Physics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phlb..174..176e&link_type=abstract
Physics Letters B, Volume 174, Issue 2, p. 176-182.
Physics
131
Scientific paper
Any of the particles listed in the title may cause a cosmological problem for supergravity or superstring models, either by producing too much entropy when they decay, or by not decaying and leaving too much relic energy density in the Universe today. It is shown that the dilaton, axion, Polonyi and gravitino problems are essentially equivalent in a wide class of superstring models, and that no problems arise with cosmological nucleosynthesis if m3/2 >~ 104 GeV, or with baryosynthesis if m3/2 >~ 1013 GeV. If these problems are solved, shadow matter also decays harmlessly in the very early Universe. Attention is drawn to a class of phenomenological superstring models which avoid all these cosmological difficulties.
On leave of absence from Instituto de Estructura de la Materia, Serrano 119, 28006 Madrid, Spain.
Ellis John
Nanopoulos Dimitri V.
Quiros Mariano
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