# Nonlinearly charged dyonic black holes

## TL;DR

This paper explores the thermodynamics of nonlinearly charged dyonic black holes with Born-Infeld electromagnetic fields, revealing phase transitions, critical behavior, and the impact of nonlinearity on duality and cosmological effects.

## Contribution

It demonstrates how nonlinear electromagnetic fields influence black hole thermodynamics, phase structure, and duality, extending previous Maxwell-based solutions.

## Key findings

- Nonlinear fields cancel cosmological constant effects.
- Black holes exhibit critical behavior and multiple phases.
- Existence of triple points and reentrant phase transitions.

## Abstract

In this paper, we investigate the thermodynamics of dyonic black holes in the presence of Born-Infeld electromagnetic field. We show that electric-magnetic duality reported for dyonic solutions with Maxwell field is omitted in case of Born-Infeld generalization. We also confirm that generalization to nonlinear field provides the possibility of canceling the effects of cosmological constant. This is done for nonlinearity parameter with $10^{-33}\mbox{ eV}^{2}$ order of magnitude which is high nonlinearity regime. In addition, we show that for small electric/magnetic charge and high nonlinearity regime, black holes would develop critical behavior and several phases. In contrast, for highly charged case and Maxwell limits (small nonlinearity), black holes have one thermal stable phase. We also find that the pressure of the cold black holes is bounded by some constraints on its volume while hot black holes' pressure has physical behavior for any volume. In addition, we report on possibility of existences of triple point and reentrant of phase transition in thermodynamics of these black holes. Finally, We show that if electric and magnetic charges are identical, the behavior of our solutions would be Maxwell like (independent of nonlinear parameter and field). In other words, nonlinearity of electromagnetic field becomes evident only when these black holes are charged magnetically and electrically different.