18 citations · 62 across the 25 of their papers we have counts for
28 papers
Five-dimensional thick branes in the scalar representation of gravity
F. C. E. Lima, F. M. Belchior, C. A. S. Almeida
One examines a codimension-one thick braneworld in the scalar representation of gravity, where is the nonmetricity scalar, and is the boundary term satisfying $R=Q…
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…
Gödel-type universes in Lorentz-violating Kalb-Ramond gravity with Ricci- and Riemann-tensor nonminimal couplings
Fernando M. Belchior
This paper studies homogeneous \Godel-type geometries in a gravitational model where local Lorentz symmetry is spontaneously broken by the vacuum expectation value of an antisymmet…
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…
Nonlocal four-fermion theory
F. M. Belchior, J. R. Nascimento, A. Yu. Petrov +1
In this work, we formulate and analyze a nonlocal four-fermion theory in which the usual Dirac operator is deformed by an entire nonlocal form factor. After introducing an auxiliar…
Nonlocal Rarita-Schwinger theory
Fernando M. Belchior, Roberto V. Maluf
In this paper, one constructs a nonlocal extension of the Rarita-Schwinger theory for spin- fermions. Two classes of analytic form factors are considered: scalar form factors…
One-loop contributions in Lorentz-violating scalar QED with nonminimal coupling
F. M. Belchior, J. R. Nascimento, A. Yu. Petrov +1
In the context of pertubative aspects of Lorentz-violating theories, we study the divergent one-loop two-point functions of a Lorentz-violating (LV) extension of scalar QED contain…
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…
Hairy Kiselev black hole with quintessential matter: themodynamic properties, sparsity of Hawking radiation, and greybody factors
Faizuddin Ahmed, Fernando M. Belchior, Allan R. P. Moreira +1
In this work, we investigate the thermodynamic properties, Hawking-radiation sparsity, and greybody-factor bounds of a hairy Kiselev black hole surrounded by a quintessential fluid…
Geodesics and Thermodynamics of a Schwarzschild Black Hole with Hernquist Dark Matter
A. R. P. Moreira, A. Bouzenada, F. M. Belchior +1
In this work, we investigate the physical and geometrical properties of a Schwarzschild black hole (BH) immersed in a Hernquist dark matter halo. To accomplish our purpose, one bui…
New mechanism for fermion localization in -brane
Allan R. P. Moreira, Fernando M. Belchior, Guo-Hua Sun +1
We investigate the localization of fermionic fields in a five-dimensional braneworld scenario within the framework of modified teleparallel gravity described by a general $f(T,T_G)…
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…
ModMax-black hole surrounded by cloud of strings in Bumblebee gravity
Fernando M. Belchior, Allan R. P. Moreira, Abdelmalek Bouzenada +1
In this article, we investigate the optical, thermodynamic, and scattering properties of a ModMax black hole surrounded by a cloud of strings within the framework of Einstein-bumbl…
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…
Thick branes and fermion localization in five-dimensional gravity
A. R. P. Moreira, F. M. Belchior, Shi-Hai Dong +1
We investigate thick-brane configurations in five-dimensional modified teleparallel gravity. In five dimensions, the torsional Gauss-Bonnet invariant contributes d…
Scattering, absorption and greybody factor of scalar particles by Lorentz-violating charged black holes
F. M. Belchior
In this work, we investigate the scattering and absorption of spin 0 particles for electrically charged black holes in two gravity models with spontaneous Lorentz symmetry breaking…
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…
Topological and self-dual vortices in a double sigma model with Maxwell coupling
Francisco C. E. Lima, Fernando M. Belchior, Allan R. P. Moreira
In this work, we construct a double O(3)-sigma model minimally coupled to a Maxwell field in (2+1)-dimensional spacetime and investigate the existence of self-dual magnetic vortex…
Duality in topologically massive models with term
Fernando M. Belchior, Roberto V. Maluf
This paper aims to investigate the classical duality between the -Maxwell-Kalb-Ramond (MKR) theory and a self-dual non-gauge-invariant model. First, we establish the equiva…
Fermionic greybody factors and strong gravitational lensing by Lorentz-violating global monopole
F. M. Belchior, R. V. Maluf, A. R. M. Oliveira +2
In this work, we study the greybody factors (GFs) of spin 1/2 and spin 3/2 fermions for a black hole with global monopole in self-interacting Kalb-Ramond gravity with Lorentz symme…
Global monopole in a Ricci-coupled Kalb-Ramond bumblebee gravity
F. M. Belchior, R. V. Maluf, A. Yu. Petrov +1
In this paper, we investigate black hole solutions in Einstein-Kalb-Ramond (EKR) bumblebee gravity sourced by a global monopole characterized by the charge . This modified theor…
Geometrical deformation of brane matter field within gravity
Fernando M. Belchior, Roberto V. Maluf, Albert Yu. Petrov +1
In the context of braneworld scenarios, the real scalar field plays a crucial role by providing thickness for brane. In this work, we investigate a codimension-one thick brane with…
On the asymmetric non-canonical braneworld in five dimensions
F. C. E. Lima, F. M. Belchior, C. A. S. Almeida +1
Revisiting Einstein's gravitational theory, we build a five-dimensional braneworld. Within this framework, one announces the appearance of symmetric and asymmetric domain walls. Fu…
On the singular position-dependent mass
F. C. E. Lima, F. M. Belchior, C. A. S. Almeida
Revisiting the issue associated with Position-Dependent Mass (PDM), we reaffirm that the appropriate framework for addressing a generic PDM is the symmetrization proposed by BenDan…