# Einstein-Born-Infeld gravastar models, dark matter and accretion mechanisms

## TL;DR

This paper develops regular Einstein-Born-Infeld gravastar models avoiding singularities, and analyzes accretion processes and mass change rates around these compact objects, offering insights into their physical properties.

## Contribution

It introduces truly regular gravastar models within Einstein-Born-Infeld electrodynamics and investigates their accretion dynamics and mass evolution.

## Key findings

- Constructed regular gravastar models with continuous metric and derivatives.
- Analyzed accretion rates and velocities for specific spherically symmetric configurations.
- Studied the mass change rate during accretion processes.

## Abstract

Gravastar models have recently been proposed as an alternative to black holes, mainly to avoid the pro\-ble\-ma\-tic issues associated with event horizons and singularities. In this work, a regular variety of gravastar models within the context of Einstein-Born-Infeld (EBI) nonlinear electrodynamics are builded. These models presented here are truly regular in the sense that both the metric and its derivatives are continuous throughout space-time, contrary to other cases in the literature where matching conditions are necessary in the interior and exterior regions of the event horizon. We investigated the accretion process for spherically symmetric space-time geometries generated for a nonlinear electromagnetic field where the energy momentum tensor have the same form that an anisotropic fluid that is the general EBI case. We analyse this procedure using the most general static spherically symmetric metric ansatz. In this theoretical context, we examined the accretion process for specific sphe\-ri\-ca\-lly symmetric compact configuration obtaining the accretion rates and the accretion velocities during the process and the flow of the fluid around the black hole. In addition, we study the behaviour of the rate of change of the mass for each chosen metric.