On the double copy for spinning matter

YF Bautista, A Guevara - Journal of High Energy Physics, 2021 - Springer
A bstract We explore various tree-level double copy constructions for amplitudes including
massive particles with spin. By working in general dimensions, we use that particles with …

Weak Gravitational lensing by phantom black holes and phantom wormholes using the Gauss–Bonnet theorem

A Övgün, G Gyulchev, K Jusufi - Annals of Physics, 2019 - Elsevier
In this paper, we study the deflection of light by a class of phantom black hole and wormhole
solutions in the weak limit approximation. More specifically, in the first part of this work we …

Instability of Reissner–Nordström black hole in Einstein-Maxwell-scalar theory

YS Myung, DC Zou - The European Physical Journal C, 2019 - Springer
Abstract The scalarization of Reissner–Nordström black holes was recently proposed in the
Einstein-Maxwell-scalar theory. Here, we show that the appearance of the scalarized …

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 …

Null geodesics and shadow of hairy black holes in Einstein-Maxwell-dilaton gravity

M Heydari-Fard, M Heydari-Fard, HR Sepangi - Physical Review D, 2022 - APS
The timelike and null-like geodesics around compact objects are some of the best tools to
classify and understand the structure of a space-time. We study the null geodesics around …

Hairy black holes, scalar charges and extended thermodynamics

R Ballesteros, T Ortín - Classical and Quantum Gravity, 2024 - iopscience.iop.org
We explore the use of the recently defined scalar charge which satisfies a Gauss law in
stationary spacetimes, in the context of theories with a scalar potential. We find new …

On scalar charges and black hole thermodynamics

R Ballesteros, C Gómez-Fayrén, T Ortín… - Journal of High Energy …, 2023 - Springer
A bstract We revisit the first law of black hole thermodynamics in 4-dimensional theories
containing scalar and Abelian vector fields coupled to gravity using Wald's formalism and a …

Analytic and asymptotically flat hairy (ultra-compact) black-hole solutions and their axial perturbations

A Bakopoulos, T Nakas - Journal of High Energy Physics, 2022 - Springer
A bstract In this work, we consider a very simple gravitational theory that contains a scalar
field with its kinetic and potential terms minimally coupled to gravity, while the scalar field is …

Quasinormal modes of dilatonic Reissner–Nordström black holes

JL Blázquez-Salcedo, S Kahlen, J Kunz - The European Physical Journal …, 2019 - Springer
We calculate the quasinormal modes of static spherically symmetric dilatonic Reissner–
Nordström black holes for general values of the electric charge and of the dilaton coupling …