Cosmological aspects of the heterotic string above the Hagedorn temperature

Details Cosmological aspects of the heterotic string above the Hagedorn temperature Cosmological aspects of the heterotic string above the Hagedorn temperature

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phrvd..38.3087l&link_type=abstract

Physical Review D (Particles and Fields), Volume 38, Issue 10, 15 November 1988, pp.3087-3093

Physics

35

Canonical Formalism, Lagrangians, And Variational Principles, Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

We consider the cosmology of the heterotic string above the grand-unification scale taking into account the thermodynamical phase structure of an ideal gas of heterotic string excitations above the Hagedorn temperature. We find that the Universe expands up to a critical volume a9c above which the massive (Planckian) excitations should decay into massless excitations (nonequilibrium regime). The Universe then goes on expanding in a radiation-dominated phase with a scale factor a(t)~β(t). Because the heterotic string is self-dual with respect to temperature, it is argued that there is an induced duality relation for the scale factor a(t).

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