Gravity from superstrings

Details Gravity from superstrings Gravity from superstrings

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991nuphs..22..104q&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 22, Issue 1, p. 104-114.

Physics

Nuclear Physics

Scientific paper

We discuss the four-dimensional theory of gravity which arises from compactifications of the heterotic string. Its main feature is that the dilaton field is coupled to all non-gravitational matter in the Universe. Its cosmological solutions correspond to General Relativity or departures therefrom given by a JBD-like theory labelled by an ω~-parameter. Unlike in ordinary JBD gravity (where the scalar field is decoupled from the non-gravitational sector), bounds on the time variation of the gauge coupling constants provide very strong constraints on ω~. In particular data from the Oklo reactor translate into ω~ > 1015.

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