73 citations · 410 across the 26 of their papers we have counts for
26 papers
Shadow structure of generalized black-bounce metrics
Jose R. Nascimento, Ana R. M. Oliveira, Albert Yu. Petrov +2
The existence of black hole shadows is one of the most interesting effects of the strong field regime of general relativity (GR). Recent observations by the Event Horizon Telescope…
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…
A novel nonlocal spin-1/2 theory: classical and quantum aspects
J. R. Nascimento, Gonzalo J. Olmo, A. Yu. Petrov +2
We propose a novel nonlocal spin-1/2 theory in which the form factor depends on the Dirac operator rather than on the d'Alembert operator. In this scenario, we explore some classic…
Gravitational lensing by generalized black-bounce space-times
C. Furtado, A. L. A. Moreira, J. R. Nascimento +2
We study gravitational lensing by generalized black-bounce space-times both in regimes of weak and strong field approximations. These metrics interpolate between regular blac…
Rotation effects on the graphene wormhole energy levels
G. Q. Garcia, P. J. Porfírio, C. Furtado +1
In this work, we are interested in how spinning effects influence the electronic properties of the graphene wormhole. For this purpose, we have described the graphene by the wormho…
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…
Landau levels for massive disclinated graphene-based topological insulator
G. Q. Garcia, J. R. S. Oliveira, P. J. Porfírio +1
In this work, we investigate the massive Kane-Mele model for graphene in the presence of disclination and an external magnetic field, where graphene behaviors as a topological insu…
Kink solutions in nonlocal scalar field theory models
I. Andrade, R. Menezes, A. Yu. Petrov +1
In this paper, we study in detail various solutions, especially kink ones, in different nonlocal scalar field theories, whose kinetic term is described by an arbitrary non-polynomi…
Effects of non-commutative geometry on black hole properties
A. A. Araújo Filho, J. R. Nascimento, A. Yu. Petrov +2
In this study, we investigate the signatures of a non-commutative black hole solution. Initially, we calculate the thermodynamic properties of the system, including entropy, heat c…
Gravitational lensing by a Lorentz-violating black hole
A. A. Araújo Filho, J. R. Nascimento, A. Yu. Petrov +1
In this work, we study the gravitational lensing by a Lorentz-violating (LV) black hole inspired by the recent contribution [1]. Explicitly, we concentrate on a specific applicatio…
An exact stationary axisymmetric vacuum solution within a metric--affine bumblebee gravity
A. A. Araújo Filho, J. R. Nascimento, A. Yu. Petrov +1
Within the framework of the spontaneous Lorentz symmetry breaking, we consider a metric--affine generalization of the gravitational sector of the Standard--Model Extension (SME), i…
New brane-like solutions in modified four-dimensional Einstein-Gauss-Bonnet gravity
D. Bazeia, R. Menezes, A. Yu. Petrov +1
We investigate solutions of a new Einstein-Gauss-Bonnet gravity ( ). We first describe the bulk vacuum solution, then we add a massive probe scalar field, and we foll…
Braneworlds in bumblebee gravity
M. A. Marques, R. Menezes, A. Yu. Petrov +1
We investigate thick-brane solutions within the five-dimensional bumblebee gravity in the presence of a real scalar field. Specifically, we implement the Lorentz symmetry breaking…
Gravitational signatures of a non--commutative stable black hole
N. Heidari, H. Hassanabadi, A. A. Araújo Filho +3
This work investigates several key aspects of a non--commutative theory with mass deformation. We calculate thermodynamic properties of the system and compare our results with rece…
Comment on "A comment on metric vs metric-affine gravity"
Gonzalo J. Olmo, P. J. Porfírio
It has been recently claimed in [arXiv:2211.12327] that an action of the Einstein-Palatini form plus a torsionless Pontryagin term (multiplied by a constant) represents a counterex…
Thermodynamics and evaporation of a modified Schwarzschild black hole in a non--commutative gauge theory
A. A. Araújo Filho, S. Zare, P. J. Porfírio +2
In this work, we study the thermodynamic properties on a non--commutative background via gravitational gauge field potentials. This procedure is accomplished after contracting de S…
Vacuum solution within a metric-affine bumblebee gravity
A. A. Araújo Filho, J. R. Nascimento, A. Yu. Petrov +1
We consider a metric-affine extension to the gravitational sector of the Standard-Model Extension for the Lorentz-violating coefficients and . The general results, whic…
Induced gravitational topological term and the Einstein-Cartan modified theory
J. R. Nascimento, A. Yu. Petrov, P. J. Porfírio
It is well known that only the axial piece of the torsion couples minimally to fermions in a Riemann-Cartan geometry, while the other ones decouple. In this paper, we consider the…
On the causality properties in non-local gravity theories
J. R. Nascimento, A. Yu. Petrov, P. J. Porfírio
It is well known that non-local theories of gravity have been a flourish arena of studies for many reasons, for instance, the UV incompleteness of General Relativity (GR). In this…
Strong gravitational lensing in a spacetime with topological charge within the Eddington-inspired Born-Infeld gravity
C. Furtado, J. R. Nascimento, A. Yu. Petrov +2
In this work we calculate the angular deflection of light in the strong field limit in two spacetimes which were previously studied within the Eddington-inspired Born-Infeld gravit…
Gödel-type Solutions in Cubic Galileon Gravity
J. R. Nascimento, A. Yu. Petrov, P. Porfírio +1
We address the homogeneous in space and time (ST-homogeneous) Gödel-type metrics within the cubic galileon theory, a particular class of generalized galileon theories. We check the…
Graphene-based topological insulator in the presence of a disclination submitted to a uniform magnetic field
J. R. S. Oliveira, G. Q. Garcia, P. J. Porfírio +1
In this paper we investigate quasiparticles in graphene-based topological insulator with a wedge disclination in the presence of a uniform magnetic field. In particular, we conside…
Gaussian null coordinates, near-horizon geometry and conserved charges on the horizon of extremal non-dilatonic black -branes
Mirjam Cvetič, Paulo J. Porfírio, Alejandro Satz
In this paper, we examine the emergence of conserved charges on the horizon of a particular class of extremal non-dilatonic black -branes (which reduce to extremal dilatonic bla…
Nonlinear -models in the Eddington-inspired Born-Infeld Gravity
J. R. Nascimento, Gonzalo J. Olmo, P. J. Porfírio +2
In this paper we consider two different nonlinear -models minimally coupled to Eddington-inspired Born-Infeld gravity. We show that the resultant geometries represent minimal mo…