Zobrazeno 1 - 10
of 138
pro vyhledávání: '"R. S. Moraes"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 2, Pp 1-10 (2024)
Abstract The f(R, T) gravity models, for which R is the Ricci scalar and T is the trace of the energy–momentum tensor, elevate the degrees of freedom of the renowned f(R) theories, by making the Einstein field equations of the theory to also depend
Externí odkaz:
https://doaj.org/article/e280c33e1aa948088f78eb320521ae83
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 12, Pp 1-8 (2022)
Abstract This work analyses the hydrostatic equilibrium configurations of strange stars in a non-minimal geometry-matter coupling (GMC) theory of gravity. Those stars are made of strange quark matter, whose distribution is governed by the MIT equatio
Externí odkaz:
https://doaj.org/article/9e4ecec9ddc845b4824f5f0e2e9b08c0
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 5, Pp 1-7 (2020)
Abstract In this work we analyze hydrostatic equilibrium configurations of neutron stars in a non-minimal geometry-matter coupling (GMC) theory of gravity. We begin with the derivation of the hydrostatic equilibrium equations for the f(R, L) gravity
Externí odkaz:
https://doaj.org/article/86f24ae69af34f899f1d9366a21ad686
Autor:
Lucas M. de Sá, Antônio Bernardo, Riis R. A. Bachega, Livia S. Rocha, Pedro H. R. S. Moraes, Jorge E. Horvath
Publikováno v:
Galaxies, Vol 11, Iss 1, p 19 (2023)
The study of compact object populations has come a long way since the determination of the mass of the Hulse–Taylor pulsar, and we now count on more than 150 known Galactic neutron stars and black hole masses, as well as another 180 objects from bi
Externí odkaz:
https://doaj.org/article/3e0b0d1f7b8649b2b85f4e746cfafbf9
Publikováno v:
Universe, Vol 9, Iss 1, p 12 (2022)
The standard formulation of General Relativity Theory, in the absence of a cosmological constant, is unable to explain the responsible mechanism for the observed late-time cosmic acceleration. On the other hand, by inserting the cosmological constant
Externí odkaz:
https://doaj.org/article/6c2bdadd39de4acb85a8e110d3561167
Autor:
P. H. R. S. Moraes, P. K. Sahoo
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 8, Pp 1-6 (2019)
Abstract Alternative gravity is nowadays an extremely important tool to address some persistent observational issues, such as the dark sector of the universe. They can also be applied to stellar astrophysics, leading to outcomes one step ahead of tho
Externí odkaz:
https://doaj.org/article/f165feb0886143309588728ab111651e
Autor:
P. H. R. S. Moraes
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 8, Pp 1-5 (2019)
Abstract The f(R, T) gravity field equations depend generically on both the Ricci scalar R and trace of the energy–momentum tensor T. Within the assumption of perfect fluids, the theory carries an arbitrariness regarding the choice of the matter la
Externí odkaz:
https://doaj.org/article/10fc69e460f14e1694540e8ecab8d853
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 11, Pp 1-8 (2018)
Abstract 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 combination of those with a BNRT model. Moreover, we work with a
Externí odkaz:
https://doaj.org/article/9fa548aed831406692a991aaacc0c9ab
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 9, Pp 1-10 (2018)
Abstract This article presents cosmological models that arise in a subclass of $$f(R,T)=f(R)+f(T)$$ f(R,T)=f(R)+f(T) gravity models, with different f(R) functions and fixed T-dependence. That is, the gravitational lagrangian is considered as $$f(R,T)
Externí odkaz:
https://doaj.org/article/601f45547b98452fa3ad851e5b2b74bf
Publikováno v:
Eclética Química, Vol 36, Iss 1, Pp 64-77 (2018)
“Aspectos químicos e biológicos do gênero Lippia enfatizando Lippia gracilis Schauer”. Esta revisão apresenta um estudo sobre os principais constituintes químicos e aspectos biológicos de espécies do gênero Lippia enfatizando a Lippia gra
Externí odkaz:
https://doaj.org/article/50fc0efd905742e8917954f0b1877933