Journal
MODERN PHYSICS LETTERS A
Volume 31, Issue 6, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217732316300056
Keywords
Dark matter; sterile neutrino; freeze-in
Categories
Funding
- Department of Energy [DE-SC0007879, DE-SC0011719]
- U.S. Department of Energy (DOE) [DE-SC0011719, DE-SC0007879] Funding Source: U.S. Department of Energy (DOE)
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A sterile neutrino is a well-motivated and widely studied dark matter (DM) candidate. The most straightforward realization of sterile neutrino DM, through the Dodelson-Widrow (DW) mechanism, is now ruled out by a combination of X-ray and Lymana measurements. An alternative production mechanism that is becoming increasingly popular in the literature is the freeze-in mechanism, involving frameworks where a feeble coupling to a particle - usually a scalar beyond the Standard Model - in the thermal bath results in a gradual accumulation of the sterile neutrino DM abundance. This paper reviews the various motivations for realizing such frameworks in the literature, their common characteristic features and phenomenological signatures.
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