Couplings of a Light Dilaton and Violations of the Equivalence Principle

Details Couplings of a Light Dilaton and Violations of the Equivalence Principle Couplings of a Light Dilaton and Violations of the Equivalence Principle

2000-08-11

arxiv.org/abs/hep-ph/0008116v1

JHEP 0008 (2000) 037

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages

Scientific paper

10.1088/1126-6708/2000/08/037

Experimental discovery of the dilaton would provide strong evidence for string theory. A light dilaton could show up in current tests of the inverse square law for gravity at sub-millimeter distances. In the large extra dimension scenario, Kaluza-Klein excitations of the dilaton can also contribute to the cooling of supernovae. In order to quantify these effects we compute the couplings of a low energy dilaton to matter. These predominantly arise from the fundamental dilaton coupling to the gluon field strength, which receives a sizable enhancement from QCD scaling. We show that detection of the dilaton will give a direct measurement of the QCD coupling constant at the string scale. Particular attention is paid to the size of equivalence principle violating dilaton couplings.

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