307 citations · 1k across the 27 of their papers we have counts for
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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…
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…
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…
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…
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…
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…
Compact stars in the braneworld: a new branch of stellar configurations with arbitrarily large mass
Germán Lugones, José D. V. Arbañil
We study the properties of compact stars in the Randall-Sundrum II type braneworld model. To this end, we solve the braneworld generalization of the stellar structure equations for…
Stellar equilibrium configurations of compact stars in gravity
P. H. R. S. Moraes, José D. V. Arbañil, M. Malheiro
In this article we study the hydrostatic equilibrium configuration of neutron stars and strange stars, whose fluid pressure is computed from the equations of state and…
Incompressible relativistic spheres: Electrically charged stars, compactness bounds, and quasiblack hole configurations
José D. V. Arbañil, José P. S. Lemos, Vilson T. Zanchin
We investigate the properties of relativistic star spheres made of an electrically charged incompressible fluid, generalizing, thus, the Schwarzschild interior solution. The invest…
Polytropic spheres with electric charge: compact stars, the Oppenheimer-Volkoff and Buchdahl limits, and quasiblack holes
José D. V. Arbañil, José P. S. Lemos, Vilson T. Zanchin
We explore a class of compact charged spheres made of a charged perfect fluid with a polytropic equation of state. The charge density is chosen to be proportional to the energy den…