Regular compact objects with scalar hair

T Karakasis, NE Mavromatos, E Papantonopoulos - Physical Review D, 2023 - APS
We discuss exact regular compact object solutions in higher-dimensional extensions of
general relativity sourced by a phantom scalar field in arbitrary D spacetime dimensions (D> …

Black holes with scalar hair in three dimensions

T Karakasis, G Koutsoumbas, E Papantonopoulos - Physical Review D, 2023 - APS
Three-dimensional static and spinning black hole solutions of the Einstein-Klein-Gordon
system are obtained for a particular scalar field configuration. At large distances, and for a …

Exact black holes in string-inspired Euler-Heisenberg theory

A Bakopoulos, T Karakasis, NE Mavromatos, T Nakas… - Physical Review D, 2024 - APS
We consider higher-order derivative gauge field corrections that arise in the fundamental
context of dimensional reduction of string theory and Lovelock-inspired gravities and obtain …

Novel exact ultracompact and ultrasparse hairy black holes emanating from regular and phantom scalar fields

A Bakopoulos, T Nakas - Physical Review D, 2023 - APS
In the framework of a simple gravitational theory that contains a scalar field minimally
coupled to gravity, we investigate the emergence of analytic black-hole solutions with …

Compact objects with primary hair in shift and parity symmetric beyond Horndeski gravities

A Bakopoulos, N Chatzifotis, T Nakas - Physical Review D, 2024 - APS
In this work, we delve into the model of the shift symmetric and parity-preserving beyond
Horndeski theory in all its generality. We present an explicit algorithm to extract static and …

Magnetically charged Euler-Heisenberg black holes with scalar hair

T Karakasis, G Koutsoumbas, A Machattou… - Physical Review D, 2022 - APS
We study the Einstein-Euler-Heisenberg theory in the presence of a self interacting scalar
field, minimally coupled to gravity. We solve analytically the field equations for the …

Rotating ()-dimensional black holes in Einstein-Maxwell-dilaton theory

T Karakasis, E Papantonopoulos, ZY Tang, B Wang - Physical Review D, 2023 - APS
We consider Einstein-Maxwell-dilaton theory in (2+ 1) dimensions where the coupling
between the scalar field and the Maxwell invariant is the dilatonic coupling f (ϕ)= exp (-2 α …

Electromagnetic generalized quasitopological gravities in () dimensions

P Bueno, PA Cano, J Moreno, G van der Velde - Physical Review D, 2023 - APS
The construction of quasitopological gravities in three-dimensions requires coupling a scalar
field to the metric. As shown in [arXiv: 2104.10172], the resulting “electromagnetic” …

Corrected Thermodynamics of Black Hole Conformally Coupled to a Massless Scalar

HK Sudhanshu, S Upadhyay, DV Singh… - International Journal of …, 2022 - Springer
We study the corrected entropy due to thermal fluctuation and their effect on the
thermodynamics of a conformally dressed black hole in three dimensions. We find that the …

Anisotropic generalized polytropic spheres: Regular 3D black holes

SN Sajadi, M Khodadi, O Luongo… - Physics of the Dark …, 2024 - Elsevier
We model gravitating relativistic 3D spheres composed of an anisotropic fluid in which the
radial and transverse components of the pressure correspond to the vacuum energy and a …