# Assessing the impact of bulk and shear viscosities on large scale structure formation

## TL;DR

This paper investigates how bulk and shear viscosities influence large-scale structure formation in late-time cosmology, showing shear viscosity can significantly suppress perturbation growth and delay nonlinear development.

## Contribution

It provides a comparative analysis of bulk and shear viscosities' effects on cosmic perturbations and offers constraints based on statistical analysis.

## Key findings

- Shear viscosity can effectively suppress perturbation growth.
- Shear viscosity delays the onset of nonlinear structure formation.
- Constraints on viscous effects are derived from statistical analysis.

## Abstract

It is analyzed the effects of both bulk and shear viscosities on the perturbations, relevant for structure formation in late time cosmology. It is shown that shear viscosity can be as effective as the bulk viscosity on suppressing the growth of perturbations and delaying the nonlinear regime. A statistical analysis of the shear and bulk viscous effects is performed and some constraints on these viscous effects are given.