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Resonant sterile neutrino dark matter in the local and high-z Universe

Bozek, Brandon and Boylan-Kolchin, Michael and Horiuchi, Shunsaku and Garrison-Kimmel, Shea and Abazajian, Kevork and Bullock, James S. (2016) Resonant sterile neutrino dark matter in the local and high-z Universe. Monthly Notices of the Royal Astronomical Society, 459 (2). pp. 1489-1504. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20160707-091503128

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Abstract

Sterile neutrinos comprise an entire class of dark matter models that, depending on their production mechanism, can be hot, warm, or cold dark matter (CDM). We simulate the Local Group and representative volumes of the Universe in a variety of sterile neutrino models, all of which are consistent with the possible existence of a radiative decay line at ∼3.5 keV. We compare models of production via resonances in the presence of a lepton asymmetry (suggested by Shi & Fuller 1999) to ‘thermal’ models. We find that properties in the highly non-linear regime – e.g. counts of satellites and internal properties of haloes and subhaloes – are insensitive to the precise fall-off in power with wavenumber, indicating that non-linear evolution essentially washes away differences in the initial (linear) matter power spectrum. In the quasi-linear regime at higher redshifts, however, quantitative differences in the 3D matter power spectra remain, raising the possibility that such models can be tested with future observations of the Lyman-α forest. While many of the sterile neutrino models largely eliminate multiple small-scale issues within the CDM paradigm, we show that these models may be ruled out in the near future via discoveries of additional dwarf satellites in the Local Group.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/mnras/stw688DOIArticle
http://mnras.oxfordjournals.org/content/459/2/1489PublisherArticle
http://arxiv.org/abs/1512.04544arXivDiscussion Paper
ORCID:
AuthorORCID
Boylan-Kolchin, Michael0000-0002-9604-343X
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 March 21. Received 2016 March 19; in original form 2015 December 14. First published online March 23, 2016. We thank Tejaswi Venumadhav and Francis-Yan Cyr-Racine for useful discussions. The authors acknowledge the University of Maryland supercomputing resources (http://www.it.umd.edu/hpcc) made available for conducting the research reported in this paper. MBK acknowledges support from NASA through Hubble Space Telescope theory grants (programmes AR-12836 and AR-13888) from the Space Telescope Science Institute (STScI), which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555. Support for SGK was provided by NASA through Einstein Postdoctoral Fellowship grant number PF5-160136 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060. KNA is partially supported by NSF CAREER Grant no. PHY-11-59224 and NSF Grant no. PHY-1316792.
Group:TAPIR
Funders:
Funding AgencyGrant Number
NASA Hubble FellowshipAR-12836
NASA Hubble FellowshipAR-13888
NASANAS5-26555
NASA Einstein FellowshipPF5-160136
NASANAS8-03060
NSFPHY-11-59224
NSFPHY-1316792
Subject Keywords:Galaxy: halo – Local Group – cosmology: theory – dark matter – large-scale structure of Universe
Record Number:CaltechAUTHORS:20160707-091503128
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160707-091503128
Official Citation:Brandon Bozek, Michael Boylan-Kolchin, Shunsaku Horiuchi, Shea Garrison-Kimmel, Kevork Abazajian, and James S. Bullock Resonant sterile neutrino dark matter in the local and high-z Universe MNRAS (June 21, 2016) Vol. 459 1489-1504 doi:10.1093/mnras/stw688 first published online March 23, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68883
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Jul 2016 19:35
Last Modified:21 Sep 2017 22:40

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