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9 papers · 1 filter
Shear and Vorticity in an Accelerating Brans-Dicke Lambda-Universe with Torsion
Marcelo Samuel Berman
We study accelerating Universes with power-law scale-factors. We include shear and vorticity, a cosmological "constant" term, and spin from torsion, as in Einstein-Cartan's theory…
A General Relativistic Rotating Evolutionary Universe - Part II
Marcelo Samuel Berman
As a sequel to (Berman, 2008a), we show that the rotation of the Universe can be dealt by generalised Gaussian metrics, defined in this paper. Robertson-Walker's metric has been em…
Shear and Vorticity in Inflationary Brans-Dicke Cosmology with Lambda-Term
Marcelo Samuel Berman
We find a solution for exponential inflation in Brans-Dicke cosmology endowed with a cosmological term, which includes time-varying shear and vorticity. We find that the scalar fie…
Natural Entropy Production in an Inflationary Model for a Polarized Vacuum
Marcelo Samuel Berman, Murari M. Som
Though entropy production is forbidden in standard FRW Cosmology, Berman and Som presented a simple inflationary model where entropy production by bulk viscosity, during standard i…
Is the Universe a White-Hole?
Marcelo Samuel Berman
Pathria(1972) has shown, for a pressureless closed Universe, that it is inside a black (or white) hole. We show now, that the Universe with a cosmic pressure obeying Einstein's fie…
On the Machian Origin of Inertia
Marcelo Samuel Berman
We examine Sciama's inertia theory: we generalise it, by combining rotation and expansion in one unique model, we find the angular speed of the Universe, and we stress that the the…