The bouncing cosmology with $F(R)$ gravity and its reconstructing

TL;DR

This paper explores a bouncing cosmology within $F(R)$ gravity, demonstrating how such models can resolve singularities, reproduce accelerated expansion, and remain stable at late times through detailed reconstruction and analysis.

Contribution

It introduces a reconstruction of $F(R)$ gravity based on the Hu-Sawicki model to realize bouncing cosmology with stability and accelerated expansion.

Findings

Bouncing behavior can solve non-singular problems in Big Bang cosmology.

Reconstructed models show accelerated expansion in the universe.

Stability analysis indicates late-time stability of the scenario.

Abstract

In this paper, we study $F(R)$ gravity by Hu-Sawicki model in Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) background. The Friedmann equations are calculated by modified gravity action, and then the obtained Friedmann equations are written in terms of standard Friedmann equations. Next behavior of bouncing cosmology is investigated in the modified gravity model, i.e., this behavior can solve problem of non-singular in standard Big Bang cosmology. We plot the cosmological parameters in terms of cosmic time and then bouncing condition is investigated. In what follows, we reconstruct the modified gravity by redshift parameter, and also graphs of cosmological parameters are plotted in terms of redshift, in which the figures show us an accelerated expansion of Universe. Finally, the stability of the scenario is investigated by a function as sound speed, and the graph of sound speed versus redshift show us that there is the stability in late time.