Zobrazeno 1 - 10
of 91
pro vyhledávání: '"Goncalves, S. V. B."'
Autor:
Monerat, G. A., Alvarenga, F. G., Gonçalves, S. V. B., Fracalossi, R., Oliveira-Neto, G., Santos, C. G. M., Silva, E. V. Corrêa
This work analyzes the effects of quantization on a Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) model with positive curvature and material content composed of a Bose-Einstein condensate, a radioactive fluid and a cosmological constant playing the
Externí odkaz:
http://arxiv.org/abs/2004.13064
Autor:
Monerat, G. A., Santos, C. G. M., Alvarenga, F. G., Gonçalves, S. V. B., Fracalossi, R., Silva, E. V. Corrêa, Oliveira-Neto, G.
Publikováno v:
Brazilian Journal of Physics, 2019
In this work we propose the quantization of a cosmological model describing the primordial universe filled with five barotropic fluids, namely: radiation, dust, vacuum, cosmic strings and domain walls. We intend to identify which fluid is best suited
Externí odkaz:
http://arxiv.org/abs/1908.05337
Akademický článek
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Autor:
Alvarenga, F. G., Filho, L. G. Ferreira, Fracalossi, R., Freitas, R. C., Gonçalves, S. V. B., Monerat, G. A., Oliveira-Neto, G., Silva, E. V. Corrêa
Publikováno v:
Physics of the Dark Universe Volume 25, September 2019, 100325
In this work we derive a scenario {in which} the early universe consists of {radiation fluid} and Bose-Einstein condensate. The possibility of gravitational self-interaction due to an attractive Bose-Einstein condensate is analyzed. The classical beh
Externí odkaz:
http://arxiv.org/abs/1610.06416
We review the Eulerian description of hidrodynamics using Seliger-Whitham's formalism (in classical case) and Schutz's formalism (in relativistic case). In these formalisms, the velocity field of a perfect fluid is described by scalar potentials. Wit
Externí odkaz:
http://arxiv.org/abs/1610.04589
In this work the homogeneous and isotropic Universe of Friedmann-Robertson-Walker is studied in the presence of two fluids: stiff matter and radiation described by the Schutz's formalism. We obtain to the classic case the behaviour of the scale facto
Externí odkaz:
http://arxiv.org/abs/1607.03478
In this paper we study the quantum cosmological Kantowski-Sachs model and solve the Wheeler-DeWitt equation in minisuperspace to obtain the wave function of the corresponding universe. The perfect fluid is described by the Schutz's canonical formalis
Externí odkaz:
http://arxiv.org/abs/1506.02495
Autor:
Freitas, R. C., Gonçalves, S. V. B.
We study the primordial Universe in a cosmological model where inflation is driven by a fluid with a polytropic equation of state $p = \alpha\rho + k\rho^{1 + 1/n}$. We calculate the dynamics of the scalar factor and build a Universe with constant de
Externí odkaz:
http://arxiv.org/abs/1310.2917
Autor:
Freitas, R. C., Gonçalves, S. V. B.
Publikováno v:
JCAP 04(2013)049
In the present work, we analyze the evolution of the scalar and tensorial perturbations and the quantities relevant for the physical description of the Universe, as the density contrast of the scalar perturbations and the gravitational waves energy d
Externí odkaz:
http://arxiv.org/abs/1211.6701
Publikováno v:
Astrophysics and Space Science, vol 349, Issue 1 (2014), page 443-455
We discuss how different cosmological models of the Universe affect the probability that a background source has multiple images related by an angular distance $\theta_E$ of the line of sight, \textit{i. e.}, the optical depth of gravitational lensin
Externí odkaz:
http://arxiv.org/abs/1210.1868