A new bound on the low reheating temperature with dark matter

Abstract

We investigate a new bound on the low reheating temperature in a scenario where the Universe experiences early matter-domination before reheating after which the standard big bang cosmology begins. In many models of dark matter (DM), the small scale fluctuations of DM grow during the early matter-domination era and seed the formation of the ultracompact minihalos (UCMHs). Using the constraints on the number of UCMHs from gamma-ray observations, we find a lower bound on the reheating temperature between $\mathcal{O}(10)\mathrm{MeV}-\mathcal{O}(100)\mathrm{MeV}$ for WIMP dark matter depending on the nature of DM. A similar bound could be obtained for non-WIMP dark matter by observing UCMHs gravitationally such as pulsar timing, microlensing and so on in some future observations.

5 pages, 2 figures

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• Axion Cosmology with Early Matter Domination
• 3D simulations with boosted primordial power spectra and ultracompact minihalos
• Concentrated Dark Matter: Enhanced Small-scale Structure from Co-Decaying Dark Matter
• Sterile Neutrino Dark Matter in Left-Right Theories
• Dark matter cooling during early matter-domination boosts sub-earth halos
• (P)reheating Effects of the Kähler Moduli Inflation I Model