ar X iv : g r - qc / 9 81 10 89 v 1 2 6 N ov 1 99 8 Spectral methods in general relativistic astrophysics

ar X iv : g r - qc / 9 51 10 48 v 1 1 6 N ov 1 99 5 Two lectures on Two - Dimensional Gravity ∗

ar X iv : g r - qc / 9 81 10 50 v 1 1 6 N ov 1 99 8 Are Decoherent Histories logically consistent ? Angelo

With reference to a particular example, we prove that the Decoherent Histories approach to Quantum Mechanics meets logical contradictions unless one drastically limits the allowed decoherent families. Our proof follows a line of reasoning different from the one of anologous criticisms which have been put forward recently; due to its different logical structure, it cannot be rejected on the basi...

ar X iv : g r - qc / 9 61 10 11 v 1 5 N ov 1 99 6 On Relation between String Theory and Multidimensional Cosmology

It is shown that a transition from a multidimensional cosmological model with one internal space of the dimension d 1 to the effective tree-level bosonic string corresponds to an infinite number of the internal dimensions: d 1 → ∞.

ar X iv : g r - qc / 9 91 10 87 v 1 2 2 N ov 1 99 9 1 Eternal inflation and the present universe

Eternally inflating universes can contain thermalized regions with different values of the cosmological parameters. In particular, the spectra of density fluctuations should be different, because of the different realizations of quantum fluctuations of the inflaton field. I discuss a general method for calculating probability distributions for such variable parameters and analyze the density fl...

ar X iv : g r - qc / 9 81 10 22 v 1 6 N ov 1 99 8 The one - loop divergences of the linear gravity withthe torsion terms in tetrad approach

In this paper we discuss the connection between the geometric and tetrad approaches in the quantum affine-metric gravity. The corresponding transition formulas are obtained at the one-loop level. As an example, the one-loop counterterms are calculated in the tetrad formalism in the theory with terms quadratic in the torsion field. This model possesses the extra local symmetries connected with t...