91 citations · 233 across the 20 of their papers we have counts for
20 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.…
Diffusive process under Lifshitz scaling and pandemic scenarios
M. A. Anacleto, F. A. Brito, A. R. de Queiroz +2
We here propose to model active and cumulative cases data from COVID-19 by a continuous effective model based on a modified diffusion equation under Lifshitz scaling with a dynamic…
Cosmology from an exponential dependence on the trace of the energy-momentum tensor -- Numerical approach and cosmological tests
G. Ribeiro, R. Sfair, P. H. R. S. Moraes +2
In this paper, we present the cosmological scenario obtained from gravity by using an exponential dependence on the trace of the energy-momentum tensor. With a numerical a…
A general method for transforming non-physical configurations in BPS states
J. R. L. Santos, A. de Souza Dutra, O. C. Winter +1
In this work, we apply the so-called BPS method in order to obtain topological defects for a complex scalar field Lagrangian introduced by Trullinger and Subbaswamy. The BPS approa…
Lorentz-violating dimension-five operator contribution to the black body radiation
M. A. Anacleto, F. A. Brito, E. Maciel +4
We investigate the thermodynamics of a photon gas in an effective field theory model that describes Lorentz violations through dimension-five operators and Horava-Lifshitz theory.…
Cosmology from a running vacuum model driven by a scalar field
J. R. L. Santos, P. H. R. S. Moraes
The possibility that the vacuum energy density is, indeed, varying in time, has been investigated lately from the running vacuum models perspective. Motivated by such models,…
New family of potentials with analytical twiston-like solutions
J. R. L. Santos, D. S. S. Borges, I. O. Moreira
In this letter we present a new approach to find analytical twiston models. The effective two-field model was constructed by a non-trivial combination of two one field systems. In…
Harmonic oscillators from displacement operators and thermodynamics
F. A. Brito, F. F. Santos, J. R. L. Santos
In this investigation, the displacement operator is revisited. We established a connection between the Hermitian version of this operator with the well-known Weyl ordering. Besides…
Cosmology in the Universe with distance dependent Lorentz-violating bakground
C. A. G. Almeida, M. A. Anacleto, F. A. Brito +2
We consider a cosmological setup with the inflaton field in the presence of a redshift dependent Lorentz-violating time-like background to address the inflationary regime and other…
Building analytical three-field cosmological models
J. R. L. Santos, P. H. R. S. Moraes, D. A. Ferreira +1
A difficult task to deal with is the analytical treatment of models composed by three real scalar fields, once their equations of motion are in general coupled and hard to be integ…
Cosmological scenarios from multiquintessence
R. A. C. Correa, P. H. R. S. Moraes, A. de Souza Dutra +2
In this work we derive and analyse cosmological scenarios coming from multi-component scalar field models. We consider a direct sum of a sine-Gordon with a Z2 model, and also a com…
Soliton solutions in two-dimensional Lorentz-violating higher derivative scalar theory
E. Passos, C. A. G. Almeida, F. A. Brito +3
This paper shows a new approach to obtain analytical topological defects of a 2D Myers-Pospelov Lagrangian for two scalar fields. Such a Lagrangian presents higher-order kinetic te…
A complete cosmological scenario from gravity theory
P. H. R. S. Moraes, J. R. L. Santos
Recent elaborated by T. Harko and collaborators, the theories of gravity contemplate an optimistic alternative to dark energy, for which and stand for the Ricci sc…
Fast-roll solutions from two scalar fields inflation
J. R. L. Santos, P. H. R. S. Moraes
One common approach for cosmic inflation consists in couple Einstein's gravity with a scalar field, often referred to inflaton field. In order to derive analytic simple scenarios,…
A path integral approach to the Langevin equation
Ashok K. Das, Sudhakar Panda, J. R. L. Santos
We study the Langevin equation with both a white noise and a colored noise. We construct the Lagrangian as well as the Hamiltonian for the generalized Langevin equation which leads…
Solitonic traveling waves in Galileon theory
D. Bazeia, L. Losano, J. L. R. Santos
This work deals with traveling waves in the two-dimensional Galileon theory. We use the Hirota procedure to calculate one-Galileon, two-Galileon, three-Galileon and breather-like G…
Two scalar field cosmology from coupled one-field models
P. H. R. S. Moraes, J. R. L. Santos
One possible description for the current accelerated expansion of the universe is quintessence dynamics. The basic idea of quintessence consists of analyzing cosmological scenarios…
Kinklike structures in scalar field theories: from one-field to two-field models
D. Bazeia, L. Losano, J. R. L. Santos
In this paper we study the possibility of constructing two-field models from one-field models. The idea is to start with a given one-field model and use the deformation procedure t…
Construction of new scalar field models from the standard theory
D. Bazeia, M. A. González León, L. Losano +2
In this work we study models described by a single real scalar field in two-dimensional space-time, using the deformation procedure to propose and investigate new families of model…
Multi-sine-Gordon Models
D. Bazeia, L. Losano, J. M. C. Malbouisson +1
This work deals with the presence of defect structures in generalized sine-Gordon models. The models are described by periodic potentials, with substructure having one, two, three…