Title: Screening in perturbative approaches to LSS,
Abstract: A specific value for the cosmological constant, \Lambda, can account for
late-time cosmic acceleration. However, motivated by the so-called cosmological
constant problem(s), several alternative mechanisms have been explored. To
date, a host of well-studied dynamical dark energy and modified gravity models
exists. Going beyond \Lambda CDM often comes with additional degrees of freedom
(dofs). For these to pass existing observational tests, an efficient screening
mechanism must be in place. The linear and quasi-linear regimes of structure
formation are ideal probes of such dofs and can capture the onset of screening.
We propose here a semi-phenomenological treatment to account for screening
dynamics on LSS observables, with special emphasis on Vainshtein-type
screening.