Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Jaime F. Villas da Rocha"'
Publikováno v:
Futures. 105:91-103
In light of cutting-edge discussions aimed at fostering a resilient and flourishing global society, this work proposes a cohesive approach to examine societal scenarios vis-a-vis essential precepts for sustainability and stability of Earth’s life-g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10b70c85def028fc8fbd16ad3fa24a99
https://doi.org/10.1016/j.futures.2018.09.008
https://doi.org/10.1016/j.futures.2018.09.008
Autor:
Jaime F. Villas da Rocha, V. H. Satheeshkumar, R. Chan, M. Campista, O. Goldoni, M. F. A. da Silva
The Einstein-Aether (EA) theory belongs to a class of modified gravity theories characterized by the introduction of a time-like unit vector field, called aether. In this scenario, a preferred frame arises as a natural consequence of a broken Lorentz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3e5ad71040aa0e4882e01556e40fc6b4
http://arxiv.org/abs/1807.07553
http://arxiv.org/abs/1807.07553
Publikováno v:
Astrophysics and Space Science. 337:185-191
Using the conventional gravastar model, that is, an object constituted by two components where one of them is a massive infinitely thin shell and the other one is a de Sitter interior spacetime, we physically interpret a solution characterized by a z
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::14bee4b47a92f1febf626dff478f644e
https://doi.org/10.1007/s10509-011-0858-8
https://doi.org/10.1007/s10509-011-0858-8
Publikováno v:
International Journal of Modern Physics D. 17:1295-1309
We study the evolution of an N-dimensional anisotropic fluid with kinematic self-similarity of the second kind and find a class of solutions to the Einstein field equations by assuming an equation of state where the radial pressure of the fluid is pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::767209ccb51d338835b73cb8f47f746e
https://doi.org/10.1142/s0218271808012838
https://doi.org/10.1142/s0218271808012838
Publikováno v:
Physics Letters A. 367:423-430
A two-component fluid representing dark energy is studied. One of the components has a polytropic form, while the other has a barotropic form. Exact solutions are obtained and the cosmological parameters are constrained using supernova type Ia data.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::571fdaa0b311ffda0c26fedde7c598a4
https://doi.org/10.1016/j.physleta.2007.03.094
https://doi.org/10.1016/j.physleta.2007.03.094
Publikováno v:
General Relativity and Gravitation. 39:1675-1687
We study the evolution of an inhomogeneous fluid with self-similarity of the second kind and anisotropic pressure. We found a class of solution to the Einstein field equations by assuming an equation of state where the radial pressure of the fluid is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b9e2a99e64a2c091f47d9d42b87d063
https://doi.org/10.1007/s10714-007-0477-4
https://doi.org/10.1007/s10714-007-0477-4
Publikováno v:
International Journal of Modern Physics D. 15:1407-1417
We study the evolution of an anisotropic fluid with kinematic self-similarity of the second kind. We found a class of solution to the Einstein field equations by assuming an equation of state where the radial pressure of the fluid is proportional to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::30f3e6ade853f0bbf65e399e90accb89
https://doi.org/10.1142/s0218271806009133
https://doi.org/10.1142/s0218271806009133
Publikováno v:
International Journal of Modern Physics D. 12:1315-1332
We study spacetimes of spherically symmetric anisotropic fluid with homothetic self-similarity. We find a class of solutions to the Einstein field equations by assuming that the tangential pressure of the fluid is proportional to its radial one and t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::950ab7558ac441d426e69a1fcc5d1ed9
https://doi.org/10.1142/s0218271803003657
https://doi.org/10.1142/s0218271803003657
Autor:
Jaime F. Villas da Rocha
Publikováno v:
International Journal of Modern Physics D. 11:113-124
A large class of Type II fluid solutions to Einstein field equations in N-dimensional spherical spacetimes is found, wich includes most of the known solutions. A family of the generalized collapsing Vaidya solutions with homothetic self-similarity, p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fc16beec50bcf2d8eb10af5ae4db79fc
https://doi.org/10.1142/s0218271802001421
https://doi.org/10.1142/s0218271802001421
Publikováno v:
AIP Conference Proceedings.
We have constructed star models consisting of four parts: (i) a homogeneous inner core with anisotropic pressure (ii) an infinitesimal thin shell separating the core and the envelope; (iii) an envelope of inhomogeneous density and isotropic pressure;
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::47c72413e75be6d3b8b37f483e75d122
https://doi.org/10.1063/1.3462618
https://doi.org/10.1063/1.3462618