On the gravity theories and cosmology from strings.

Details On the gravity theories and cosmology from strings. On the gravity theories and cosmology from strings.

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991nuphb.361..713c&link_type=abstract

Nuclear Physics B, Part. Phys., Vol. 361, No. 3, p. 713 - 728

Physics

Nuclear Physics

37

Scientific paper

The authors have studied the conformal properties and cosmological solutions of the four-dimensional gravitational action for different supersymmetric and non-supersymmetric string scenarios, assuming flat directions in the configuration space of moduli and dilaton fields. They have explicitly shown the equivalence between different conformal frames and chosen a preferred frame in which the relevant masses are constant. The theory of gravity for the radiation dominated era is general relativity. During the matter dominated era all analyzed examples are in conflict with the bounds on the time variation of gauge couplings and/or with the post-newtonian bounds of general relativity.

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