Zobrazeno 1 - 10
of 954
pro vyhledávání: '"Vicente, A. S."'
Publikováno v:
Universe. 2024; 10(9):371
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 in Ref. Abdalla et al. (2013), using updated constraints on the decay
Externí odkaz:
http://arxiv.org/abs/2403.04970
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 able to prevent eternal inflation from ever occurring. Here, we reevaluat
Externí odkaz:
http://arxiv.org/abs/2311.03487
We consider a formulation of the Brans-Dicke theory in Jordan's frame for Bianchi-I spacetime within the framework of loop quantum gravity. The robustness of singularity resolutions due to the quantum effects is explicitly verified in the context of
Externí odkaz:
http://arxiv.org/abs/2309.01080
The quantum cosmology of the flat Friedmann-Lema{\^i}tre-Robertson-Walker Universe, filled with a scalar field, is considered in the de Broglie-Bohm (dBB) interpretation framework. A stiff-matter quantum bounce solution is obtained. The bouncing and
Externí odkaz:
http://arxiv.org/abs/2304.13059
Crystal lattice structure is present in stellar compact objects, such as white dwarf stars and in the crust of neutron stars. These structures can be described by a body-centered cubic crystal, which is formed by ions due to Coulombian interactions i
Externí odkaz:
http://arxiv.org/abs/2212.08737
Publikováno v:
Physical Review D, Vol. 106, No. 4 (2022)
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 extensively considered in different scenarios, a robust demonstration
Externí odkaz:
http://arxiv.org/abs/2207.00435
Autor:
Vicente, G. S.
Classical and quantum Friedmann-Lema\^itre-Robertson-Walker universes filled with non-interacting radiation and dust fluids are considered in the framework of Ho\v{r}ava-Lifshitz gravity theory. The Ho\v{r}ava-Lifshitz theory is set in its projectabl
Externí odkaz:
http://arxiv.org/abs/2111.11382
Publikováno v:
Phys. Rev. D 102 (2020) 063529
The baryon-antibaryon asymmetry (excess of matter over antimatter in our Universe), indicated by observational data from the Cosmic Microwave Background anisotropies, predictions of primordial Nucleosynthesis, and the absence of intense radiation fro
Externí odkaz:
http://arxiv.org/abs/2010.04807
Publikováno v:
Phys. Rev. D 102, 043518 (2020)
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 production process in a LQC scenario with Bunch-Davies vacuum initial conditio
Externí odkaz:
http://arxiv.org/abs/2007.02395
Autor:
Pinto-Neto, Nelson, Fabris, Júlio C., Toniato, Júnior D., Vicente, Gustavo. S., Vitenti, Sandro D. P.
Publikováno v:
Phys. Rev. D 101, 123519 (2020)
An old question surrounding bouncing models concerns their stability under vector perturbations. Considering perfect fluids or scalar fields, vector perturbations evolve kinematically as $a^{-2}$, where $a$ is the scale factor. Consequently, a defini
Externí odkaz:
http://arxiv.org/abs/2004.07655