String theory and gravity |
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Authors: | T Damour A M Polyakov |
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Institution: | (1) Institut des Hautes Etudes Scientifiques, 91440 Bures-sur-Yvette, France;(2) Physics Department, Princeton University, 08544 Princeton, New Jersey, USA |
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Abstract: | 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, 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.This essay received the first award from the Gravity Research Foundation, 1994-Ed. |
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