1 research outputs found
Ultra-cold WIMPs: relics of non-standard pre-BBN cosmologies
Weakly interacting massive particles (WIMPs) are one of very few probes of
cosmology before Big Bang nucleosynthesis (BBN). We point out that in scenarios
in which the Universe evolves in a non-standard manner during and after WIMP
kinetic decoupling, the horizon mass scale at decoupling can be smaller and the
dark matter WIMPs can be colder than in standard cosmology. This would lead to
much smaller first objects in hierarchical structure formation. In low
reheating temperature scenarios the effect may be large enough as to noticeably
enhance indirect detection signals in GLAST and other detectors, by up to two
orders of magnitude.Comment: Six pages, one figure- Extensive additions and rewriting with respect
to v1. Figure change