We ”explain”, using a Classical approach, how the Universe was created out of ”nothing ”,i.e., with no input of initial energy nor mass. The inflationary phase, with exponential expansion, is accounted for, automatically, by our equation of state for the very early Universe. This is a Universe with no-initial infinite singularity of energy density.

Schrödinger-Wheeler-DeWitt equation in chaplygin gas FRW

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Abstract. Cosmological models involving shear and rotation are considered, first in the general relativistic and then in the Newtonian framework with the aim of investigating singularities in them by using numerical and analytical techniques. The dynamics of these rotating models are studied

PACS number: 98.80 In this work, we are investigating the problem of integrability of Bianchi class A cosmological models. This class of systems is reduced to the form of Hamiltonian systems with exponential potential forms. The dynamics of Bianchi class A models is investigated through the Euler

Abstract. We consider the problem of extracting physical predictions from the wave function of the universe in quantum cosmological models. We state the features of quantum cosmology an interpretational scheme should confront. We discuss the Everett interpretation, and extensions of it

Abstract. It is shown that in homogeneous cosmological models the Einstein equations can be reduced, on the basis of scale invariance, to systems with fric-tion. The formalism involving friction permits one to investigate the problem of isotropization of the solutions in the Bianchi model IX

In 1985 Goode and Wainwright devised the concept of an isotropic singularity. Since that time, numerous authors have explored the interesting consequences, in mathematical cosmology, of assuming the existence of this type of singularity. In this paper, we collate all examples of cosmological models

This is a course on cosmic microwave background (CMB) anisotropies in the standard cosmological model, designed for beginning graduate students and advanced undergraduates. “Standard cosmological model ” in this context means a Universe dominated by some form of cold dark matter (CDM

also show how a so peculiar solution can be inferred to describe the more interesting case of a generic cosmological model. PACS: 04.20.Jb 98.80.Bp-Cq 1.