Conformal scalar NUT-like dyons in conformal electrodynamics

TL;DR

This paper constructs conformal scalar NUT-like dyon black holes in non-linear electrodynamics, analyzing their thermodynamics, gravitational effects, and photon shadows, revealing how nonlinearity influences ISCOs and shadows.

Contribution

It introduces a new class of conformally scalar NUT-like dyon black holes with duality symmetry in non-linear electrodynamics, including their thermodynamic and gravitational properties.

Findings

ISCO radii increase with NLE parameter for positive scalar charge.

Shadow sizes grow as electromagnetic nonlinearity increases.

Thermodynamic first law is formulated for these black holes.

Abstract

We construct conformally scalar NUTty dyon black holes in non-linear electrodynamics (NLE) which possess conformal and duality-rotation symmetries and are characterized by a free dimensionless parameter. The thermodynamic first law of the black hole is formulated. Then we explore the strong gravitational effects of the black hole, mainly focusing on the innermost stable circular orbits (ISCOs) of massive particles and shadows formed by the photons. One of our interesting results is that if the black hole is endowed with a positive real conformal scalar charge rendering it Reissner-Nordstr\"om-like, the radii of the ISCOs and the shadow both increase with the increasing NLE parameter signifying the increasing nonlinearity of the electromagnetic field.