Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 11, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2020/11/038
Keywords
cosmology of theories beyond the SM; particle physics - cosmology connection; physics of the early universe; inflation
Funding
- DoE Early Career Grant [DE-SC0019225]
- DoE grant [DE-SC0009988]
- Raymond and Beverly Sackler Foundation
- U.S. Department of Energy (DOE) [DE-SC0019225, DE-SC0009988] Funding Source: U.S. Department of Energy (DOE)
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Reheating is a process where the energy density of a dominant component of the universe other than radiation, such as a matter component, is transferred into radiation. It is usually assumed that the temperature of the universe decreases due to cosmic expansion even during the reheating process, in which case the maximal temperature of the universe is much higher than the reheat temperature. We point out that the temperature of the universe during reheating may in fact increase in well-motivated scenarios. We derive the necessary conditions for the temperature to increase during reheating and discuss concrete examples involving a scalar field. We comment on implications for particle physics and cosmology due to an increasing temperature during reheating.
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