Zobrazeno 1 - 10
of 67
pro vyhledávání: '"E. L. D. Perico"'
Modified gravity (MG) theories aim to reproduce the observed acceleration of the Universe by reducing the dark sector while simultaneously recovering General Relativity (GR) within dense environments. Void studies appear to be a suitable scenario to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::318e242851485026c129cd03f79e6928
http://hdl.handle.net/10852/75154
http://hdl.handle.net/10852/75154
Autor:
E. L. D. Perico, Laerte Sodré, Walter de Siqueira Pedra, Leandro Beraldo e Silva, Marcos Lima
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
The collapse of a collisionless self-gravitating system, with the fast achievement of a quasi-stationary state, is driven by violent relaxation, with a typical particle interacting with the time-changing collective potential. It is traditionally assu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f5ac9c2487e413cebf85ef28a72ba54
Autor:
E. L. D. Perico
Publikováno v:
Biblioteca Digital de Teses e Dissertações da USP
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
As observações astronômicas dos últimos 15 anos revelaram que o universo atualmente está expandindo aceleradamente. No contexto da relatividade geral se acredita que a energia escura, cujo melhor candidato é a densidade do vácuo ($\\Lambda/8\\
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3b3e997b7cc4c36e527a33c950f82ce2
https://doi.org/10.11606/t.43.2015.tde-28042015-182504
https://doi.org/10.11606/t.43.2015.tde-28042015-182504
Autor:
E. L. D. Perico, D. A. Tamayo
In cosmology, phenomenologically motivated expressions for running vacuum are commonly parametrized as linear functions $\Lambda(H^2)$ or $\Lambda(R)$. Such kind of models assume an equation of state for vacuum given by $\,\overline P_\Lambda=-\,\ove
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b5b616c3fd868370c0fc13499c2763f6
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
The gravitational collapse of a spherical core, in which the fluid component interact with a growing vacuum energy density, filling an homogeneous and isotropic geometry with an arbitrary curvature parameter, is investigated. The complete set of exac
Publikováno v:
European Journal of Physics. 31:129-141
In this paper, an experimental setup for undergraduate courses to study the damped harmonic motion of a sphere inside a fluid as a function of the medium viscosity is presented. To observe the dependence of the oscillation of the sphere on the medium
Publikováno v:
Physical Review D. 88
In the present mainstream cosmology, matter and spacetime emerged from a singularity and evolved through four distinct periods: early inflation, radiation, dark matter and late-time inflation (driven by dark energy). During the radiation and dark mat
Autor:
E. L. D. Perico, Alex E. Bernardini
Modifications on the predictions about the matter power spectrum based on the hypothesis of a tiny contribution from a degenerate Fermi gas (DFG) test-fluid to some dominant cosmological scenario are investigated. Reporting about the systematic way o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5028db7f5b219ca7ae307d638756fe0b
Autor:
Alex E. Bernardini, E. L. D. Perico
The hypothesis of a tiny fraction of the cosmic inventory evolving cosmologically as a degenerate Fermi gas test fluid at some dominant cosmological background is investigated. Our analytical results allow for performing preliminary computations to t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::befcf8a098437756c1d161f4053e8a17
http://arxiv.org/abs/1012.4500
http://arxiv.org/abs/1012.4500
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
We propose a large class of nonsingular cosmologies of arbitrary spatial curvature whose cosmic history is determined by a primeval dynamical Λ(t)-term. For all values of the curvature, the models evolve between two extreme de Sitter phases driven b