pendlebury",
"J. M.",
""
],
[
"Richardson",
"J. D.",
""
],
[
"Shiers",
"D.",
""
],
[
"Smith",
"K. F.",
""
]
] |
0704.1355 | Xavier Calmet | Xavier Calmet and Martin Kober | Lowest Landau Level of Relativistic Field Theories in a Strong
Background Field | Submitted for the SUSY07 proceedings,4 pages | Proceedings of the 15th International Conference on Supersymmetry
and the Unification of Fundamental Interactions (SUSY 07). Eds. W. de Boer
and I. Gebauer, Vol. II, pp. 702-705, 2008 | null | null | hep-ph astro-ph hep-th | null | We consider gauge theories in a strong external magnetic like field. This
situation can appear either in conventional four-dimensional theories, but also
naturally in extra-dimensional theories and especially in brane world models.
We show that in the lowest Landau level approximation, some of the coordinates
become non-commutative. We find physical reasons to formal problems with
non-commutative gauge theories such as the issue with SU(N) gauge symmetries.
Our construction is applied to a minimal extension of the standard model. It is
shown that the Higgs sector might be non-commutative whereas the remaining
sectors of the standard model remain commutative. Signatures of this model at
the LHC are discussed. We then discuss an application to a dark matter sector
coupled to the Higgs sector of the standard model and show that here again,
dark matter could be non-commutative, the standard model fields remaining
commutative.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:11:01 GMT"
},
{
"version": "v2",
"created": "Sat, 15 Sep 2007 17:29:16 GMT"
}
] | 2008-04-23T00:00:00 | [
[
"Calmet",
"Xavier",
""
],
[
"Kober",
"Martin",
""
]
] |
0704.1356 | Uli Buchenau | U. Buchenau | Mechanical and dielectric relaxation spectra in seven highly viscous
glass formers | Contribution to the Ngai Fest issue of J. Non-Cryst. Solids; 8 pages,
8 figures, 30 references | J. Non-Cryst. Solids 353,3812 (2007) | 10.1016/j.jnoncrysol.2007.04.034 | null | cond-mat.dis-nn cond-mat.mtrl-sci | null | Published dielectric and shear data of six molecular glass formers and one
polymer are evaluated in terms of a spectrum of thermally activated processes,
with the same barrier density for the retardation spectrum of shear and
dielectrics. The viscosity, an independent parameter of the fit, seems to be
related to the high-barrier cutoff time of the dielectric signal, in accordance
with the idea of a renewal of the relaxing entities after this critical time.
In the five cases where one can fit accurately, the temperature dependence of
the high-barrier cutoff follows the shoving model. The Johari-Goldstein peaks,
seen in four of our seven cases, are describable in terms of gaussians in the
barrier density, superimposed on the high-frequency tail of the
$\alpha$-process. Dielectric and shear measurements of the same substance find
the same peak positions and widths of these gaussians, but in general a
different weight.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:13:41 GMT"
}
] | 2009-09-24T00:00:00 | [
[
"Buchenau",
"U.",
""
]
] |
0704.1357 | Alessandro Stroppa | A. Stroppa, X. Duan, M. Peressi, D. Furlanetto, S. Modesti | Computational and experimental imaging of Mn defects on GaAs (110)
cross-sectional surface | 19 pages, 4 figures, to be published in Phys. Rev. B | Phys. Rev. B 75, 195335 (2007) | 10.1103/PhysRevB.75.195335 | null | cond-mat.mtrl-sci | null | We present a combined experimental and computational study of the (110)
cross-sectional surface of Mn $\delta$-doped GaAs samples. We focus our study
on three different selected Mn defect configurations not previously studied in
details, namely surface interstitial Mn, isolated and in pairs, and
substitutional Mn atoms on cationic sites (Mn$_{\rm Ga}$) in the first
subsurface layer. The sensitivity of the STM images to the specific local
environment allows to distinguish between Mn interstitials with nearest
neighbor As atoms (Int$_{\rm As}$) rather than Ga atoms (Int$_{\rm Ga}$), and
to identify the fingerprint of peculiar satellite features around subsurface
substitutional Mn. The simulated STM maps for Int$_{\rm As}$, both isolated and
in pairs, and Mn$_{\rm Ga}$ in the first subsurface layer are consistent with
some experimental images hitherto not fully characterized.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:18:51 GMT"
}
] | 2011-12-30T00:00:00 | [
[
"Stroppa",
"A.",
""
],
[
"Duan",
"X.",
""
],
[
"Peressi",
"M.",
""
],
[
"Furlanetto",
"D.",
""
],
[
"Modesti",
"S.",
""
]
] |
0704.1358 | Torleiv Kl{\o}ve | Jyh-Shyan Lin, Jen-Chun Chang, Rong-Jaye Chen, Torleiv Kl{\o}ve | Distance preserving mappings from ternary vectors to permutations | 21 pages | null | null | null | cs.DM cs.IT math.IT | null | Distance-preserving mappings (DPMs) are mappings from the set of all q-ary
vectors of a fixed length to the set of permutations of the same or longer
length such that every two distinct vectors are mapped to permutations with the
same or even larger Hamming distance than that of the vectors. In this paper,
we propose a construction of DPMs from ternary vectors. The constructed DPMs
improve the lower bounds on the maximal size of permutation arrays.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:20:34 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Lin",
"Jyh-Shyan",
""
],
[
"Chang",
"Jen-Chun",
""
],
[
"Chen",
"Rong-Jaye",
""
],
[
"Kløve",
"Torleiv",
""
]
] |
0704.1359 | Buric Nikola | Nikola Buric | Hamiltonian Quantum Dynamics With Separability Constraints | null | null | 10.1016/j.aop.2007.04.019 | null | quant-ph | null | Schroedinger equation on a Hilbert space ${\cal H}$, represents a linear
Hamiltonian dynamical system on the space of quantum pure states, the
projective Hilbert space $P {\cal H}$. Separable states of a bipartite quantum
system form a special submanifold of $P {\cal H}$.
We analyze the Hamiltonian dynamics that corresponds to the quantum system
constrained on the manifold of separable states, using as an important example
the system of two interacting qubits. The constraints introduce nonlinearities
which render the dynamics nontrivial. We show that the qualitative properties
of the constrained dynamics clearly manifest the symmetry of the qubits system.
In particular, if the quantum Hamilton's operator has not enough symmetry, the
constrained dynamics is nonintegrable, and displays the typical features of a
Hamiltonian dynamical system with mixed phase space. Possible physical
realizations of the separability constraints are discussed.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:22:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Buric",
"Nikola",
""
]
] |
0704.1360 | Xavier Calmet | Xavier Calmet | Planck Length and Cosmology | 8 pages, to appear in the proceedings of the 2006 CosPA Symposium | Mod.Phys.Lett.A22:2027-2034,2007 | 10.1142/S0217732307025261 | null | astro-ph | null | We show that an unification of quantum mechanics and general relativity
implies that there is a fundamental length in Nature in the sense that no
operational procedure would be able to measure distances shorter than the
Planck length. Furthermore we give an explicit realization of an old proposal
by Anderson and Finkelstein who argued that a fundamental length in nature
implies unimodular gravity. Finally, using hand waving arguments we show that a
minimal length might be related to the cosmological constant which, if this
scenario is realized, is time dependent.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:22:30 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Calmet",
"Xavier",
""
]
] |
0704.1361 | Jack Xin | Jie Liu, Jack Xin, Yingyong Qi | A Dynamic Algorithm for Blind Separation of Convolutive Sound Mixtures | 22 pages, 9 figures | null | null | null | math.ST math.NA stat.CO stat.TH | null | We study an efficient dynamic blind source separation algorithm of
convolutive sound mixtures based on updating statistical information in the
frequency domain, andminimizing the support of time domain demixing filters by
a weighted least square method. The permutation and scaling indeterminacies of
separation, and concatenations of signals in adjacent time frames are resolved
with optimization of $l^1 \times l^\infty$ norm on cross-correlation
coefficients at multiple time lags. The algorithm is a direct method without
iterations, and is adaptive to the environment. Computations on recorded and
synthetic mixtures of speech and music signals show excellent performance.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:39:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Liu",
"Jie",
""
],
[
"Xin",
"Jack",
""
],
[
"Qi",
"Yingyong",
""
]
] |
0704.1362 | J.H. van Hateren | J. H. van Hateren | Fast recursive filters for simulating nonlinear dynamic systems | 20 pages, 8 figures, 1 table. A comparison with 4th-order Runge-Kutta
integration shows that the new algorithm is 1-2 orders of magnitude faster.
The paper is in press now at Neural Computation | Neural Computation 20:1821-1846 (2008) | null | null | q-bio.QM q-bio.NC | null | A fast and accurate computational scheme for simulating nonlinear dynamic
systems is presented. The scheme assumes that the system can be represented by
a combination of components of only two different types: first-order low-pass
filters and static nonlinearities. The parameters of these filters and
nonlinearities may depend on system variables, and the topology of the system
may be complex, including feedback. Several examples taken from neuroscience
are given: phototransduction, photopigment bleaching, and spike generation
according to the Hodgkin-Huxley equations. The scheme uses two slightly
different forms of autoregressive filters, with an implicit delay of zero for
feedforward control and an implicit delay of half a sample distance for
feedback control. On a fairly complex model of the macaque retinal horizontal
cell it computes, for a given level of accuracy, 1-2 orders of magnitude faster
than 4th-order Runge-Kutta. The computational scheme has minimal memory
requirements, and is also suited for computation on a stream processor, such as
a GPU (Graphical Processing Unit).
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:48:11 GMT"
},
{
"version": "v2",
"created": "Thu, 30 Aug 2007 07:50:06 GMT"
}
] | 2008-06-20T00:00:00 | [
[
"van Hateren",
"J. H.",
""
]
] |
0704.1363 | Mohamed Boucetta | M. Boucetta | Spectra and symmetric eigentensors of the Lichnerowicz Laplacian on
$S^n$ | 21 pages | null | null | null | math.DG math-ph math.MP | null | We compute the eigenvalues with multiplicities of the Lichnerowicz Laplacian
acting on the space of symmetric covariant tensor fields on the Euclidian
sphere $S^n$. The spaces of symmetric eigentensors are explicitly given.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:49:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Boucetta",
"M.",
""
]
] |
0704.1364 | Gracjan Maciejewski | G. Maciejewski, A. Niedzielski | CCD BV survey of 42 open clusters | 13 pages, 8 figures | null | 10.1051/0004-6361:20066588 | null | astro-ph | null | We present results of a photometric survey whose aim was to derive structural
and astrophysical parameters for 42 open clusters. While our sample is
definitively not representative of the total open cluster sample in the Galaxy,
it does cover a wide range of cluster parameters and is uniform enough to allow
for simple statistical considerations. BV wide-field CCD photometry was
obtained for open clusters for which photometric, structural, and dynamical
evolution parameters were determined. The limiting and core radii were
determined by analyzing radial density profiles. The ages, reddenings, and
distances were obtained from the solar metallicity isochrone fitting. The mass
function was used to study the dynamical state of the systems, mass segregation
effect and to estimate the total mass and number of cluster members. This study
reports on the first determination of basic parameters for 11 out of 42
observed open clusters. The angular sizes for the majority of the observed
clusters appear to be several times larger than the catalogue data indicate.
The core and limiting cluster radii are correlated and the latter parameter is
3.2 times larger on average. The limiting radius increases with the cluster's
mass, and both the limiting and core radii decrease in the course of dynamical
evolution. For dynamically not advanced clusters, the mass function slope is
similar to the universal IMF slope. For more evolved systems, the effect of
evaporation of low-mass members is clearly visible. The initial mass
segregation is present in all the observed young clusters, whereas the
dynamical mass segregation appears in clusters older than about log(age)=8.
Low-mass stars are deficient in the cores of clusters older than log(age)=8.5
and not younger than one relaxation time.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:52:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Maciejewski",
"G.",
""
],
[
"Niedzielski",
"A.",
""
]
] |
0704.1365 | Buric Nikola | Nikola Buric | Geometry and Dynamics of Quantum State Diffusion | null | null | 10.1088/1751-8113/40/22/012 | null | quant-ph | null | Riemannian metric on real 2n-dimensional space associated with the equation
governing complex diffusion of pure states of an open quantum system is
introduced and studied. Examples of a qubit under the influence of dephasing
and thermal environments are used to show that the curvature of the diffusion
metric is a good indicator of the properties of the environment dominated
evolution and its stability.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 07:53:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Buric",
"Nikola",
""
]
] |
0704.1366 | Simon D. H\"ugelmeyer | S. D. Huegelmeyer (1), S. Dreizler (1), D. Homeier (1), A. Reiners
(1,2) ((1) Institut fuer Astrophysik, Universitaet Goettingen, Germany, (2)
Hamburger Sternwarte, Universitaet Hamburg, Germany) | Investigation of transit-selected exoplanet candidates from the MACHO
survey | 6 pages, 3 figures, 1 table, accepted for publication in A&A | null | 10.1051/0004-6361:20077147 | null | astro-ph | null | Context: Planets outside our solar system transiting their host star, i. e.
those with an orbital inclination near 90 degree, are of special interest to
derive physical properties of extrasolar planets. With the knowledge of the
host star's physical parameters, the planetary radius can be determined.
Combined with spectroscopic observations the mass and therefore the density can
be derived from Doppler-measurements. Depending on the brightness of the host
star, additional information, e. g. about the spin-orbit alignment between the
host star and planetary orbit, can be obtained.
Aims: The last few years have witnessed a growing success of transit surveys.
Among other surveys, the MACHO project provided nine potential transiting
planets, several of them with relatively bright parent stars. The photometric
signature of a transit event is, however, insufficient to confirm the planetary
nature of the faint companion. The aim of this paper therefore is a
determination of the spectroscopic parameters of the host stars as well as a
dynamical mass determination through Doppler-measurements.
Methods: We have obtained follow-up high-resolution spectra for five stars
selected from the MACHO sample, which are consistent with transits of
low-luminosity objects. Radial velocities have been determined by means of
cross-correlation with model spectra. The MACHO light curves have been compared
to simulations based on the physical parameters of the system derived from the
radial velocities and spectral analyses.
Aims: We show that all transit light curves of the exoplanet candidates
analysed in this work can be explained by eclipses of stellar objects, hence
none of the five transiting objects is a planet.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:24:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Huegelmeyer",
"S. D.",
""
],
[
"Dreizler",
"S.",
""
],
[
"Homeier",
"D.",
""
],
[
"Reiners",
"A.",
""
]
] |
0704.1367 | Flaminio Flamini | Flaminio Flamini, Andreas Leopold Knutsen, Gianluca Pacienza, Edoardo
Sernesi | On families of rational curves in the Hilbert square of a surface (with
an Appendix by Edoardo Sernesi) | Submitted preprint. Paper 1: On families of rational curves in the
Hilbert square of a surface (with an Appendix by Edoardo Sernesi). Authors:
Flaminio Flamini, Andreas Leopold Knutsen and Gianluca Pacienza. Pages: 1 --
34. Figures: 1. Paper 2: Partial desingularizations of families of nodal
curves. Author: Edoardo Sernesi. Pages: 35--37 | null | null | null | math.AG | null | Under natural hypotheses we give an upper bound on the dimension of families
of singular curves with hyperelliptic normalizations on a surface S with p_g(S)
>0 via the study of the associated families of rational curves in Hilb^2(S).
We use this result to prove the existence of nodal curves of geometric genus
3 with hyperelliptic normalizations, on a general K3 surface, thus obtaining
specific 2-dimensional families of rational curves in its Hilbert square. We
describe two infinite series of examples of general, primitively polarized K3's
such that their Hilbert squares contain a IP^2 or a threefold birational to a
IP^1-bundle over a K3.
We discuss some consequences on the Mori cone of the Hilbert square of a
general K3.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:29:44 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Flamini",
"Flaminio",
""
],
[
"Knutsen",
"Andreas Leopold",
""
],
[
"Pacienza",
"Gianluca",
""
],
[
"Sernesi",
"Edoardo",
""
]
] |
0704.1368 | Chang Chi Kwong | Chang Chi Kwong and Ye Yeo | Anisotropy and Magnetic Field Effects on the Genuine Multipartite
Entanglement of Multi-Qubit Heisenberg {\it XY} Chains | 21 pages, 4 figures | null | null | null | quant-ph | null | It has been shown that, for the two-qubit Heisenberg XY model, anisotropy and
magnetic field may together be used to produce entanglement for any finite
temperature by adjusting the external magnetic field beyond some finite
critical strength. This interesting result arises from an analysis employing
the Wootters concurrence, a computable measure of entanglement for two-qubit
states. Recently, Mintert {\em et al.} proposed generalizations of Wootters
concurrence for multipartite states. These MKB concurrences possess a
mathematical property that enables one to understand the origin of this
characteristic behavior. Here, we first study the effect of anisotropy and
magnetic field on the multipartite thermal entanglement of a four-qubit
Heisenberg XY chain using the MKB concurrences. We show that this model
exhibits characteristic behavior similar to that of the two-qubit model. In
addition, we show that this can again be understood using the same mathematical
property. Next, we show that the six-qubit Heisenberg XY chain possesses
properties necessary for it to have the characteristic behavior too. Most
importantly, it is possible to directly measure the multipartite MKB
concurrences of pure states. This may provide an experimental verification of
our conjecture that for a Heisenberg XY chain of any even number of qubits, it
is always possible to obtain non-zero genuine multipartite entanglement at any
finite temperature by applying a sufficiently large magnetic field.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:11:39 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 06:45:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kwong",
"Chang Chi",
""
],
[
"Yeo",
"Ye",
""
]
] |
0704.1369 | Kazuya Aoki | K. Aoki (for the PHENIX Collaboration) | Double Helicity Asymmetry of Inclusive pi0 Production in Polarized pp
Collisions at sqrt(s)=62.4GeV | 4 pages, 3 figures, to be published in the Proceedings of the 17th
International Spin Physics Symposium (SPIN2006), Kyoto (Japan), October 2-7,
2006 | AIPConf.Proc.915:339-342,2007 | 10.1063/1.2750791 | null | hep-ex | null | The proton spin structure is not understood yet and there has remained large
uncertainty on Delta g, the gluon spin contribution to the proton. Double
helicity asymmetry (A_LL) of pi0 production in polarized pp collisions is used
to constrain Delta g. In this report, preliminary results of A_LL of pi0 in pp
collisions at sqrt(s) = 62.4 GeV measured by PHENIX experiment in 2006 is
presented. It can probe higer x region than the previously reported pi0 A_LL at
sqrt(s) = 200 GeV thanks to the lower center of mass energy.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:14:05 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Aoki",
"K.",
"",
"for the PHENIX Collaboration"
]
] |
0704.1370 | Ethem Akturk | O. Ozcan, E. Akturk and R. Sever | Time dependence of joint entropy of oscillating quantum systems | 18 pages, 8 figures | null | 10.1007/s10773-008-9756-4 | null | quant-ph | null | The time dependent entropy (or Leipnik's entropy) of harmonic and damped
harmonic oscillators is extensively investigated by using time dependent wave
function obtained by the Feynman path integral method. Our results for simple
harmonic oscillator are in agrement with the literature. However, the joint
entropy of damped harmonic oscillator shows remarkable discontinuity with time
for certain values of damping factor. According to the results, the envelop of
the joint entropy curve increases with time monotonically. This results is the
general properties of the envelop of the joint entropy curve for quantum
systems.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:17:29 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Sep 2007 09:16:04 GMT"
},
{
"version": "v3",
"created": "Sun, 23 Sep 2007 10:03:56 GMT"
}
] | 2012-12-24T00:00:00 | [
[
"Ozcan",
"O.",
""
],
[
"Akturk",
"E.",
""
],
[
"Sever",
"R.",
""
]
] |
0704.1371 | J\'er\^ome Lodewyck | Jerome Lodewyck and Philippe Grangier | Tight bound on coherent states quantum key distribution with heterodyne
detection | 8 pages, 3 figures | Phys. Rev. A 76, 022332 (2007) | 10.1103/PhysRevA.76.022332 | null | quant-ph | null | We propose a new upper bound for the eavesdropper's information in the direct
and reverse reconciliated coherent states quantum key distribution protocols
with heterodyne detection. This bound is derived by maximizing the leaked
information over the symplectic group of transformations that spans every
physical Gaussian attack on individual pulses. We exhibit four different
attacks that reach this bound, which shows that this bound is tight. Finally,
we compare the secret key rate obtained with this new bound to the homodyne
rate.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:21:14 GMT"
}
] | 2009-02-17T00:00:00 | [
[
"Lodewyck",
"Jerome",
""
],
[
"Grangier",
"Philippe",
""
]
] |
0704.1372 | Seick Kim | Seick Kim | Gaussian estimates for fundamental solutions of second order parabolic
systems with time-independent coefficients | null | Trans. Amer. Math. Soc. 360 (2008), 6031-6043. | 10.1090/S0002-9947-08-04485-1 | null | math.AP | null | Auscher, McIntosh and Tchamitchian studied the heat kernels of second order
elliptic operators in divergence form with complex bounded measurable
coefficients on $\mathbb{R}^n$. In particular, in the case when $n=2$ they
obtained Gaussian upper bound estimates for the heat kernel without imposing
further assumption on the coefficients. We study the fundamental solutions of
the systems of second order parabolic equations in the divergence form with
bounded, measurable, time-independent coefficients, and extend their results to
the systems of parabolic equations.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:33:59 GMT"
}
] | 2008-07-22T00:00:00 | [
[
"Kim",
"Seick",
""
]
] |
0704.1373 | Burgy Laurent | Burgy Laurent (INRIA Futurs), Laurent R\'eveill\`ere (INRIA Futurs),
Julia Lawall (DIKU), Gilles Muller (INRIA Rennes) | A Language-Based Approach for Improving the Robustness of Network
Application Protocol Implementations | null | null | null | null | cs.PL | null | The secure and robust functioning of a network relies on the defect-free
implementation of network applications. As network protocols have become
increasingly complex, however, hand-writing network message processing code has
become increasingly error-prone. In this paper, we present a domain-specific
language, Zebu, for describing protocol message formats and related processing
constraints. From a Zebu specification, a compiler automatically generates
stubs to be used by an application to parse network messages. Zebu is easy to
use, as it builds on notations used in RFCs to describe protocol grammars. Zebu
is also efficient, as the memory usage is tailored to application needs and
message fragments can be specified to be processed on demand. Finally,
Zebu-based applications are robust, as the Zebu compiler automatically checks
specification consistency and generates parsing stubs that include validation
of the message structure. Using a mutation analysis in the context of SIP and
RTSP, we show that Zebu significantly improves application robustness.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:35:32 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Laurent",
"Burgy",
"",
"INRIA Futurs"
],
[
"Réveillère",
"Laurent",
"",
"INRIA Futurs"
],
[
"Lawall",
"Julia",
"",
"DIKU"
],
[
"Muller",
"Gilles",
"",
"INRIA Rennes"
]
] |
0704.1374 | Richard I. Davies | R. Davies, F. Mueller Sanchez, R. Genzel, L. Tacconi, E. Hicks, S.
Friedrich, A. Sternberg | A Close Look at Star Formation around Active Galactic Nuclei | 51 pages, including 27 figures; accepted by ApJ (paper reorganised,
but results & conclusions the same) | null | 10.1086/523032 | null | astro-ph | null | We analyse star formation in the nuclei of 9 Seyfert galaxies at spatial
resolutions down to 0.085arcsec, corresponding to length scales of less than
10pc in some objects. Our data were taken mostly with the near infrared
adaptive optics integral field spectrograph SINFONI. The stellar light profiles
typically have size scales of a few tens of parsecs. In two cases there is
unambiguous kinematic evidence for stellar disks on these scales. In the
nuclear regions there appear to have been recent - but no longer active -
starbursts in the last 10-300Myr. The stellar luminosity is less than a few
percent of the AGN in the central 10pc, whereas on kiloparsec scales the
luminosities are comparable. The surface stellar luminosity density follows a
similar trend in all the objects, increasing steadily at smaller radii up to
10^{13}L_sun/kpc^2 in the central few parsecs, where the mass surface density
exceeds 10^4M_sun/pc^2. The intense starbursts were probably Eddington limited
and hence inevitably short-lived, implying that the starbursts occur in
multiple short bursts. The data hint at a delay of 50--100Myr between the onset
of star formation and subsequent fuelling of the black hole. We discuss whether
this may be a consequence of the role that stellar ejecta could play in
fuelling the black hole. While a significant mass is ejected by OB winds and
supernovae, their high velocity means that very little of it can be accreted.
On the other hand winds from AGB stars ultimately dominate the total mass loss,
and they can also be accreted very efficiently because of their slow speeds.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:39:56 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Aug 2007 20:23:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Davies",
"R.",
""
],
[
"Sanchez",
"F. Mueller",
""
],
[
"Genzel",
"R.",
""
],
[
"Tacconi",
"L.",
""
],
[
"Hicks",
"E.",
""
],
[
"Friedrich",
"S.",
""
],
[
"Sternberg",
"A.",
""
]
] |
0704.1375 | Yukihiro Ota | Yukihiro Ota, Motoyuki Yoshida, Ichiro Ohba | Decrease of entanglement by local operations in the D\"ur-Cirac method | 5 pages | null | null | WU-HEP-07-03 | quant-ph | null | One cannot always obtain information about entanglement by the D\"ur-Cirac
(DC) method. The impracticality is attributed to the decrease of entanglement
by local operations in the DC method. We show that, even in 2--qubit systems,
there exist states whose entangled property the DC method never evaluates. The
class of such states in 2--qubit systems is completely characterized by the
value of the fully entangled fraction. Actually, a state whose fully entangled
fraction is less than or equal to 1/2 is always transformed into a separable
state by local operations in the DC method, even if it has negative partial
transposition.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:18:51 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ota",
"Yukihiro",
""
],
[
"Yoshida",
"Motoyuki",
""
],
[
"Ohba",
"Ichiro",
""
]
] |
0704.1376 | Roberto Gilli | R. Gilli (INAF-OAB), A. Comastri (INAF-OAB), C. Vignali (Dip.
Astronomia, UniBo), G. Hasinger (MPE) | Compton-thick AGN and the Synthesis of the Cosmic X-ray Background: the
Suzaku Perspective | proceedings of "The Extreme Universe in the Suzaku Era", Kyoto 4-8
December 2006, to be published in Progress of Theoretical Physics, Supplement | null | 10.1143/PTPS.169.286 | null | astro-ph | null | We discuss the abundance of Compton-thick AGN as estimated by the most recent
population synthesis models of the cosmic X-ray background. Only a small
fraction of these elusive objects have been detected so far, in line with the
model expectations. The advances expected by the broad band detectors on board
Suzaku are briefly reviewed.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 08:55:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gilli",
"R.",
"",
"INAF-OAB"
],
[
"Comastri",
"A.",
"",
"INAF-OAB"
],
[
"Vignali",
"C.",
"",
"Dip.\n Astronomia, UniBo"
],
[
"Hasinger",
"G.",
"",
"MPE"
]
] |
0704.1377 | Hiroki Saito | Hiroki Saito, Yuki Kawaguchi, and Masahito Ueda | Kibble-Zurek mechanism in a quenched ferromagnetic Bose-Einstein
condensate | 11 pages, 7 figures | Phys. Rev. A 76, 043613 (2007) | 10.1103/PhysRevA.76.043613 | null | cond-mat.other | null | The spin vortices are shown to be created through the Kibble-Zurek (KZ)
mechanism in a quantum phase transition of a spin-1 ferromagnetic Bose-Einstein
condensate, when the applied magnetic field is quenched below a critical value.
It is shown that the magnetic correlation functions have finite correlation
lengths, and magnetizations at widely separated positions grow in random
directions, resulting in spin vortices. We numerically confirm the scaling law
that the winding number of spin vortices is proportional to the square root of
the length of the closed path, and for slow quench, proportional to $\tau_{\rm
Q}^{-1/6}$ with $\tau_{\rm Q}$ being the quench time. The relation between the
spin conservation and the KZ mechanism is discussed.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:05:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Saito",
"Hiroki",
""
],
[
"Kawaguchi",
"Yuki",
""
],
[
"Ueda",
"Masahito",
""
]
] |
0704.1378 | Fernando Muro | Fernando Muro, Stefan Schwede, Neil Strickland | Triangulated categories without models | 10 pages | Inventiones Mathematicae, Vol. 170 (2007), No. 2, pp. 231-241 | 10.1007/s00222-007-0061-2 | null | math.AT math.CT math.KT | null | We exhibit examples of triangulated categories which are neither the stable
category of a Frobenius category nor a full triangulated subcategory of the
homotopy category of a stable model category. Even more drastically, our
examples do not admit any non-trivial exact functors to or from these algebraic
respectively topological triangulated categories.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:08:03 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 23:59:59 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Muro",
"Fernando",
""
],
[
"Schwede",
"Stefan",
""
],
[
"Strickland",
"Neil",
""
]
] |
0704.1379 | Michael Mayer | Wei Lao, Michael Mayer | U-max-Statistics | 16 pages | null | null | null | math.ST math.PR stat.TH | null | In 1948, W. Hoeffding introduced a large class of unbiased estimators called
U-statistics, defined as the average value of a real-valued k-variate function
h calculated at all possible sets of k points from a random sample. In the
present paper we investigate the corresponding extreme value analogue, which we
shall call U-max-statistics. We are concerned with the behavior of the largest
value of such function h instead of its average. Examples of U-max-statistics
are the diameter or the largest scalar product within a random sample.
U-max-statistics of higher degrees are given by triameters and other metric
invariants.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:21:20 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lao",
"Wei",
""
],
[
"Mayer",
"Michael",
""
]
] |
0704.1380 | Yuhei Miyauchi | Yuhei Miyauchi, Riichiro Saito, Kentaro Sato, Yutaka Ohno, Shinya
Iwasaki, Takashi Mizutani, Jie Jiang, Shigeo Maruyama | Dependence of exciton transition energy of single-walled carbon
nanotubes on surrounding dielectric materials | 5pages, 4 figures | null | 10.1016/j.cplett.2007.06.018 | null | cond-mat.mtrl-sci | null | We theoretically investigate the dependence of exciton transition energies on
dielectric constant of surrounding materials. We make a simple model for the
relation between dielectric constant of environment and a static dielectric
constant describing the effects of electrons in core states, $\sigma$ bonds and
surrounding materials. Although the model is very simple, calculated results
well reproduce experimental transition energy dependence on dielectric constant
of various surrounding materials.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:23:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Miyauchi",
"Yuhei",
""
],
[
"Saito",
"Riichiro",
""
],
[
"Sato",
"Kentaro",
""
],
[
"Ohno",
"Yutaka",
""
],
[
"Iwasaki",
"Shinya",
""
],
[
"Mizutani",
"Takashi",
""
],
[
"Jiang",
"Jie",
""
],
[
"Maruyama",
"Shigeo",
""
]
] |
0704.1381 | Salvatore Esposito | S. Esposito, R. De Risi, L. Somma | Mpemba effect and phase transitions in the adiabatic cooling of water
before freezing | revtex, 4 pages, 2 figures | null | 10.1016/j.physa.2007.10.029 | DSF-11/2007 | physics.chem-ph physics.atm-clus physics.gen-ph | null | An accurate experimental investigation on the Mpemba effect (that is, the
freezing of initially hot water before cold one) is carried out, showing that
in the adiabatic cooling of water a relevant role is played by supercooling as
well as by phase transitions taking place at 6 +/- 1 oC, 3.5 +/- 0.5 oC and 1.3
+/- 0.6 oC, respectively. The last transition, occurring with a non negligible
probability of 0.21, has not been detected earlier. Supported by the
experimental results achieved, a thorough theoretical analysis of supercooling
and such phase transitions, which are interpreted in terms of different
ordering of clusters of molecules in water, is given.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:26:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Esposito",
"S.",
""
],
[
"De Risi",
"R.",
""
],
[
"Somma",
"L.",
""
]
] |
0704.1382 | Laura Rebuzzini | Laura Rebuzzini, Roberto Artuso, Shmuel Fishman and Italo Guarneri | Effects of atomic interactions on Quantum Accelerator Modes | 4 pages, 6 figures | Phys. Rev. A 76, 031603(R) (2007) | 10.1103/PhysRevA.76.031603 | null | nlin.CD quant-ph | null | We consider the influence of the inclusion of interatomic interactions on the
delta-kicked accelerator model. Our analysis concerns in particular quantum
accelerator modes, namely quantum ballistic transport near quantal resonances.
The atomic interaction is modelled by a Gross-Pitaevskii cubic nonlinearity,
and we address both attractive (focusing) and repulsive (defocusing) cases. The
most remarkable effect is enhancement or damping of the accelerator modes,
depending on the sign of the nonlinear parameter. We provide arguments showing
that the effect persists beyond mean-field description, and lies within the
experimentally accessible parameter range.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:39:45 GMT"
}
] | 2007-09-27T00:00:00 | [
[
"Rebuzzini",
"Laura",
""
],
[
"Artuso",
"Roberto",
""
],
[
"Fishman",
"Shmuel",
""
],
[
"Guarneri",
"Italo",
""
]
] |
0704.1383 | Mariusz Dabrowski P. | Mariusz P. Dabrowski, Tomasz Denkiewicz and Martin A. Hendry | How far is it to a sudden future singularity of pressure? | REVTEX4, 4 pages, 2 figures, references changed | Phys.Rev.D75:123524,2007 | 10.1103/PhysRevD.75.123524 | null | astro-ph gr-qc hep-th | null | We discuss the constraints coming from current observations of type Ia
supernovae on cosmological models which allow sudden future singularities of
pressure (with the scale factor and the energy density regular). We show that
such a sudden singularity may happen in the very near future (e.g. within ten
million years) and its prediction at the present moment of cosmic evolution
cannot be distinguished, with current observational data, from the prediction
given by the standard quintessence scenario of future evolution. Fortunately,
sudden future singularities are characterized by a momentary peak of infinite
tidal forces only; there is no geodesic incompletness which means that the
evolution of the universe may eventually be continued throughout until another
``more serious'' singularity such as Big-Crunch or Big-Rip.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:40:25 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Apr 2007 14:18:02 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Dabrowski",
"Mariusz P.",
""
],
[
"Denkiewicz",
"Tomasz",
""
],
[
"Hendry",
"Martin A.",
""
]
] |
0704.1384 | Luis Felipe Tabera | Tomas Recio, J. Rafael Sendra, Luis Felipe Tabera, Carlos Villarino | Generalizing circles over algebraic extensions | 31 pages, 1 figure | Math. Comp. 79 (2010), 1067-1089 | 10.1090/S0025-5718-09-02284-4 | null | math.AG | null | This paper deals with a family of spatial rational curves that were
introduced by Andradas, Recio and Sendra, under the name of hypercircles, as an
algorithmic cornerstone tool in the context of improving the rational
parametrization (simplifying the coefficients of the rational functions, when
possible) of algebraic varieties. A real circle can be defined as the image of
the real axis under a Moebius transformation in the complex field. Likewise,
and roughly speaking, a hypercircle can be defined as the image of a line ("the
${\mathbb{K}}$-axis") in a $n$-degree finite algebraic extension
$\mathbb{K}(\alpha)\thickapprox\mathbb{K}^n$ under the transformation
$\frac{at+b}{ct+d}:\mathbb{K}(\alpha)\to\mathbb{K}(\alpha)$.
The aim of this article is to extend, to the case of hypercircles, some of
the specific properties of circles. We show that hypercircles are precisely,
via $\mathbb{K}$-projective transformations, the rational normal curve of a
suitable degree. We also obtain a complete description of the points at
infinity of these curves (generalizing the cyclic structure at infinity of
circles). We characterize hypercircles as those curves of degree equal to the
dimension of the ambient affine space and with infinitely many
${\mathbb{K}}$-rational points, passing through these points at infinity.
Moreover, we give explicit formulae for the parametrization and implicitation
of hypercircles. Besides the intrinsic interest of this very special family of
curves, the understanding of its properties has a direct application to the
simplification of parametrizations problem, as shown in the last section.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:49:43 GMT"
}
] | 2014-01-27T00:00:00 | [
[
"Recio",
"Tomas",
""
],
[
"Sendra",
"J. Rafael",
""
],
[
"Tabera",
"Luis Felipe",
""
],
[
"Villarino",
"Carlos",
""
]
] |
0704.1385 | Paluba Waldemar | Waldemar Paluba | Decreasing families of dynamically determined intervals in the power-law
family | null | null | null | null | math.DS | null | We study the rate of growth of ratios of intervals delimited by the
post-critical orbit of a map in the quasi-quadratic family $x\mapsto
-|x|^\alpha +a.$ The critical order $\alpha$ is an arbitrary real number
$\alpha>1.$ The range of the parameter $a$ is confined to an interval
$(1,a_{\alpha})$ of length depending on the critical order. We prove that in
every power-law family there is a unique parameter $p_{\alpha}$ corresponding
to the kneading sequence $RLRRRLRC.$ Subsequently, we obtain monotonicity
results concerning ratios of all intervals labeled by infinite post-critical
orbit in the case of the kneading sequence $RLRL...$ This extends the results
from \cite{P}, via refinement of the tools based on special properties of
power-law mappings in non-euclidean metric.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:54:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Paluba",
"Waldemar",
""
]
] |
0704.1386 | Yuval Weiss | Yuval Weiss, Moshe Goldstein and Richard Berkovits | Disorder effect on the Friedel oscillations in a one-dimensional Mott
insulator | 5 pages, 5 figures | Phys. Rev. B 76, 24204 (2007) | 10.1103/PhysRevB.76.024204 | null | cond-mat.mes-hall cond-mat.dis-nn cond-mat.str-el | null | The Friedel oscillations resulting from coupling a quantum dot to one edge of
a disordered one-dimensional wire in the Mott insulator regime, are calculated
numerically using the DMRG method. By investigating the influence of the
disorder on the Friedel oscillations decay we find that the effect of disorder
is reduced by increasing the interaction strength. This behavior is opposite to
the recently reported influence of disorder in the Anderson insulator regime,
where disorder led to a stronger decay of the Friedel oscillations.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 09:58:24 GMT"
}
] | 2008-03-26T00:00:00 | [
[
"Weiss",
"Yuval",
""
],
[
"Goldstein",
"Moshe",
""
],
[
"Berkovits",
"Richard",
""
]
] |
0704.1387 | Alexey Bogomazov | V.M. Lipunov, K.A. Postnov, M.E. Prokhorov, A.I. Bogomazov | Description of the Scenario Machine | 32 pages, 3 figures. Corrected typos | Astronomy Reports, v. 53, no. 10, p. 915 (2009) | 10.1134/S1063772909100047 | null | astro-ph | null | We present here an updated description of the "Scenario Machine" code. This
tool is used to carry out a population synthesis of binary stars. Previous
version of the description can be found at
http://xray.sai.msu.ru/~mystery//articles/review/contents.html
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 10:08:06 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Sep 2007 14:22:11 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Lipunov",
"V. M.",
""
],
[
"Postnov",
"K. A.",
""
],
[
"Prokhorov",
"M. E.",
""
],
[
"Bogomazov",
"A. I.",
""
]
] |
0704.1388 | Philip Evans | P. A. Evans (Keele University and University of Leicester) and Coel
Hellier (Keele University) | Why do some intermediate polars show soft X-ray emission? A survey of
XMM-Newton spectra | 9 pages, 6 figures. Accepted for publication in ApJ | Astrophys.J.663:1277-1284,2007 | 10.1086/518552 | null | astro-ph | null | We make a systematic analysis of the XMM-Newton X-ray spectra of intermediate
polars (IPs) and find that, contrary to the traditional picture, most show a
soft blackbody component. We compare the results with those from AM Her stars
and deduce that the blackbody emission arises from reprocessing of hard X-rays,
rather than from the blobby accretion sometimes seen in AM Hers. Whether an IP
shows a blackbody component appears to depend primarily on geometric factors: a
blackbody is not seen in those that have accretion footprints that are always
obscured by accretion curtains or are only visible when foreshortened on the
white-dwarf limb. Thus we argue against previous suggestions that the blackbody
emission characterises a separate sub-group of IPs which are more akin to AM
Hers, and develop a unified picture of the blackbody emission in these stars.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 10:11:33 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Evans",
"P. A.",
"",
"Keele University and University of Leicester"
],
[
"Hellier",
"Coel",
"",
"Keele University"
]
] |
0704.1389 | Michele Fabrizio | Michele Fabrizio (SISSA and ICTP, Trieste, Italy) | Gutzwiller description of non-magnetic Mott insulators: a dimer lattice
model | 15 pages, 9 figures | null | 10.1103/PhysRevB.76.165110 | null | cond-mat.str-el | null | We introduce a novel extension of the Gutzwiller variational wavefunction
able to deal with insulators that escape any mean-field like description, as
for instance non-magnetic insulators. As an application, we study the Mott
transition from a paramagnetic metal into a non-magnetic Peierls, or
valence-bond, Mott insulator. We analyze this model by means of our Gutzwiller
wavefunction analytically in the limit of large coordination lattices, where we
find that: (1) the Mott transition is first order; (2) the Peierls gap is large
in the Mott insulator, although it is mainly contributed by the electron
repulsion; (3) singlet-superconductivity arises around the transition.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 10:18:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fabrizio",
"Michele",
"",
"SISSA and ICTP, Trieste, Italy"
]
] |
0704.1390 | Azam Gholami | Azam Gholami, Martin Falcke, Erwin Frey | Velocity oscillations in actin-based motility | 5 pages, 6 figures | null | 10.1088/1367-2630/10/3/033022 | HMI 18779, LMU-ASC 18/07 | q-bio.CB | null | We present a simple and generic theoretical description of actin-based
motility, where polymerization of filaments maintains propulsion. The dynamics
is driven by polymerization kinetics at the filaments' free ends, crosslinking
of the actin network, attachment and detachment of filaments to the obstacle
interfaces and entropic forces. We show that spontaneous oscillations in the
velocity emerge in a broad range of parameter values, and compare our findings
with experiments.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 10:49:47 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Gholami",
"Azam",
""
],
[
"Falcke",
"Martin",
""
],
[
"Frey",
"Erwin",
""
]
] |
0704.1391 | David S. Dean | D.S. Dean and R.R. Horgan | Path integrals for stiff polymers applied to membrane physics | 11 pages RevTex, 4 figures | Phys. Rev. E 76, 041102 (2007) | 10.1103/PhysRevE.76.041102 | null | cond-mat.soft | null | Path integrals similar to those describing stiff polymers arise in the
Helfrich model for membranes. We show how these types of path integrals can be
evaluated and apply our results to study the thermodynamics of a minority
stripe phase in a bulk membrane. The fluctuation induced contribution to the
line tension between the stripe and the bulk phase is computed, as well as the
effective interaction between the two phases in the tensionless case where the
two phases have differing bending rigidities.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 10:50:22 GMT"
}
] | 2009-01-27T00:00:00 | [
[
"Dean",
"D. S.",
""
],
[
"Horgan",
"R. R.",
""
]
] |
0704.1392 | James Libby | J.F. Libby (on behalf of the LHCb Collaboration) | Measuring CP violation in Bs->phi phi with LHCb | Presented at the CKM2006, 4th International Workshop on the CKM
Unitarity Triangle | null | null | null | hep-ph | null | Sensitivity studies to the CP-violating parameters of the decay Bs->phi phi
with the LHCb experiment are presented. The decay proceeds via a b->s s anti-s
gluonic-penguin quark transition, which is sensitive to contributions from
beyond the Standard Model particles. A time-dependent angular analysis of
simulated data leads to an expected statistical uncertainty of 6 degrees on any
new physics induced CP-violating phase for a sample corresponding to 2 fb^{-1}
of integrated luminosity. The expected precision on sin2beta from the related
decay Bd->phi K0S is also discussed.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 10:53:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Libby",
"J. F.",
"",
"on behalf of the LHCb Collaboration"
]
] |
0704.1393 | Barbara Lanzoni | B. Lanzoni (1,2), N. Sanna (3), F.R. Ferraro (1), E. Valenti (4), G.
Beccari (2,5,6), R.P. Schiavon (7), R.T. Rood (7), M. Mapelli (8), S.
Sigurdsson (9) - (1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3
Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della
Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy
Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical
Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State
University) | A Panchromatic Study of the Globular Cluster NGC 1904. I: The Blue
Straggler Population | ApJ accepted | Astrophys.J.663:1040-1048,2007 | 10.1086/518688 | null | astro-ph | null | By combining high-resolution (HST-WFPC2) and wide-field ground based (2.2m
ESO-WFI) and space (GALEX) observations, we have collected a multi-wavelength
photometric data base (ranging from the far UV to the near infrared) of the
galactic globular cluster NGC1904 (M79). The sample covers the entire cluster
extension, from the very central regions up to the tidal radius. In the present
paper such a data set is used to study the BSS population and its radial
distribution. A total number of 39 bright ($m_{218}\le 19.5$) BSS has been
detected, and they have been found to be highly segregated in the cluster core.
No significant upturn in the BSS frequency has been observed in the outskirts
of NGC 1904, in contrast to other clusters (M 3, 47 Tuc, NGC 6752, M 5) studied
with the same technique. Such evidences, coupled with the large radius of
avoidance estimated for NGC 1904 ($r_{avoid}\sim 30$ core radii), indicate that
the vast majority of the cluster heavy stars (binaries) has already sunk to the
core. Accordingly, extensive dynamical simulations suggest that BSS formed by
mass transfer activity in primordial binaries evolving in isolation in the
cluster outskirts represent only a negligible (0--10%) fraction of the overall
population.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 10:58:10 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Lanzoni",
"B.",
"",
"1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3\n Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della\n Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy\n Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical\n Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State\n University"
],
[
"Sanna",
"N.",
"",
"1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3\n Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della\n Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy\n Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical\n Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State\n University"
],
[
"Ferraro",
"F. R.",
"",
"1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3\n Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della\n Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy\n Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical\n Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State\n University"
],
[
"Valenti",
"E.",
"",
"1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3\n Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della\n Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy\n Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical\n Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State\n University"
],
[
"Beccari",
"G.",
"",
"1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3\n Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della\n Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy\n Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical\n Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State\n University"
],
[
"Schiavon",
"R. P.",
"",
"1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3\n Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della\n Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy\n Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical\n Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State\n University"
],
[
"Rood",
"R. T.",
"",
"1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3\n Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della\n Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy\n Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical\n Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State\n University"
],
[
"Mapelli",
"M.",
"",
"1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3\n Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della\n Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy\n Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical\n Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State\n University"
],
[
"Sigurdsson",
"S.",
"",
"1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3\n Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della\n Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy\n Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical\n Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State\n University"
],
[
"-",
"",
"",
"1 Dip. Astro., Bologna; 2 INAF--Oss. Astro., Bologna; 3\n Dip. Fisica, Roma Tor Vergata; 4 ESO-Chile; 5 Dip. Scienze della\n Comunicazione, Teramo; 6 INAF--Oss. Astro. Collurania, Teramo; 7 Astronomy\n Dep., University of Virginia; 8 Univ. of Zurich, Institute for Theoretical\n Physics; 9 Dep. of Astronomy and Astrophysics, The Pennsylvania State\n University"
]
] |
0704.1394 | Tarik Had\v{z}i\'c | Tarik Hadzic, Rune Moller Jensen, Henrik Reif Andersen | Calculating Valid Domains for BDD-Based Interactive Configuration | null | null | null | null | cs.AI | null | In these notes we formally describe the functionality of Calculating Valid
Domains from the BDD representing the solution space of valid configurations.
The formalization is largely based on the CLab configuration framework.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 10:59:56 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hadzic",
"Tarik",
""
],
[
"Jensen",
"Rune Moller",
""
],
[
"Andersen",
"Henrik Reif",
""
]
] |
0704.1395 | Shaaban Khalil | W. Emam and S. Khalil | Higgs and Z' Phenomenology in B-L extension of the Standard Model at LHC | 16 pages | Eur.Phys.J.C55:625-633,2007 | 10.1140/epjc/s10052-007-0411-7 | null | hep-ph | null | The phenomenology of the low scale U(1)_{B-L} extension of the standard model
and its implications at LHC is presented. In this model, an extra gauge boson
corresponding to B-L gauge symmetry and an extra SM singlet scalar (heavy
Higgs) are predicted. We show a detailed analysis of both heavy and light
Higgses decay and production in addition to the possible decay channels of the
new gauge boson. We find that the cross sections of the SM-like Higgs
production are reduced by ~ 20%-30%, while its decay branching ratios remain
intact. The extra Higgs has relatively small cross sections and the branching
ratios of Z'-> l^+ l^- are of order ~20% compared to ~ 3% of the SM resuls.
Hence, the search for Z' is accessible via a clean dilepton signal at LHC.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 11:21:37 GMT"
}
] | 2010-11-03T00:00:00 | [
[
"Emam",
"W.",
""
],
[
"Khalil",
"S.",
""
]
] |
0704.1396 | Eric Bonnet | Eric Bonnet (IPNO, GANIL), Francesca Gulminelli (LPCC), Bernard
Borderie (IPNO), Nicolas Le Neindre (IPNO), Marie-France Rivet (IPNO) | What Can be Learned Studying the Distribution of the Biggest Fragment ? | 8 pages | Proceedings of the XLV international winter meeting on nuclear
physics (2007) 1 | null | null | nucl-ex | null | In the canonical formalism of statistical physics, a signature of a first
order phase transition for finite systems is the bimodal distribution of an
order parameter. Previous thermodynamical studies of nuclear sources produced
in heavy-ion collisions provide information which support the existence of a
phase transition in those finite nuclear systems. Some results suggest that the
observable Z1 (charge of the biggest fragment) can be considered as a reliable
order parameter of the transition. This talk will show how from peripheral
collisions studied with the INDRA detector at GSI we can obtain this bimodal
behaviour of Z1. Getting rid of the entrance channel effects and under the
constraint of an equiprobable distribution of excitation energy (E*), we use
the canonical description of a phase transition to link this bimodal behaviour
with the residual convexity of the entropy. Theoretical (with and without phase
transition) and experimental Z1-E* correlations are compared. This comparison
allows us to rule out the case without transition. Moreover that quantitative
comparison provides us with information about the coexistence region in the
Z1-E* plane which is in good agreement with that obtained with the signal of
abnormal uctuations of configurational energy (microcanonical negative heat
capacity).
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 11:30:35 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bonnet",
"Eric",
"",
"IPNO, GANIL"
],
[
"Gulminelli",
"Francesca",
"",
"LPCC"
],
[
"Borderie",
"Bernard",
"",
"IPNO"
],
[
"Neindre",
"Nicolas Le",
"",
"IPNO"
],
[
"Rivet",
"Marie-France",
"",
"IPNO"
]
] |
0704.1397 | Taekyun Kim | Mehmet Cenkci | The p-adic generalized twisted (h,q)-euler-l-function and its
applications | 11 pages | null | null | null | math.NT | null | The purpose of this paper is to construct the p-adic twisted
(h,q)-Euler-l-function, which interpolates the twisted generalized twisted
Euler numbers attached to chi at a negative integer.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 11:32:57 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cenkci",
"Mehmet",
""
]
] |
0704.1398 | Istvan Ballai Dr | Istvan Ballai | Global coronal seismology | null | null | 10.1007/s11207-007-0415-3 | null | astro-ph | null | Following the observation and analysis of large-scale coronal wave-like
disturbances, we discuss the theoretical progress made in the field of global
coronal seismology. Using simple mathematical techniques we determine average
values for magnetic field together with a magnetic map of the quiet Sun. The
interaction between global coronal waves and coronal loops allows us to study
loop oscillations in a much wider context, i.e. we connect global and local
coronal oscillations.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 11:35:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ballai",
"Istvan",
""
]
] |
0704.1399 | Ludovic Dan Lemle | Ludovic Dan Lemle (FIH) | La formule de Lie-Trotter pour les semi-groupes fortement continus | 136 pages | Memoire de recherche no.8/2003, l'Institut Girard Desargues, CNRS
UMR5028, Lyon (05/2003) | null | null | math.FA | null | In this research project we presents the general properties, the spectral
properties and the representation formulas for $C_0$-semigroups of linear
operators in Banach spaces
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 11:35:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lemle",
"Ludovic Dan",
"",
"FIH"
]
] |
0704.1400 | Bomee Lee | Bomee Lee, Jounghun Lee (Seoul National Univ.) | Reconstructing the Intrinsic Triaxial Shape of the Virgo Cluster | submitted to ApJ, 16 page, 3 figures | null | null | null | astro-ph | null | To use galaxy clusters as a cosmological probe, it is important to account
for their triaxiality. Assuming that the triaxial shapes of galaxy clusters are
induced by the tidal interaction with the surrounding matter, Lee and Kang
recently developed a reconstruction algorithm for the measurement of the axial
ratio of a triaxial cluster. We examine the validity of this reconstruction
algorithm by performing an observational test of it with the Virgo cluster as a
target. We first modify the LK06 algorithm by incorporating the two dimensional
projection effect. Then, we analyze the 1275 member galaxies from the Virgo
Cluster Catalogue and find the projected direction of the Virgo cluster major
axis by measuring the anisotropy in the spatial distribution of the member
galaxies in the two dimensional projected plane. Applying the modified
reconstruction algorithm to the analyzed data, we find that the axial ratio of
the triaxial Virgo cluster is (1: 0.54 : 0.73). This result is consistent with
the recent observational report from the Virgo Cluster Survey, proving the
robustness of the reconstruction algorithm. It is also found that at the inner
radii the shape tends to be more like prolate. We discuss the possible effect
of the Virgo cluster triaxiality on the mass estimation.
| [
{
"version": "v1",
"created": "Wed, 11 Apr 2007 11:43:03 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lee",
"Bomee",
"",
"Seoul National Univ."
],
[
"Lee",
"Jounghun",
"",
"Seoul National Univ."
]
] |
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