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Scattering, damping, and acoustic oscillations: Simulating the structure of dark matter halos with relativistic force carriers

Buckley, Matthew R. and Zavala, Jesús and Cyr-Racine, Francis-Yan and Sigurdson, Kris and Vogelsberger, Mark (2014) Scattering, damping, and acoustic oscillations: Simulating the structure of dark matter halos with relativistic force carriers. Physical Review D, 90 (4). Art. No. 043524. ISSN 1550-7998. http://resolver.caltech.edu/CaltechAUTHORS:20141205-093137355

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Abstract

We demonstrate that self-interacting dark matter models with interactions mediated by light particles can have significant deviations in the matter power spectrum and detailed structure of galactic halos when compared to a standard cold dark matter scenario. While these deviations can take the form of suppression of small-scale structure that are in some ways similar to that of warm dark matter, the self-interacting models have a much wider range of possible phenomenology. A long-range force in the dark matter can introduce multiple scales to the initial power spectrum, in the form of dark acoustic oscillations and an exponential cutoff in the power spectrum. Using simulations we show that the impact of these scales can remain observationally relevant up to the present day. Furthermore, the self-interaction can continue to modify the small-scale structure of the dark matter halos, reducing their central densities and creating a dark matter core. The resulting phenomenology is unique to these type of models.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.90.043524DOIArticle
http://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.043524PublisherArticle
http://arxiv.org/abs/1405.2075arXivDiscussion Paper
ORCID:
AuthorORCID
Sigurdson, Kris0000-0002-6729-0765
Additional Information:© 2014 American Physical Society. Received 28 May 2014; published 20 August 2014. M. R. B. would like to thank Alyson Brooks for useful discussion and comments. M. R. B. and J. Z. thank the Aspen Center for Physics, where the initial conversations that led to their interest in this project were held. The Aspen Center for Physics is supported by the National Science Foundation under Grant No. 1066293. 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. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The research of K. S. is supported in part by a National Science and Engineering Research Council (NSERC) of Canada Discovery Grant. The Dark Cosmology Centre is funded by the DNRF. J. Z. is supported by the EU under a Marie Curie International Incoming Fellowship, Contract No. PIIF-GA-2013-627723. The simulations in this paper were carried out on the Gardar supercomputer supported by the Nordic High Performance Computing (NHPC).
Group:Keck Institute for Space Studies
Funders:
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Marie Curie FellowshipPIIF-GA-2013-627723
NSFPHY-1066293
W. M. Keck FoundationUNSPECIFIED
NASAUNSPECIFIED
Danish National Research FoundationUNSPECIFIED
Keck Institute for Space Studies (KISS)UNSPECIFIED
Classification Code:PACS numbers: 98.80.-k, 95.35.+d
Record Number:CaltechAUTHORS:20141205-093137355
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141205-093137355
Official Citation:Buckley, M. R., Zavala, J., Cyr-Racine, F.-Y., Sigurdson, K., & Vogelsberger, M. (2014). Scattering, damping, and acoustic oscillations: Simulating the structure of dark matter halos with relativistic force carriers. Physical Review D, 90(4), 043524.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52426
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:05 Dec 2014 20:58
Last Modified:04 May 2017 19:42

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