56 citations · 180 across the 15 of their papers we have counts for
15 papers
LIV effects on the quantum stochastic motion in an acoustic FRW-geometry
M. A. Anacleto, C. H. G. Bessa, F. A. Brito +3
It is well known in the literature that vacuum fluctuations can induce a random motion of particles which is sometimes called quantum Brownian motion or quantum stochastic motion.…
Stochastic motion in an expanding noncommutative fluid
M. A. Anacleto, C. H. G. Bessa, F. A. Brito +2
A model for an expanding noncommutative acoustic fluid analogous to a Friedmann-Robertson-Walker geometry is derived. For this purpose, a noncommutative Abelian Higgs model is cons…
Inquiring electromagnetic quantum fluctuations about the orientability of space
N. A. Lemos, M. J. Reboucas
Orientability is an important topological property of spacetime manifolds. It is generally assumed that a test for spatial orientability requires a journey across the whole 3-space…
Electromagnetic vacuum fluctuations and topologically induced motion of a charged particle
C. H. G. Bessa, M. J. Reboucas
We show that a nontrivial topologies of the spatial section of Minkowski space-time allow for motion of a charged particle under quantum vacuum fluctuations of the electromagnetic…
Improved constraints on violations of the Einstein equivalence principle in the electromagnetic sector with complementary cosmic probes
R. F. L. Holanda, S. H. Pereira, V. C. Busti +1
Recent results have shown that a field non-minimally coupled to the electromagnetic Lagrangian can induce a violation of the Einstein equivalence principle. { This kind of coupling…
Quantum Brownian motion in an analog Friedmann-Robertson-Walker geometry
C. H. G. Bessa, V. B. Bezerra, E. R. Bezerra de Mello +1
In this paper we study the effects of quantum scalar field vacuum fluctuations on scalar test particles in an analog model for the Friedmann-Robertson-Walker spatially flat geometr…
Light-Cone Fluctuations in the Cosmic String Spacetime
H. F. Mota, E. R. Bezerra de Mello, C. H. G. Bessa +1
In this paper we consider light-cone fluctuations arising as a consequence of the nontrivial topology of the locally flat cosmic string spacetime. By setting the light-cone along t…
Vacuum Lightcone Fluctuations in a Dielectric
C. H. G. Bessa, V. A. De Lorenci, L. H. Ford +1
A model for observable effects of electromagnetic vacuum fluctuations is presented. The model involves a probe pulse which traverses a slab of nonlinear optical material with a non…
An Analog Model for Light Propagation in Semiclassical Gravity
C. H. G. Bessa, V. A. De Lorenci, L. H. Ford
We treat a model based upon nonlinear optics for the semiclassical gravitational effects of quantum fields upon light propagation. Our model uses a nonlinear material with a nonzer…
Casimir Energy Corrections by Light-Cone Fluctuations
E. Arias, C. H. G. Bessa, J. G. Dueñas +2
We study the effects of light-cone fluctuations on the renormalized zero-point energy associated with a free massless scalar field in the presence of boundaries. In order to simula…
Accelerated detectors in Dirac vacuum: the effects of horizon fluctuations
C. H. G. Bessa, J. G. Duenas, N. F. Svaiter
We consider an Unruh-DeWitt detector interacting with a massless Dirac field. Assuming that the detector is moving along an hyperbolic trajectory, we modeled the effects of fluctua…
An analog fluid model for some tachyonic effects in field theory
E. Arias, C. H. G. Bessa, N. F. Svaiter
We consider the sound radiation from an acoustic point-like source moving along a supersonic ("space-like") trajectory in a fluid at rest. We call it an acoustic "tachyonic" source…
Quantized fields and gravitational particle creation in f(R) expanding universes
S. H. Pereira, C. H. G. Bessa, J. A. S. Lima
The problem of cosmological particle creation for a spatially flat, homogeneous and isotropic Universes is discussed in the context of f(R) theories of gravity. Different from cosm…
Brownian Motion in Robertson-Walker Space-Times from electromagnetic Vacuum Fluctuations
Carlos H. G. Bessa, Valdir B. Bezerra, L. H. Ford
We consider classical particles coupled to the quantized electromagnetic field in the background of a spatially flat Robertson-Walker universe. We find that these particles typical…
On the existence of turning points in D-dimensionsal Schwarzschild-de Sitter and anti-de Sitter spacetimes
C. H. G. Bessa, J. A. S. Lima
We investigate the motion of a test particle in a d-dimensional, spherically symmetric and static space-time supported by a mass plus a -term. The motion is strongly depende…