paper

Dilatonic Dark Matter and Unified Cosmology -- a New Paradigm --

arXiv:hep-ph/9810372 · doi:10.1088/0264-9381/15/4/013

Abstract

We study the possibility that the dilaton -- the fundamental scalar field which exists in all the existing unified field theories -- plays the role of the dark matter of the universe. We find that the condition for the dilaton to be the dark matter strongly restricts its mass to be around 0.5 keV or 270 MeV. For the other mass ranges, the dilaton either undercloses or overcloses the universe. The 0.5 keV dilaton has the free-streaming distance of about 1.4 Mpc and becomes an excellent candidate of a warm dark matter, while the 270 MeV one has the free-streaming distance of about 7.4 pc and becomes a cold dark matter. We discuss the possible ways to detect the dilaton experimentally

19 pages, 5 figure, Talk given at the IIth RESCEU International Symposium on Dark Matter in the Universe and its Direct Detections, 1996. Proceedings published by Academic Press, Tokyo, edited by K sato

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