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ETHOS – an effective theory of structure formation: dark matter physics as a possible explanation of the small-scale CDM problems

Vogelsberger, Mark and Zavala, Jesús and Cyr-Racine, Francis-Yan and Pfrommer, Christoph and Bringmann, Torsten and Sigurdson, Kris (2016) ETHOS – an effective theory of structure formation: dark matter physics as a possible explanation of the small-scale CDM problems. Monthly Notices of the Royal Astronomical Society, 460 (2). pp. 1399-1416. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20160909-141723682

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Abstract

We present the first simulations within an effective theory of structure formation (ETHOS), which includes the effect of interactions between dark matter and dark radiation on the linear initial power spectrum and dark matter self-interactions during non-linear structure formation. We simulate a Milky Way-like halo in four different dark matter models and the cold dark matter case. Our highest resolution simulation has a particle mass of 2.8 × 10^4 M_⊙ and a softening length of 72.4 pc. We demonstrate that all alternative models have only a negligible impact on large-scale structure formation. On galactic scales, however, the models significantly affect the structure and abundance of subhaloes due to the combined effects of small-scale primordial damping in the power spectrum and late-time self-interactions. We derive an analytic mapping from the primordial damping scale in the power spectrum to the cutoff scale in the halo mass function and the kinetic decoupling temperature. We demonstrate that certain models within this extended effective framework that can alleviate the too-big-to-fail and missing satellite problems simultaneously, and possibly the core-cusp problem. The primordial power spectrum cutoff of our models naturally creates a diversity in the circular velocity profiles, which is larger than that found for cold dark matter simulations. We show that the parameter space of models can be constrained by contrasting model predictions to astrophysical observations. For example, some models may be challenged by the missing satellite problem if baryonic processes were to be included and even oversolve the too-big-to-fail problem; thus ruling them out.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/mnras/stw1076DOIArticle
http://mnras.oxfordjournals.org/content/460/2/1399.fullPublisherArticle
http://arxiv.org/abs/1512.05349arXivDiscussion Paper
ORCID:
AuthorORCID
Pfrommer, Christoph0000-0002-7275-3998
Sigurdson, Kris0000-0002-6729-0765
Additional Information:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 May 4. Received 2016 April 28. In original form 2015 December 21. First published online May 6, 2016. We thank Michael Boylan-Kolchin, Federico Marinacci for useful comments, and Volker Springel for giving us access to arepo. The simulations were performed on the joint MIT-Harvard computing cluster supported by MKI and FAS. MV acknowledges support through an MIT RSC award. The Dark Cosmology Centre is funded by the DNRF. JZ is supported by the EU under a Marie Curie International Incoming Fellowship, contract PIIF-GA-2013-62772. KS gratefully acknowledges support from the Friends of the Institute for Advanced Study. The research of KS is supported in part by a National Science and Engineering Research Council (NSERC) of Canada Discovery Grant. F-Y C-R acknowledges the support of the National Aeronautical and Space Administration ATP grant 14-ATP14- 0018 at Harvard University. The work of F-Y C-R was performed in part at the California Institute of Technology for the Keck Institute for Space Studies, which is funded by the W. M. Keck Foundation. CP gratefully acknowledges the support of the Klaus Tschira Foundation.
Funders:
Funding AgencyGrant Number
Harvard UniversityUNSPECIFIED
Massachusetts Institute of Technology (MIT)UNSPECIFIED
Danish National Research FoundationUNSPECIFIED
Marie Curie FellowshipPIIF-GA-2013-62772
Institute for Advanced StudyUNSPECIFIED
National Science and Engineering Research Council of Canada (NSERC)UNSPECIFIED
NASA14-ATP14- 0018
W. M. Keck FoundationUNSPECIFIED
Klaus Tschira FoundationUNSPECIFIED
Subject Keywords:methods: numerical galaxies: haloes dark matter
Record Number:CaltechAUTHORS:20160909-141723682
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160909-141723682
Official Citation:Mark Vogelsberger, Jesús Zavala, Francis-Yan Cyr-Racine, Christoph Pfrommer, Torsten Bringmann, and Kris Sigurdson ETHOS – an effective theory of structure formation: dark matter physics as a possible explanation of the small-scale CDM problems MNRAS (August 01, 2016) Vol. 460 1399-1416 doi:10.1093/mnras/stw1076 first published online May 6, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70258
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:09 Sep 2016 23:51
Last Modified:28 Nov 2017 23:48

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