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Title: keV sterile neutrino dark matter from singlet scalar decays: the most general case

Abstract

We investigate the early Universe production of sterile neutrino Dark Matter by the decays of singlet scalars. All previous studies applied simplifying assumptions and/or studied the process only on the level of number densities, which makes it impossible to give statements about cosmic structure formation. We overcome these issues by dropping all simplifying assumptions (except for one we showed earlier to work perfectly) and by computing the full course of Dark Matter production on the level of non-thermal momentum distribution functions. We are thus in the position to study a broad range of aspects of the resulting settings and apply a broad set of bounds in a reliable manner. We have a particular focus on how to incorporate bounds from structure formation on the level of the linear power spectrum, since the simplistic estimate using the free-streaming horizon clearly fails for highly non-thermal distributions. Our work comprises the most detailed and comprehensive study of sterile neutrino Dark Matter production by scalar decays presented so far.

Authors:
; ;  [1]
  1. Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München (Germany)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22572189
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2016; Journal Issue: 11; Other Information: PUBLISHER-ID: JCAP11(2016)038; OAI: oai:repo.scoap3.org:17994; cc-by Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMOLOGY; DISTRIBUTION FUNCTIONS; ENERGY SPECTRA; KEV RANGE; NONLUMINOUS MATTER; PARTICLE DECAY; PARTICLE PRODUCTION; UNIVERSE; STERILE NEUTRINOS

Citation Formats

König, Johannes, Merle, Alexander, and Totzauer, Maximilian. keV sterile neutrino dark matter from singlet scalar decays: the most general case. United States: N. p., 2016. Web. doi:10.1088/1475-7516/2016/11/038.
König, Johannes, Merle, Alexander, & Totzauer, Maximilian. keV sterile neutrino dark matter from singlet scalar decays: the most general case. United States. doi:10.1088/1475-7516/2016/11/038.
König, Johannes, Merle, Alexander, and Totzauer, Maximilian. Mon . "keV sterile neutrino dark matter from singlet scalar decays: the most general case". United States. doi:10.1088/1475-7516/2016/11/038.
@article{osti_22572189,
title = {keV sterile neutrino dark matter from singlet scalar decays: the most general case},
author = {König, Johannes and Merle, Alexander and Totzauer, Maximilian},
abstractNote = {We investigate the early Universe production of sterile neutrino Dark Matter by the decays of singlet scalars. All previous studies applied simplifying assumptions and/or studied the process only on the level of number densities, which makes it impossible to give statements about cosmic structure formation. We overcome these issues by dropping all simplifying assumptions (except for one we showed earlier to work perfectly) and by computing the full course of Dark Matter production on the level of non-thermal momentum distribution functions. We are thus in the position to study a broad range of aspects of the resulting settings and apply a broad set of bounds in a reliable manner. We have a particular focus on how to incorporate bounds from structure formation on the level of the linear power spectrum, since the simplistic estimate using the free-streaming horizon clearly fails for highly non-thermal distributions. Our work comprises the most detailed and comprehensive study of sterile neutrino Dark Matter production by scalar decays presented so far.},
doi = {10.1088/1475-7516/2016/11/038},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 11,
volume = 2016,
place = {United States},
year = {Mon Nov 21 00:00:00 EST 2016},
month = {Mon Nov 21 00:00:00 EST 2016}
}