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Constraints on large-scale dark acoustic oscillations from cosmology

Cyr-Racine, Francis-Yan and de Putter, Roland and Raccanelli, Alvise and Sigurdson, Kris (2014) Constraints on large-scale dark acoustic oscillations from cosmology. Physical Review D, 89 (6). Art. No. 063517. ISSN 1550-7998. doi:10.1103/PhysRevD.89.063517.

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If all or a fraction of the dark matter (DM) were coupled to a bath of dark radiation (DR) in the early Universe, we expect the combined DM-DR system to give rise to acoustic oscillations of the dark matter until it decouples from the DR. Much like the standard baryon acoustic oscillations, these dark acoustic oscillations (DAO) imprint a characteristic scale, the sound horizon of dark matter, on the matter power spectrum. We compute in detail how the microphysics of the DM-DR interaction affects the clustering of matter in the Universe and show that the DAO physics also gives rise to unique signatures in the temperature and polarization spectra of the cosmic microwave background (CMB). We use cosmological data from the CMB, baryon acoustic oscillations, and large-scale structure to constrain the possible fraction of interacting DM as well as the strength of its interaction with DR. Like nearly all knowledge we have gleaned about DM since inferring its existence this constraint rests on the betrayal by gravity of the location of otherwise invisible DM. Although our results can be straightforwardly applied to a broad class of models that couple dark matter particles to various light relativistic species, in order to make quantitative predictions, we model the interacting component as dark atoms coupled to a bath of dark photons. We find that linear cosmological data and CMB lensing put strong constraints on the existence of DAO features in the CMB and the large-scale structure of the Universe. Interestingly, we find that at most ∼5% of all DM can be very strongly interacting with DR. We show that our results are surprisingly constraining for the recently proposed double-disk DM model, a novel example of how large-scale precision cosmological data can be used to constrain galactic physics and subgalactic structure.

Item Type:Article
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URLURL TypeDescription Paper
Cyr-Racine, Francis-Yan0000-0002-7939-2988
Sigurdson, Kris0000-0002-6729-0765
Additional Information:© 2014 American Physical Society. Received 23 October 2013; published 17 March 2014. We thank JiJi Fan, Andrey Katz, Lisa Randall, Matthew Reece, and Manoj Kaplinghat for useful discussions. We further thank Abhilash Mishra, Marius Millea, and Matthew Reece for insightful comments on an earlier version of this draft. We are also grateful to Olga Mena and Shun Saito for generously providing an initial version of the code for the BOSS galaxy power spectrum likelihood. This work 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. F.-Y. C.-R. acknowledges support from the W. M. Keck Institute for Space Studies Postdoctoral Fellow program. The research of K. S. is supported in part by a National Science and Engineering Research Council (NSERC) of Canada Discovery Grant. F.-Y. C.-R. and K. S. thank the Aspen Center for Physics, where part of this work was completed, for their hospitality. This research was supported in part by the National Science Foundation under Grant No. NSF PHY11-25915. 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. Part of this work is supported by NASA ATP Grant No. 11-ATP-090.
Group:Keck Institute for Space Studies
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Keck Institute for Space Studies (KISS)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Issue or Number:6
Classification Code:PACS: 98.80.-k
Record Number:CaltechAUTHORS:20140421-104333048
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Official Citation:Cyr-Racine, F.-Y., de Putter, R., Raccanelli, A., & Sigurdson, K. (2014). Constraints on large-scale dark acoustic oscillations from cosmology. Physical Review D, 89(6), 063517.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45068
Deposited On:23 Apr 2014 14:33
Last Modified:10 Nov 2021 16:59

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