Title: The fan beam model for the pulse evolution of PSR J0737-3039B,
Abstract: Average radio pulse profile of a pulsar B in a double pulsar system PSR
J0737-3039A/B exhibits an interesting behaviour. During the observation period
between 2003 and 2009, the profile evolves from a single-peaked to a
double-peaked form, following disappearance in 2008 indicating that the
geodetic precession of the pulsar is a possible origin of such behaviour. The
known pulsar beam models can be used to determine the geometry of PSR
J0737-3039B in the context of the precession. We study how the fan-beam
geometry performs in explaining the observed variations of the radio profile
morphology. It is shown that the fan beam can successfully reproduce the
observed evolution of the pulse width, and should be considered as a serious
alternative for the conal-like models.