125 citations · 145 across the 19 of their papers we have counts for
22 papers
Supercritical Branching Random Walks on Nested Lattices
Elena Yarovaya
In classical models of supercritical continuous-time branching random walks (BRWs) on a -dimensional lattice, the dimension is typically assumed to be fixed. When comparing…
Optical effects of one-sided Kiselev-type quintessence in reflection-asymmetric polymer thin-shell wormholes
Jonathan A. Rebouças, Edson Otoniel
Strong-field rays that traverse a wormhole can carry optical information about an exterior inaccessible to the observer. We investigate this mechanism in a reflection-asymmetric th…
Teleparallel torsion and white dwarf structure in \(f(T)=T+ΞT^2\) gravity
Edson Otoniel, Jonathan A. Reboucas, Iarley P. Lobo
We investigate how quadratic torsion modifies the equilibrium structure of white dwarfs in covariant gravity. Static spherical configurations are calculated with a fi…
Symmetric Thin-Shell Wormholes from a Regularized String-Cloud Black Hole: Energy Conditions, Multi-Fluid Stability, and Optical Signatures
Zijun Zhong, Jonathan A. Reboucas, Edson Otoniel +1
We construct a symmetric thin-shell wormhole from two copies of the positive-lapse exterior of a rationally regularized Letelier--Alencar string-cloud black hole with a finite-curv…
Thin-shell wormholes in cosmic voids
Jonathan A. Rebouças, Edson Otoniel, Francisco S. N. Lobo
Cosmic voids are underdense regions that can provide an effective large-scale environment with a de Sitter-like gravitational behavior. Motivated by recent black-hole solutions emb…
Bayesian constraints on quadratic gravity from the ADM mass of white dwarfs
Edson Otoniel, Lucas A. Souza, Jonathan A. Rebouças +1
We calculate static equilibrium sequences for white dwarfs (WDs) in quadratic symmetric teleparallel gravity, f(Q)=Q+alpha Q^2, and perform a Bayesian comparison between the negati…
Modified electron dispersion relations in degenerate white dwarfs
Edson Otoniel, Iarley P. Lobo
We investigate how modified electron dispersion relations affect the structure of cold white dwarfs (WDs). The deformation is introduced only in the degenerate electron equation of…
White Dwarf Stellar Structure from Effective Polymer Geometry in Loop Quantum Gravity
Edson Otoniel, Jonathan A. Rebouças, M. C. Araújo +1
We construct an effective Tolman Oppenheimer Volkoff system for cold carbon white dwarfs using the areal radius form of a polymer metric sector motivated by loop quantum gravity. T…
Junction Conditions, Radial Stability, Thermodynamics, Optical Geometry and Appearance of Polymer-Quintessence Thin-Shell Wormholes
Jonathan A. Rebouças, Edson Otoniel, M. C. Araújo +2
Thin-shell wormholes built from effective black hole geometries are sensitive not only to the lapse function but also to the choice of areal radius. We construct a reflection-symme…
Magnetic pressure anisotropy in ultra-dense white dwarfs: Landau quantization and neutronization effects
Edson Otoniel, Juan M. Z. Pretel, Victor B. T. Alves +2
Strong magnetic fields modify the thermodynamics of white dwarf (WD) matter by quantizing the transverse motion of degenerate electrons into Landau levels and splitting the pressur…
Localized magnetic pressure anisotropy in strange dwarfs with crystalline crusts
Mila Leite Garcia Reis, Daniela Eller Uliana, Jaziel G. Coelho +1
We study equilibrium sequences of magnetized strange dwarfs composed of a self bound MIT bag strange matter core, with \(B_{\rm bag}^{1/4}=145\,{\rm MeV}\), and an ordinary crystal…
Thin-Shell Wormholes from Entropy-Induced Black-Hole Geometries
Jonathan A. Rebouças, Edson Otoniel
Modified black-hole entropies can induce effective spacetime geometries and thereby provide a thermodynamic route for investigating thin-shell wormholes. In this work, we construct…
Double White Dwarf Mergers as Progenitors of Long-Period Transients
Manuel Malheiro, Sarah V. Borges, Jaziel G. Coelho +6
There is an ongoing discussion in the literature on the nature of long-period transients (LPTs), radio-emitting sources with periods ranging from hundreds to tens of thousands of s…
Rotating strange dwarfs and their indistinguishability from white dwarfs
Edson Otoniel, José D. V. Arbañil, Geanderson A. Carvalho +1
We investigate the structure of strange dwarfs, modeled as hybrid compact stars composed of a self bound strange quark matter core surrounded by a white dwarf like crust, within a…
Fermi Acceleration Mechanisms Beyond Lorentz Symmetry
Gilson A. Ferreira, Erick Aguiar, A. A. Araújo Filho +3
We construct models for first- and second-order Fermi acceleration of particles, incorporating generic frame transformations, dispersion relations, and conservation laws. Within th…
Quantum improved wormholes in the Dekel-Zhao dark matter halo
Jonathan A. Rebouças, Celio R. Muniz, Francisco Bento Lustosa +1
This work presents and investigates novel traversable wormhole solutions within the framework of Asymptotically Safe Gravity (ASG), sourced by a dark matter halo modeled by the Dek…
White dwarf structure in gravity: beyond the Chandrasekhar mass limit
Edson Otoniel, Juan M. Z. Pretel, Clésio E. Mota +3
In this work, we investigate the relativistic structure of white dwarfs (WDs) within the framework of modified gravity theory , which introduces a non-mi…
Prospects for the Observation of Continuous Gravitational Waves from Deformed Fast-spinning White Dwarfs
M. F. Sousa, E. Otoniel, J. G. Coelho +1
There has been a growing interest within the astrophysics community in highly magnetized and fast-spinning white dwarfs (WDs), commonly referred to as HMWDs. WDs with these charact…
Mass limits of the extremely fast-spinning white dwarf CTCV J2056-3014
Edson Otoniel, Jaziel G. Coelho, Sílvia P. Nunes +2
CTCV J2056--3014 is a nearby cataclysmic variable with an orbital period of approximately hours at a distance of about light-years from the Earth. Its recently reporte…
Compact Astrophysical Objects in gravity
P. H. R. S. Moraes, J. D. V. Arbañil, G. A. Carvalho +4
In this article we study the hydrostatic equilibrium configuration of neutron stars (NSs) and strange stars (SSs), whose fluid pressure is computed from the equations of state $p=ω…
Stellar equilibrium configurations of white dwarfs in the gravity
G. A. Carvalho, R. V. Lobato, P. H. R. S. Moraes +4
In this work we investigate the equilibrium configurations of white dwarfs in a modified gravity theory, na\-mely, gravity, for which and stand for the Ricci scala…
Very Magnetized White Dwarfs with Axisymmetric Magnetic Field and the Importance of the Electron Capture and Pycnonuclear Fusion Reactions for their Stability
Edson Otoniel, Bruno Franzon, Manuel Malheiro +2
In this work, we study the properties of magnetized white dwarfs taking into account possible instabilities due to electron capture and pycnonuclear fusion reactions in the cores o…