# Screening in perturbative approaches to LSS

## TL;DR

This paper discusses a semi-phenomenological approach to modeling screening mechanisms, especially Vainshtein screening, in large-scale structure formation to test modified gravity theories against observations.

## Contribution

It introduces a new semi-phenomenological method to incorporate screening effects in large-scale structure observables, focusing on Vainshtein screening mechanisms.

## Key findings

- Provides a framework for including screening in LSS analyses
- Enhances testing of modified gravity models against observational data
- Facilitates understanding of screening effects in quasi-linear regimes

## 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.