# Accretion of perfect fluids onto a class of regular black holes

## TL;DR

This paper investigates how perfect fluids accrete onto regular black holes with quantum corrections, revealing that the core's properties can either hinder or enhance fluid infall, impacting black hole growth and cosmological models.

## Contribution

It demonstrates that regular black holes with de Sitter cores alter accretion dynamics compared to Schwarzschild black holes, with implications for black hole evolution and cyclic cosmologies.

## Key findings

- Accretion rates differ from Schwarzschild black holes.
- De Sitter cores can act as antigravitational sources or enhancers.
- Black hole mass constraints can inform cyclic universe models.

## Abstract

We consider the stationary spherical accretion process of perfect fluids onto a class of spherically symmetric regular black holes corresponding to quantum-corrected Schwarzschild spacetimes. We show that the accretion rates can differ from the Schwarzschild case, suggesting that the de Sitter core inside these regular black holes, which indeed precludes the central singularity, can act for some cases as a sort of antigravitational source, decreasing the fluid's radial infall velocity in the accretion process, and for others as a gravitational enhancer, increasing the fluid flow into the black hole horizon. Our analysis and results can be extended and also applied to the problem of black hole evaporation in cosmological scenarios with phantom fluids. In particular, we show that the mass of typical regular black holes can be used in order to constrain turnaround events in cyclic cosmologies.