Zobrazeno 1 - 10
of 313
pro vyhledávání: '"Bittencourt, E."'
Publikováno v:
Mod. Phys. Lett. A 36 (2021) 2150248
We analyze the recently obtained static and spherically symmetric solution of the Spinor Theory of Gravity (STG) which, in the weak field limit, presents an effective Newtonian potential that contains an extra logarithmic behavior. We apply this solu
Externí odkaz:
http://arxiv.org/abs/2111.06441
Based upon the intrinsic symmetries approach to inhomogeneous cosmologies, we propose an exact solution to Einstein's field equations where the spatial sections are flat and the source is a non-perfect fluid such that the dissipative terms can be wri
Externí odkaz:
http://arxiv.org/abs/1907.06546
Autor:
Bittencourt e Carvalho, Romero1 srikrsnamurti@gmail.com
Publikováno v:
Numen: Revista de Estudos e Pesquisa da Religião. jan-jun2024, Vol. 27 Issue 1, p30-43. 14p.
Publikováno v:
Phys. Rev. D 98, 064042 (2018)
Hadamard-Papapetrou method of field discontinuities is here employed in order to determine the effective metric that describes the propagation of acoustic perturbations in isentropic fluids. It is shown that, when dissipative effects are present, sma
Externí odkaz:
http://arxiv.org/abs/1807.05052
Crude comparison between four alternative proposals for the very definition of a wormhole is provided, all of which were intended to apply to the dynamical cases. An interesting dynamical solution, based upon large scale magnetic fields, is used for
Externí odkaz:
http://arxiv.org/abs/1707.01078
Publikováno v:
Phys. Rev. D 93, 124023 (2016)
We discuss a class of models for gravity based on a scalar field. The models include and generalize the old approach by Nordstr\"om which predated and in some way inspired General Relativity. The class include also a model that we have recently intro
Externí odkaz:
http://arxiv.org/abs/1605.09778
We describe what cosmology looks like in the context of the geometric theory of gravity (GSG) based on a single scalar field. There are two distinct classes of cosmological solutions. An interesting feature is the possibility of having a bounce witho
Externí odkaz:
http://arxiv.org/abs/1412.4227
Publikováno v:
Class. Quantum Grav. 31 145007 (2014)
Propagation of light in nonlinear materials is here studied in the regime of the geometrical optics. It is shown that a spherically symmetric medium at rest with some specific dielectric properties can be used to produce an exact analogue model for a
Externí odkaz:
http://arxiv.org/abs/1401.7544
Autor:
Novello, M., Bittencourt, E.
We present the expression $t_{\mu\nu}$ of the energy-momentum tensor of the gravitational field in the framework of the recent proposal of the Geometric Scalar theory of gravity (GSG). From the conservation of $t_{\mu\nu}$ it follows the dynamics of
Externí odkaz:
http://arxiv.org/abs/1311.6984
A comprehensive review of the equations of general relativity in the quasi-Maxwellian (QM) formalism introduced by Jordan, Ehlers and Kundt is made. Our main interest concerns its applications to the analysis of the perturbation of standard cosmology
Externí odkaz:
http://arxiv.org/abs/1302.7248