Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Piattella, Oliver Fabio"'
Publikováno v:
Phys. Rev. D 110, 064042 (2024)
We address the question of how to build a class of $f(R)$ extensions of General Relativity which are compatible with solar system experiments, without making any preliminary assumption on the properties of $f$. The aim is reached by perturbatively so
Externí odkaz:
http://arxiv.org/abs/2406.04417
We investigate the cosmological implications of an effective gravitational action, inspired by Sakharov's idea of induced gravity, containing non-local contributions from the operator $\left(\Box +\beta \right)^{-1} R$. The $\beta$ term is a novel fe
Externí odkaz:
http://arxiv.org/abs/2302.06762
We study how the evolution of a Dark Energy Quintessence fluid is modified by the presence of a matter inhomogeneity. To do so, we study linear perturbations of a flat FLRW background containing dust and a slowly rolling scalar field. Under the assum
Externí odkaz:
http://arxiv.org/abs/2102.11735
Publikováno v:
Universe 2020, 6, 50
We study a quantization via fractional derivative of a nonminimal derivative coupling cosmological theory, namely, the Fab Four John theory. Its Hamiltonian version presents the issue of fractional powers in the momenta. That problem is solved here b
Externí odkaz:
http://arxiv.org/abs/2001.07680
Publikováno v:
Class. Quantum Grav. 37 (2020) 105005
In a Bohmian quantum cosmology scenario, we investigate some quantum effects on the evolution of the primordial universe arising from the adoption of an alternative non-trivial ordering to the quantization of the constrained Hamiltonian of a minimall
Externí odkaz:
http://arxiv.org/abs/1911.01487
Publikováno v:
Phys. Rev. D 100, 123508 (2019)
We investigate the behavior of the asymptotic late-times effective equation of state for a class of nonlocal theories of gravity. These theories modify the Einstein-Hilbert Lagrangian introducing terms containing negative powers of the d'Alembert ope
Externí odkaz:
http://arxiv.org/abs/1906.10480
Publikováno v:
Physics Letters B 798 (2019) 135003
We present here a quantum cosmological model with Bohm-de Broglie interpretation of the theory described by a combination of two terms of the Fab Four cosmological theory. The first term is the John Lagrangian and the second is a potential representi
Externí odkaz:
http://arxiv.org/abs/1811.08852
Autor:
Teixeira, Poliane de Morais
Publikováno v:
Repositório Institucional da UFJF
Universidade Federal de Juiz de Fora (UFJF)
instacron:UFJF
Universidade Federal de Juiz de Fora (UFJF)
instacron:UFJF
Nessa tese, exploramos diferentes aspectos do grupo de renormalização (GR) em Gravitação Quântica. Especificamente, estudamos o GR aplicado a três diferentes modelos. Começamos por estudar o GR on-shell usando para isso o modelo de gravidade c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::01f0c2b9dd7647e0fd97c96818883922
https://repositorio.ufjf.br/jspui/handle/ufjf/4897
https://repositorio.ufjf.br/jspui/handle/ufjf/4897
Autor:
Oakes, Thiago Luiz Antonacci
Publikováno v:
Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
Universidade Federal do Espírito Santo (UFES)
instacron:UFES
Universidade Federal do Espírito Santo (UFES)
instacron:UFES
Made available in DSpace on 2018-08-01T22:30:00Z (GMT). No. of bitstreams: 1 tese_6812_Tese final Thiago Oakes20141114-121507.pdf: 378469 bytes, checksum: 13e58c69ea83014550c9b1bd4e49cfd3 (MD5) Previous issue date: 2013-08-23 CAPES Neste trabalho cal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::df0bd2dbced84ae684db895a8bbb1647
http://repositorio.ufes.br/handle/10/7485
http://repositorio.ufes.br/handle/10/7485