# Microstates of black holes in expanding universe from interacting branes

## TL;DR

This paper tests the p-soup model for black branes in an expanding universe, showing that gravitationally interacting branes can explain thermodynamic properties and microstates in such cosmological settings.

## Contribution

It extends the p-soup model to asymptotically FLRW black brane systems, demonstrating its effectiveness in describing their thermodynamics and microstates.

## Key findings

- Gravitationally interacting branes explain thermodynamic quantities.
- Microstates can be understood via the p-soup model.
- Supports the universality of the p-soup approach in cosmological backgrounds.

## Abstract

Thermodynamics of the near extremal black p-branes can be described by collective motions of gravitationally interacting branes. This proposal is called the p-soup model. In this paper, we check this proposal in the case of black brane system which is asymptotically Friedmann-Lemaitre-Robertson-Walker universe in an infinite distance. As a result, we can show that the gravitationally interacting branes explain free energy, entropy, temperature and other physical quantities in these systems. This implies that the microstates of this kind of brane system can be also understood in the p-soup model.