Boosted neutrinos and relativistic dark particles as messengers from reheating

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Usually information from early eras such as reheating is hard to come by. In this paper we argue that, given the right circumstances, right-handed sterile neutrinos decaying to left-handed active ones at relatively late times can carry information from reheating by propagating freely over the thermal history. For not too small mixing angles, suitable right-handed neutrino masses are around O(MeV-GeV). We identify the typical spectra and argue that they provide information on the ratio of the inflaton mass to the reheating temperature. This primordial neutrino signal can be strong enough that it can be detected in IceCube. More speculatively, for a reheating temperature and inflaton mass satisfying T-R = O(1-100) MeV, and m(phi) = O(10(16-19)) GeV they may even explain the observed PeV events. Also more general relativistic dark particles can play the role of such messengers, potentially not only allowing for the PeV events but also alleviating the H-0-tension.
Publisher
IOP PUBLISHING LTD
Issue Date
2021-02
Language
English
Article Type
Article
Citation

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, no.2

ISSN
1475-7516
DOI
10.1088/1475-7516/2021/02/044
URI
http://hdl.handle.net/10203/282165
Appears in Collection
RIMS Journal Papers
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