307 citations · 1k across the 27 of their papers we have counts for
30 papers
Tidal Properties of White Dwarfs Admixed with Fermionic Dark Matter
G. A. Carvalho, J. D. V. Arbañil, I. A. Lacerda +1
This study investigates the impact of fermionic dark matter (DM) on the structural and tidal properties of white dwarfs (WDs). Using a two-fluid general relativistic framework, we…
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…
Dark Matter in White Dwarfs: Implications for Their Structure
Sílvia P. Nunes, José D. V. Arbañil, Juan M. Z. Pretel +1
White Dwarfs (WDs), the final evolutionary stage of most stars, are frequently modeled considering only a dense plasma matter. However, their potential interaction with dark matter…
Examining the influence of anisotropy on the fundamental mode of nonradial oscillation in neutron stars on a complete general relativistic scheme
José D. V. Arbañil, Gabriel O. Cavalheiro, Victor B. T. Alves +3
The anisotropic influence on the -mode frequency of oscillations and dimensionless tidal deformability of neutron stars is analyzed by employing the nonradial oscillation equati…
Effects of light-mass fermionic dark matter on the equilibrium and stability of white dwarfs
G. A. Carvalho, J. D. V. Arbañil, J. G. Coelho
White dwarfs (WDs) can be used as laboratories to test strong gravity and high-density regimes, once their equation of state is not so uncertain as the one of neutron stars. This m…
Exploring Temperature Influences on Gravitational Wave Production in Binary White Dwarfs
Sílvia P. Nunes, José D. V. Arbañil, César H. Lenzi +1
This study investigates the conditions under which gravitational waves (GWs) are emitted during the merger of hot white dwarfs (WDs) in a binary system. Traditionally, these system…
Dark energy effects on realistic neutron stars
Juan M. Z. Pretel, Sergio B. Duarte, José D. V. Arbañil +2
By considering realistic equations of state (EoSs) to describe the ordinary matter of the stellar crust, in this study, we explore the effect of a dark energy core, made of Chaplyg…
Gravitational wave seismology of charged strange stars in the Cowling approximation: the fluid pulsation modes
José D. V. Arbañil, César H. Lenzi, Juan M. Z. Pretel +1
In this work we study, within the framework of Cowling approximation, the effect of the electric charge on the gravitational wave frequency of fluid oscillation modes of strange qu…
Gravitational wave asteroseismology of dark matter hadronic stars
C. V. Flores, C. H. Lenzi, M. Dutra +2
The influence of the dark matter mass~() and the Fermi momentum~($k_{F}^{\dm}$) on the -mode oscillation frequency, damping time parameter, and tidal deformability of had…
Compact stars in scalar-tensor theories with a single-well potential and the corresponding theory
Juan M. Z. Pretel, Sergio E. Jorás, Ribamar R. R. Reis +2
The macroscopic properties of compact stars in modified gravity theories can be significantly different from the general relativistic (GR) predictions. Within the gravitational con…
Fluid pulsation modes and tidal deformability of anisotropic strange stars in light of the GW event
José D. V. Arbañil, Cesar V. Flores, César H. Lenzi +1
The effects of the anisotropy on the fluid pulsation modes adopting the so-called Cowling approximation and tidal deformability of strange quark stars are investigated by using the…
Phase transition and stiffer core fluid in neutron stars: Effects on stellar configurations, dynamical stability, and tidal deformability
José D. V. Arbañil, Lucas S. Rodrigues, César H. Lenzi
In this work, we investigate the influence of the phase transition and a stiffer fluid in neutron stars' cores on the static equilibrium configuration, dynamical stability, and tid…
Charged quark stars in metric gravity
Juan M. Z. Pretel, José D. V. Arbañil, Sergio B. Duarte +2
We provide the modified TOV equations for the hydrostatic equilibrium of charged compact stars within the metric gravitational background. We adopt the MIT bag model EoS for…
Tidal deformability and radial oscillations of anisotropic polytropic spheres
José D. V. Arbañil, Grigoris Panotopoulos
We compute the equilibrium, the fundamental eigenfrequency of oscillations modes, and quadrupolar tidal deformability of anisotropic polytropic spheres. These studies are respectiv…
The structure and stability of massive hot white dwarfs
Sílvia P. Nunes, José D. V. Arbañil, Manuel Malheiro
We investigate the structure and stability against radial oscillations, pycnonuclear reactions, and inverse -decay of hot white dwarfs. We regard that the fluid matter is made u…
Neutron stars in gravity with conserved energy-momentum tensor: Hydrostatic equilibrium and asteroseismology
Juan M. Z. Pretel, Sergio E. Jorás, Ribamar R. R. Reis +1
We investigate the equilibrium and radial stability of spherically symmetric relativistic stars, considering a polytropic equation of state (EoS), within the framework of …
Fluid pulsation modes from strange stars in a higher-dimensional space-time
José D. V. Arbañil, César H. Lenzi, Manuel Malheiro
In this work, we make the first step to derive non-radial pulsation equations in extra dimensions and investigate how the - and -mode frequencies of strange quark stars, wi…
Stable relativistic polytropic objects with cosmological constant
José D. V. Arbañil, Pedro H. R. S. Moraes
The effects of the cosmological constant on the static equilibrium configurations and stability against small radial perturbations of relativistic polytropic spheres are investigat…
Gravastar model in Randall-Sundrum braneworld
José D V Arbañil, Pedro H R S Moraes, Manuel Malheiro
In this work we derive a gravastar model in Randall-Sundrum II braneworld scenario. Gravastars (or gravitationally vacuum stars) were proposed by Mazur and Mottola as systems of gr…
Extra dimensions' influence on the equilibrium and radial stability of strange quark stars
José D. V. Arbañil, Geanderson A. Carvalho, Ronaldo V. Lobato +2
We analyze the influence of extra dimensions on the static equilibrium configurations and stability against radial perturbations. For this purpose, we solve stellar structure equat…
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…
White dwarfs with a surface electrical charge distribution: Equilibrium and stability
G. A. Carvalho, José D. V. Arbañil, R. M. Marinho +1
The equilibrium configuration and the radial stability of white dwarfs composed of charged perfect fluid are investigated. These cases are analyzed through the results obtained fro…
Relativistic polytropic spheres with electric charge: Compact stars, compactness and mass bounds, and quasiblack hole configurations
José D. V. Arbañil, Vilson T. Zanchin
We study the static stellar equilibrium configurations ofuncharged and charged spheres composed by a relativistic polytropic fluid, and compare with those of spheres composed by a…
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…