Cosmological difficulties for intermediate scales in superstring models

Details Cosmological difficulties for intermediate scales in superstring models Cosmological difficulties for intermediate scales in superstring models

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phlb..169..343e&link_type=abstract

Physics Letters B, Volume 169, Issue 4, p. 343-346.

Physics

44

Scientific paper

It is shown that primordial nucleosynthesis puts a severe limit MI <~ 1013 GeV on the intermediate mass scale in superstring theories. More stringent but also more uncertain limits can be obtained from the baryon-to-entropy ratio. All superstring models with more than three generations are ruled out.
On leave of absence from Instituto de Estructura de la Materia, Serrano 119, 28006 Madrid, Spain.

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