1 citations · 1 across the 31 of their papers we have counts for
35 papers
Dirac oscillator in a self-gravitating cosmic string: confinement spectra beyond the conical approximation
Edilberto O. Silva
The gravitational field of a physical cosmic string is regular on the axis, curved across a finite vortex core, and only asymptotically conical. We test whether the bound-state spe…
Circulation and operational sparsity of analogue Hawking radiation in rotating acoustic horizons
Fernando M. Belchior, Joao A. A. S. Reis, Edilberto O. Silva
Temporal sparsity compares the mean interval between emitted quanta with a characteristic single-quantum timescale. We study this operational quantity for the rotating draining-bat…
Electric and magnetic Penrose processes, charged-particle collisions and superradiance around a Lorentz-violating dyonic black hole
Fernando M. Belchior, Edilberto O. Silva
This paper is aimed at investigating electromagnetic energy extraction, charged-particle collisions, charged-field superradiance, and horizon stability in a Lorentz-violating dyoni…
Multipolar static tidal response of Schwarzschild black holes in cubic gravity: a metric-action derivation of tidal running
Edilberto O. Silva
Static tidal Love numbers of four-dimensional Schwarzschild black holes vanish in general relativity, whereas higher-curvature interactions can generate a nontrivial response. We i…
Geometry-induced Casimir response in a helicoidal spacetime
Edilberto O. Silva
We investigate the Casimir response of a massive scalar field in a torsionless helicoidal spacetime with Levi-Civita connection. The background is ultrastatic and curved, with scal…
Dirac oscillator in a helically twisted spacetime with axial torsion
Matheus D. Moro, Fabiano M. Andrade, Faizuddin Ahmed +1
We investigate the Dirac oscillator in a helically twisted spacetime endowed with a uniform axial torsion. Starting from an orthonormal coframe, we compute the Levi--Civita spin co…
Fixed-quadrupole static tidal response of Schwarzschild black holes in a cubic Weyl effective field theory
Edilberto O. Silva
Static Love numbers of four-dimensional Schwarzschild black holes vanish in general relativity. We study how the fixed-quadrupole static tidal solution is modified by the parity-ev…
Source-driven torsional optical activity in geometrically chiral media
Edilberto O. Silva
We develop an effective field-theoretical model for source-driven electromagnetic waves in a geometrically chiral optical medium described by a uniform axial torsion. Starting from…
Dark-Soliton Branch Blocking in Transonic Bose--Einstein Condensate Flows
Edilberto O. Silva
Acoustic horizons in Bose--Einstein condensates are usually characterized through long-wavelength Bogoliubov phonons. We study a nonlinear counterpart: whether a one-dimensional da…
Shadow, acoustic redshift, and transfer observables of Lorentz-violating rotating acoustic black holes
Fernando M. Belchior, Edilberto O. Silva
We develop an impact-parameter-resolved transfer analysis for the rotating acoustic black hole with Lorentz symmetry violation. The background is the -dimensional Lorentz-vi…
ModMax black hole surrounded by perfect-fluid dark matter in Lorentz-violating Kalb-Ramond gravity
Fernando M. Belchior, Faizuddin Ahmed, Edilberto O. Silva
We investigate a ModMax black hole surrounded by perfect-fluid dark matter within the framework of Lorentz-violating Kalb-Ramond gravity. The model combines three physically distin…
Transfer observables of rotating acoustic black holes from ray tracing: shadow centroid, redshift asymmetry and flux imbalance
Faizuddin Ahmed, Ahmad Al-Badawi, Fernando M. Belchior +1
We construct an impact-parameter-resolved transfer framework for null acoustic rays in the rotating draining-bathtub spacetime. The formalism separates the source-independent ray g…
Perturbations and greybody bounds of Euler-Heisenberg black holes surrounded by perfect fluid dark matter
Fernando M. Belchior, Faizuddin Ahmed, Edilberto O. Silva
We investigate the propagation of massless fields with spins , , and in the spacetime of an Euler-Heisenberg (EH) black hole surrounded by perfect fluid dark matt…
Hawking Temperature, Sparsity and Energy Emission Rate of Regular Black Holes Supported by Primordial Dark Matter
Faizuddin Ahmed, Ahmad Al-Badawi, Edilberto O. Silva
In this paper, we investigate the thermodynamic and radiative properties of a regular black hole sourced by primordial dark matter (PDM), modeled effectively through a Dirac--Born-…
Thermodynamic and Radiative Properties of Euler-Heisenberg AdS Black Holes Surrounded by Quintessence and Dark Matter with a Cloud of Strings
Faizuddin Ahmed, Edilberto O. Silva
We investigate the thermodynamics, criticality, and selected radiative and optical properties of an Euler-Heisenberg AdS black hole surrounded by quintessence, perfect fluid dark m…
Hawking Temperature, Sparsity and Energy Emission Rate of Dark Matter Halo Regular Black Holes
Faizuddin Ahmed, Edilberto O. Silva
In this paper, we investigate the thermodynamic and radiative properties of a regular black hole sourced by a dark matter halo described by the Einasto density profile. The closed-…
Shadow, Quasinormal Modes, Sparsity, and Energy Emission Rate of Euler-Heisenberg Black Hole Surrounded by Perfect Fluid Dark Matter
Edilberto O. Silva, Faizuddin Ahmed
In this work, we investigate the optical, dynamical, and radiative properties of an Euler--Heisenberg black hole immersed in a perfect fluid dark matter (PFDM) background. We analy…
Charged Black Holes in KR-gravity Surrounded by Perfect Fluid Dark Matter
Faizuddin Ahmed, Mohsen Fathi, Edilberto O. Silva
In this work, we systematically investigate the null geodesics of electrically charged black holes in a gravitational framework that incorporates Lorentz violation induced by a bac…
Charged Black Holes in Bumblebee gravity with Global Monopole: Thermodynamics and Shadow
Faizuddin Ahmed, Shubham Kala, Edilberto O. Silva
In this paper, we perform a detailed study of the thermodynamic properties of a charged black hole in bumblebee gravity in the presence of a global monopole. We also analyze the op…
Thermodynamic Analysis of Charged AdS Black Holes with Cloud of Strings in Einstein-Bumblebee Gravity via Tsallis Entropy
Faizuddin Ahmed, Edilberto O. Silva
We investigate the thermodynamic properties of charged anti-de Sitter black holes surrounded by a cloud of strings in bumblebee gravity. In this framework, the cloud-of-strings par…
Screened Simpson-Visser Black Holes with Asymptotically de-Sitter Core
Faizuddin Ahmed, Ahmad Al-Badawi, Edilberto O. Silva
In this work, we introduce a screened Simpson-Visser regular solution and perform a comprehensive study of its physical and observational properties. We begin by analyzing the ther…
Dyonic ModMax Black Holes in Kalb-Ramond gravity with a Cloud of Strings as Source
Faizuddin Ahmed, Edilberto O. Silva
We investigate the geodesic structure, shadow, thermodynamics, and Hawking radiation from a dyonic ModMax black hole in Kalb-Ramond gravity with a cloud of strings. The combined pr…
Accelerating Bertotti-Robinson Black Holes in a Uniform Magnetic Field
Ahmad Al-Badawi, Faizuddin Ahmed, Edilberto O. Silva
We study the Hawking temperature, geodesic motion, and observable signatures of the accelerating Bertotti-Robinson (BR) spacetime, a vacuum black-hole solution deformed by a unifor…
ModMax-AdS Black Hole with Global Monopole as Source in Kalb-Ramond Gravity
Faizuddin Ahmed, Ahmad Al-Badawi, Edilberto O. Silva
In this work, we investigate in detail the thermodynamic properties of a spherically symmetric ModMax-AdS black hole sourced by a global monopole within the Kalb-Ramond gravity. We…