Dilaton dominance in the early Universe dilutes Dark Matter relic abundances

Details Dilaton dominance in the early Universe dilutes Dark Matter relic abundances Dilaton dominance in the early Universe dilutes Dark Matter relic abundances

2011-02-21

arxiv.org/abs/1102.4277v3

Phys.Rev.D83:103523,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, Latex, 4 figures: Comments and references added, version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.83.103523

The role of the dilaton field and its coupling to matter may result to a dilution of Dark Matter (DM) relic densities. This is to be contrasted with quintessence scenarios in which relic densities are augmented, due to modification of the expansion rate, since Universe is not radiation dominated at DM decoupling. Dilaton field, besides this, affects relic densities through its coupling to dust which tends to decrease relic abundances. Thus two separate mechanisms compete each other resulting, in general, to a decrease of the relic density. This feature may be welcome and can rescue the situation if Direct Dark Matter experiments point towards small neutralino-nucleon cross sections, implying small neutralino annihilation rates and hence large relic densities, at least in the popular supersymmetric scenarios. In the presence of a diluting mechanism both experimental constraints can be met. The role of the dilaton for this mechanism has been studied in the context of the non-critical string theory but in this work we follow a rather general approach assuming that the dilaton dominates only at early eras long before Big Bang Nucleosynthesis.

Affiliated with

Also associated with

No associations

Rating

Dilaton dominance in the early Universe dilutes Dark Matter relic abundances does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dilaton dominance in the early Universe dilutes Dark Matter relic abundances, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dilaton dominance in the early Universe dilutes Dark Matter relic abundances will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-520982