Spherical Collapse of a Unified Dark Fluid with Constant Adiabatic Sound Speed

TL;DR

This paper investigates how a unified dark fluid with constant adiabatic sound speed influences the formation of large-scale structures in the universe, revealing parameter-dependent variations in collapse timing.

Contribution

It introduces a model of a unified dark fluid with constant adiabatic sound speed and analyzes its impact on cosmic structure formation through spherical collapse simulations.

Findings

Higher values of parameters B_s and α accelerate structure formation

The model demonstrates parameter-dependent variations in collapse timing

Unified dark fluid influences large-scale structure development

Abstract

In this paper, we test the spherical collapse of a unified dark fluid (UDF) which has constant adiabatic sound speed. By choosing the different values of model parameters $B_s$ and $\alpha$, we show the nonlinear collapse for UDF and baryons which are considered for their formation of the large scale structure of our Universe. The analyzed results show that larger values of $\alpha$ and $B_s$ make the structure formation faster and earlier.