RELAXATION DARK ENERGYIN NON-CRITICAL STRING COSMOLOGIES ANDASTROPHYSICAL DATA

摘要

In this talk we review briefly the basic features of non-critical (dissipative)String Cosmologies, and we confront some of these models with supernova data.We pay particular attention to the off-shell and dilaton contributions to thedynamical evolution equations of the non-critical string Universe, as well as theBoltzmann equation for species abundances. The latter could have importantconsequences for the modification of astrophysical constraints on physicallyappealing particle physics models, such as supersymmetry. The data fits showthat non-critical string cosmologies may be viable alternatives to ACDM model.