47 citations · 142 across the 17 of their papers we have counts for
17 papers
Genericness of quantum damping of cosmological shear in modified loop quantum cosmology
Wen-Cong Gan, Leila L. Graef, Rudnei O. Ramos +2
In arXiv:2603.18175, the authors argue, based on numerical studies of particular cases, that the quantum damping of cosmological shear in a modified loop quantum cosmological model…
Polymerized spacetime dynamics with multifield source: Unraveling the pre-inflationary Universe
Divya Gupta, Manabendra Sharma, Gustavo S. Vicente +2
We study a multifield model in loop quantum cosmology for a maximally symmetric spacetime governed by the Einstein-Hilbert action minimally coupled to scalar fields. Using a Legend…
Constraining a de Broglie--Bohm quantum bounce cosmology with Planck data
Micol Benetti, Rudnei O. Ramos, Renato Silva +1
This work investigates a singularity-free early Universe within the paradigm of quantum cosmology. We develop a bouncing model where the singularity is resolved via the de Broglie-…
Quantum Damping of Cosmological Shear: A New Prediction from Loop Quantum Cosmologies
Wen-Cong Gan, Leila L. Graef, Rudnei O. Ramos +2
We study the dynamics of the Bianchi I universe in modified loop quantum cosmology (mLQC-I) and uncover a robust mechanism for isotropization: the shear is dynamically suppressed a…
Constraints on Metastable Dark Energy Decaying into Dark Matter
J. S. T. de Souza, G. S. Vicente, L. L. Graef
We revisit the proposal that an energy transfer from dark energy into dark matter can be described in field theory by a first order phase transition. We analyze the model proposed…
Defying eternal inflation in warm inflation with a negative running
Gabriele Montefalcone, Rudnei O. Ramos, Gustavo S. Vicente +1
It was pointed out previously~\cite{Kinney:2014jya} that a sufficiently negative running of the spectral index of curvature perturbations from (ordinary i.e. cold) inflation is abl…
Quantum geometric formulation of Brans-Dicke theory for Bianchi I spacetime
Manabendra Sharma, Gustavo S. Vicente, Leila L. Graef +2
This paper investigates Bianchi I spacetimes within the Jordan frame of Brans-Dicke theory, incorporating the framework of effective loop quantum gravity. After developing general…
Bouncing and inflationary dynamics in quantum cosmology in the de Broglie-Bohm interpretation
G. S. Vicente, Rudnei O. Ramos, Vitória N. Magalhães
The quantum cosmology of the flat Friedmann-Lema{î}tre-Robertson-Walker Universe, filled with a scalar field, is considered in the de Broglie-Bohm (dBB) interpretation framework. A…
Gravitational Particle Production and the Validity of Effective Descriptions in Loop Quantum Cosmology
Gustavo S. Vicente, Rudnei O. Ramos, Leila L. Graef
The effective approach in Loop Quantum Cosmology (LQC) has provided means to obtain predictions for observable quantities in LQC models. While an effective dynamics in LQC has been…
Quantum Hořava-Lifshitz cosmology in the de Broglie-Bohm interpretation
G. S. Vicente
Classical and quantum Friedmann-Lemaître-Robertson-Walker universes filled with non-interacting radiation and dust fluids are considered in the framework of Hořava-Lifshitz gravity…
Baryogenesis in cosmological models with symmetric and asymmetric quantum bounces
P. C. M. Delgado, M. B. Jesus, N. Pinto-Neto +2
The baryon-antibaryon asymmetry (excess of matter over antimatter in our Universe), indicated by observational data from the Cosmic Microwave Background anisotropies, predictions o…
Gravitational Particle Production in Loop Quantum Cosmology
Leila L. Graef, Rudnei O. Ramos, Gustavo S. Vicente
We investigate the gravitational particle production in the bounce phase of Loop Quantum Cosmology (LQC). We perform both analytical and numerical analysis of the particle producti…
Vector perturbations in bouncing cosmology
Nelson Pinto-Neto, Júlio C. Fabris, Júnior D. Toniato +2
An old question surrounding bouncing models concerns their stability under vector perturbations. Considering perfect fluids or scalar fields, vector perturbations evolve kinematica…
Fermion Production in Bouncing Cosmologies
A. Scardua, L. F. Guimarães, N. Pinto-Neto +1
We address the issue of fermionic particle creation in cosmological bouncing models governed by General Relativity, but where the bounce itself takes place due to quantum effects.…
Eternal inflation in a dissipative and radiation environment: Heated demise of eternity
Gustavo S. Vicente, Leandro A. da Silva, Rudnei O. Ramos
Eternal inflation is studied in the context of warm inflation. We focus on different tools to analyze the effects of dissipation and the presence of a thermal radiation bath on the…
Bivelocity picture in the nonrelativistic limit of relativistic hydrodynamics
Tomoi Koide, Rudnei O. Ramos, Gustavo S. Vicente
We discuss the nonrelativistic limit of the relativistic Navier-Fourier-Stokes (NFS) theory. The next-to-leading order relativistic corrections to the NFS theory for the Landau-Lif…
Stability analysis for the background equations for inflation with dissipation and in a viscous radiation bath
Mar Bastero-Gil, Arjun Berera, Rafael Cerezo +2
The effects of bulk viscosity are examined for inflationary dynamics in which dissipation and thermalization are present. A complete stability analysis is done for the background i…