Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A

S Vagnozzi, R Roy, YD Tsai, L Visinelli… - … and Quantum Gravity, 2023 - iopscience.iop.org
Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …

Noncommutative Schwarzschild black hole surrounded by quintessence: Thermodynamics, Shadows and Quasinormal modes

B Hamil, BC Lütfüoğlu - Physics of the Dark Universe, 2024 - Elsevier
Abstract In Campos et al.(2022), Campos et al studied the quasinormal modes and shadows
of noncommutative Schwarzschild black holes. Since we know that the quintessence matter …

The shadows of quintessence non-singular black hole

HL Li, M Zhang, YM Huang - The European Physical Journal C, 2024 - Springer
Abstract In 2022, the Event Horizon Telescope (EHT) collaboration has reported the first
observations of Sagittarius A*(SgrA*). Applying the EHT observational results, we find out …

On dark energy effects on the accretion physics around a Kiselev spinning black hole

D Pugliese, Z Stuchlík - The European Physical Journal C, 2024 - Springer
Kiselev metric in the static and rotating form is widely used to test different aspects of the
dark energy (DE) effects. We consider a DE Kiselev spacetime, predicting the reduction to …

Black hole in a generalized Chaplygin–Jacobi dark fluid: Shadow and light deflection angle

M Fathi, JR Villanueva, G Aguilar-Pérez… - Physics of the Dark …, 2024 - Elsevier
We investigate a generalized Chaplygin-like gas with an anisotropic equation of state,
characterizing a dark fluid within which a static spherically symmetric black hole is assumed …

Effect of dark energy on photon orbits and thermodynamic phase transition for Hayward anti-de Sitter black holes

A Kumar, SG Ghosh, A Wang - Physics of the Dark Universe, 2024 - Elsevier
We investigate a black hole solution analogous to Hayward regular black holes with a
negative cosmological constant surrounded by quintessence—the Hayward–Kiselev anti-de …

Effects of dark energy on dynamic phase transition of charged AdS black holes

SQ Lan, JX Mo, GQ Li, XB Xu - Physical Review D, 2021 - APS
In a search for the effects of quintessence dark energy on the kinetics of black hole phase
transition, we investigate in detail the dynamic phase transition of charged anti–de Sitter …

Accelerated black holes in (2+ 1) dimensions: quasinormal modes and Stability

RDB Fontana, A Rincon - The European Physical Journal C, 2025 - Springer
We investigate the propagation of a scalar field in a\((2+ 1)\)-dimensional accelerated black
hole, recently revisited in Arenas-Henriquez et al.(J High Energy Phys https://doi …

Scalar field instabilities in charged BTZ black holes

RDB Fontana - Physical Review D, 2024 - APS
We investigate the charged scalar field propagating in a (2+ 1) charged Bañados-Teitelboim-
Zanelli black hole. The conditions for stability are studied unveiling, for each black hole …

Superradiance and instabilities in black holes surrounded by anisotropic fluids

B Cuadros-Melgar, RDB Fontana, J de Oliveira - Physical Review D, 2021 - APS
In this paper we analyze the propagation of a charged scalar field in a Reissner-Nordström
black hole endowed with one anisotropic fluid that can play the role of a cosmological term …