Constraints on the Very Early Universe from Thermal WIMP Dark Matter

Details Constraints on the Very Early Universe from Thermal WIMP Dark Matter Constraints on the Very Early Universe from Thermal WIMP Dark Matter

2007-04-12

arxiv.org/abs/0704.1590v2

Phys.Rev.D76:103524,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 8 figures, comments added

Scientific paper

10.1103/PhysRevD.76.103524

We investigate the relic density n_\chi of non-relativistic long-lived or stable particles \chi in non-standard cosmological scenarios. We calculate the relic abundance starting from arbitrary initial temperatures of the radiation-dominated epoch, and derive the lower bound on the initial temperature T_0 \geq m_\chi/23, assuming that thermally produced \chi particles account for the dark matter energy density in the universe; this bound holds for all \chi annihilation cross sections. We also investigate cosmological scenarios with modified expansion rate. Even in this case an approximate formula similar to the standard one is capable of predicting the final relic abundance correctly. Choosing the \chi annihilation cross section such that the observed cold dark matter abundance is reproduced in standard cosmology, we constrain possible modifications of the expansion rate at T \sim m_\chi/20, well before Big Bang nucleosynthesis.

Affiliated with

Also associated with

No associations

Rating

Constraints on the Very Early Universe from Thermal WIMP Dark Matter 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 Constraints on the Very Early Universe from Thermal WIMP Dark Matter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraints on the Very Early Universe from Thermal WIMP Dark Matter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-148063