Constraints on the Very Early Universe from Thermal WIMP Dark Matter

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dc.creatorDrees, Manuel
dc.creatorIminniyaz, Hoernisa
dc.creatorKakizaki, Mitsuru
dc.date2007-04-12
dc.date2007-11-16
dc.date.accessioned2026-07-07T10:59:32Z
dc.date.available2026-07-07T10:59:32Z
dc.descriptionWe investigate the relic density n_χof non-relativistic long-lived or stable particles χin 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_χ/23, assuming that thermally produced χparticles account for the dark matter energy density in the universe; this bound holds for all χannihilation 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 χannihilation 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_χ/20, well before Big Bang nucleosynthesis.
dc.description23 pages, 8 figures, comments added
dc.identifierhttps://arxiv.org/abs/0704.1590
dc.identifierhttp://arxiv.org/abs/0704.1590
dc.identifierPhys.Rev.D76:103524,2007
dc.identifierdoi:10.1103/PhysRevD.76.103524
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187432
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleConstraints on the Very Early Universe from Thermal WIMP Dark Matter
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