Presence of Dark Energy and Dark Matter : Does Cosmic Acceleration signifies a Weak Gravitational collapse?

TL;DR

This study investigates how dark energy and dark matter influence the gravitational collapse of a star in different gravity theories, revealing dark matter favors collapse while dark energy inhibits it, with implications for black hole formation.

Contribution

It compares the effects of dark energy and dark matter on stellar collapse in DGP brane and Loop Quantum gravity models, highlighting differences in black hole formation potential.

Findings

Dark matter favors collapse and black hole formation.

Dark energy reduces collapse likelihood due to negative pressure.

Collapse behavior varies significantly between the two gravity theories.

Abstract

In this work the collapsing process of a spherically symmetric star, made of dust cloud, in the background of dark energy is studied for two different gravity theories separately, i.e., DGP Brane gravity and Loop Quantum gravity. Two types of dark energy fluids, namely, Modified Chaplygin gas and Generalised Cosmic Chaplygin gas are considered for each model. Graphs are drawn to characterize the nature and the probable outcome of gravitational collapse. A comparative study is done between the collapsing process in the two different gravity theories. It is found that in case of dark matter, there is a great possibility of collapse and consequent formation of Black hole. In case of dark energy possibility of collapse is far lesser compared to the other cases, due to the large negative pressure of dark energy component. There is an increase in mass of the cloud in case of dark matter collapse due to matter accumulation. The mass decreases considerably in case of dark energy due to dark energy accretion on the cloud. In case of collapse with a combination of dark energy and dark matter, it is found that in the absence of interaction there is a far better possibility of formation of black hole in DGP brane model compared to Loop quantum cosmology model.