256 citations · 1.7k across the 84 of their papers we have counts for
16 papers · 1 filter
Cosmological evolution with negative energy densities
A. A. Saharian, R. M. Avagyan, E. R. Bezerra de Mello +3
For general number of spatial dimensions we investigate the cosmological dynamics driven by a cosmological constant and by a source with barotropic equation of state. It is assumed…
Quantum Brownian motion for a particle in analog expanding cosmologies in the presence of disclination
E. J. B. Ferreira, E. R. Bezerra de Mello, H. F. Santana Mota
In this paper we study the quantum brownian motion of a scalar point particle in the analog Friedman-Robertson-Walker spacetime in the presence of a disclination, in a condensed ma…
Non-Abelian cosmic string in the Starobinsky model of gravity
J. P. Morais Graça, A. de Pádua Santos, Eugênio R. Bezerra de Mello +1
In this paper, we analyze numerically the behaviour of the solutions corresponding to a non-Abelian cosmic string in the framework of the Starobinsky model, i.e. where $f(R)=R + ζR…
Abelian cosmic string in the Starobinsky model of gravity
J. P. Morais Graça
In this paper, I analyze numerically the behaviour of the solutions corresponding to an Abelian string in the framework of the Starobinsky model. The role played by the quadratic t…
Non-Abelian cosmic strings in de Sitter and anti-de Sitter space
Antônio de Pádua Santos, Eugênio R. Bezerra de Mello
In this paper we investigate the non-Abelian cosmic string in de Sitter and anti-de Sitter spacetimes. In order to do that we construct the complete set of equations of motion cons…
One-loop effective potential in nonlocal scalar field models
F. Briscese, E. R. Bezerra de Mello, A. Yu. Petrov +1
In this paper we apply the usual perturbative methodology to evaluate the one-loop effective potential in a nonlocal scalar field theory. We find that the effect induced by the non…
Casimir effect in hemisphere capped tubes
E. R. Bezerra de Mello, A. A. Saharian
In this paper we investigate the vacuum densities for a massive scalar field with general curvature coupling in background of a (2+1)-dimensional spacetime corresponding to a cylin…
Abelian-Higgs strings in Rastall gravity
Eugenio R. Bezerra de Mello, Julio C. Fabris, Betti Hartmann
In this paper we analyze Abelian-Higgs strings in a phenomenological model that takes quantum effects in curved space-time into account. This model, first introduced by Rastall, ca…
On the motion of a test particle around a global monopole in a modified gravity
T. R. P. Caramês, E. R. Bezerra de Mello, M. E. X. Guimarães
In this paper we suggest an approach to analyse the motion of a test particle in the spacetime of a global monopole within a -like modified gravity. The field equations are w…
Gravitational Field of a Global Monopole in a Modified Gravity
T. R. P. Caramês, E. R. Bezerra de Mello, M. E. X. Guimarães
In this paper we analyze the gravitational field of a global monopole in the context of gravity. More precisely, we show that the field equations obtained are expressed in t…
Vacuum polarization of a massive scalar field in a wormhole spacetime
V. B. Bezerra, E. R. Bezerra de Mello, N. R. Khusnutdinov +1
We calculate the vacuum average value of the field square and the stress-energy tensor of a massive scalar field, with non-minimal coupling to the curvature in the short-throat…
Spherically symmetric vacuum solutions of modified gravity theory in higher dimensions
T. R. P. Caramês, E. R. Bezerra de Mello
In this paper we investigate spherically symmetric vacuum solutions of gravity in a higher dimensional spacetime. With this objective we construct a system of non-linear dif…
Relativistic Quantum Scattering on a Cone
J. Spinelly, E. R. Bezerra de Mello, V. B. Bezerra
We study the relativistic quantum mechanical scattering of a bosonic particle by an infinite straight cosmic string, considering the non-minimal coupling between the bosonic field…
Vacuum Polarization of Massless Spinor Field in Global Monopole Spacetime
E. R. Bezerra de Mello, V. B. Bezerra, N. R. Khusnutdinov
We calculate the renormalized vacuum average of the energy-momentum tensor of massless left-handed spinor field in the pointlike global monopole spacetime using point-separation ap…
Self-forces in the Spacetime of Multiple Cosmic Strings
E. R. Bezerra de Mello, V. B. Bezerra, Yu. V. Grats
We calculate the electromagnetic self-force on a stationary linear distribution of four-current in the spacetime of multiple cosmic strings. It is shown that if the current is infi…
Self-Forces on Electric and Magnetic Linear Sources in the Space-Time of a Cosmic String
E. R. Bezerra de Mello, V. B. Bezerra, C. Furtado +1
In this paper we calculate the magnetic and electric self-forces, induced by the conical structure of a cosmic string space-time, on a long straight wire which presents either a co…