Coupled DM Heating in SCDEW Cosmologies

/ 06 12 67 2 v 1 2 2 D ec 2 00 6 Cosmologies with dynamical and coupled Dark Energy vs . CMB data

We compare a large set of cosmologies with WMAP data, performing a fit based on a MCMC algorithm. Besides of ΛCDM models, we take dynamical DE models, where DE and DM are uncoupled or coupled, both in the case of constant coupling and in the case when coupling varies with suitable laws. DE however arises from a scalar field self–interacting through a SUGRA potential. We find that the best fitti...

A ug 2 00 6 Mass functions in coupled Dark Energy models

We evaluate the mass function of virialized halos, by using Press & Schechter (PS) and/or Steth & Tormen (ST) expressions, for cosmologies where Dark Energy (DE) is due to a scalar self– interacting field, coupled with Dark Matter (DM). We keep to coupled DE (cDE) models known to fit linear observables. To implement the PS–ST approach, we start from reviewing and extending the results of a prev...

G2–cosmologies with perfect fluid in dilaton gravity

We present a method for generating exact diagonal G2-cosmological solutions in dilaton gravity coupled to a radiation perfect fluid and with a cosmological potential of a special type. The method is based on the symmetry group of the system of G2-field equations. Several new classes of explicit exact inhomogeneous perfect fluid scalar-tensor cosmologies are presented.

Gravitational Instability of Yang-Mills Cosmologies

The gravitational instability of Yang-Mills cosmologies is numerically studied with the hamiltonian formulation of the spherically symmetric Einstein-Yang-Mills equations with SU(2) gauge group. On the short term, the expansion dilutes the energy densities of the YangMills fluctuations due to their conformal invariance. In this early regime, the gauge potentials appear oscillating quietly in an...

Supersymmetric homogeneous quantum cosmologies coupled to a scalar field.