Dilatonic Dark Matter

Abstract

We study the possibility that the dilaton plays the role of the dark matter of the universe. We find that the condition for the dilaton to be the dark matter of the universe 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.

12 pages, 1 figure. Published in Mod. Phys. Lett A13 (1998) 109-117. This essay received an "honorable mention" from the Gravity Research Foundation, 1997

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• An Alternative Interpretation for the Moduli Fields of the Cosmology Associated to Type IIB Supergravity with Fluxes
• Cancellation of linearised axion-dilaton self interaction divergence in strings
• Distinguishing between dark-matter interactions with gravitational-wave detectors