Abstract
Weakly interacting massive particles (WIMPs) constitute one of very few probes ofcosmology before big bang nucleosynthesis (BBN). We point out that in scenarios in whichthe Universe evolves in a non-standard manner during and after WIMP kineticdecoupling, the horizon mass scale at decoupling can be smaller and the darkmatter WIMPs can be colder than in standard cosmology. This would lead tomuch smaller first objects in hierarchical structure formation. In low reheatingtemperature scenarios the effect may be large enough to noticeably enhance indirectdetection signals in GLAST and other detectors, by up to two orders of magnitude.
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