String theory and gravity

Details String theory and gravity String theory and gravity

1994-11-29

arxiv.org/abs/gr-qc/9411069v1

Gen.Rel.Grav. 26 (1994) 1171-1176

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, PLAIN TEX

Scientific paper

10.1007/BF02106709

It is pointed out that string-loop effects may generate matter couplings for the dilaton allowing this scalar partner of the tensorial graviton to stay massless while contributing to macroscopic gravity in a way naturally compatible with existing experimental data. Under a certain assumption of universality of the dilaton coupling functions (possibly realized through a discrete symmetry such as S-duality), the cosmological evolution drives the dilaton towards values where it decouples from matter. At the present cosmological epoch, the coupling to matter of the dilaton should be very small, but non zero. This provides a new motivation for improving the experimental tests of Einstein's Equivalence Principle.

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