The string coupling accelerates the expansion of the universed

Details The string coupling accelerates the expansion of the universed The string coupling accelerates the expansion of the universed

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005gregr..37.1665e&link_type=abstract

General Relativity and Gravitation, Volume 37, Issue 10, pp.1665-1670

Mathematics

Logic

1

Cosmology, Dilaton Background

Scientific paper

Generic cosmological models in non-critical string theory have a time-dependent dilaton background at a late epoch. The cosmological deceleration parameter q 0 is given by the square of the string coupling, g s 2, up to a negative sign. Hence the expansion of the Universe must accelerate eventually, and the observed value of q 0 corresponds to g s 2 ˜ 0.6. In this scenario, the string coupling is asymptotically free at large times, but its present rate of change is imperceptibly small.

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