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Dilaton and off-shell (non-critical string) effects in Boltzmann equation for species abundances

AB Lahanas1, NE Mavromatos2 and DV Nanopoulos435

Author Affiliations

1 University of Athens, Physics Department, Nuclear and Particle Physics Section, GR157 71, Athens, Greece.

2 King's College London, University of London, Department of Physics, Strand WC2R 2LS, London, UK.

3 George P. and Cynthia W. Mitchell Institute for Fundamental Physics, Texas A&M University, College Station, TX 77843, USA.

4 Astroparticle Physics Group, Houston Advanced Research Center (HARC), Mitchell Campus, Woodlands, TX 77381, USA.

5 Academy of Athens, Division of Natural Sciences, 28 Panepistimiou Avenue, Athens 10679, Greece.


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PMC Physics A 2007, 1:2 doi:10.1186/1754-0410-1-2

Published: 2 October 2007

Abstract

In this work we derive the modifications to the Boltzmann equation governing the cosmic evolution of relic abundances induced by dilaton dissipative-source and non-critical-string terms in dilaton-driven non-equilibrium string Cosmologies. We also discuss briefly the most important phenomenological consequences, including modifications of the constraints on the available parameter space of cosmologically appealing particle physics models, imposed by recent precision data of astrophysical measurements.

PACS codes: 11.25.Wx, 98.80.Ft, 95.35.+d