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MeV dark matter and small scale structure

Hooper, Dan and Kaplinghat, Manoj and Strigari, Louis E. and Zurek, Kathryn M. (2007) MeV dark matter and small scale structure. Physical Review D, 76 (10). Art. No. 103515. ISSN 1550-7998. doi:10.1103/physrevd.76.103515.

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Weakly interacting massive particles with electroweak scale masses (neutralinos, etc.) remain in kinetic equilibrium with other particle species until temperatures approximately in the range of 10 MeV to 1 GeV, leading to the formation of dark matter substructure with masses as small as 10^(−4) M_⊙ to 10^(−12) M_⊙. However, if dark matter consists of particles with MeV scale masses, as motivated by the observation of 511 keV emission from the galactic bulge, such particles are naturally expected to remain in kinetic equilibrium with the cosmic neutrino background until considerably later times. This would lead to a strong suppression of small scale structure with masses below about 10^7 M_⊙ to 10^4 M_⊙. This cutoff scale has important implications for present and future searches for faint local group satellite galaxies and for the missing satellites problem. We also summarize current constraints on the MeV dark matter scenario.

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Additional Information:© 2007 American Physical Society. (Received 1 May 2007; published 8 November 2007) We thank John Beacom for discussions on this topic. This work has been supported by the U.S. Department of Energy, including Grant No. DE-FG02-95ER40896, and by NASA Grant No. NAG5-10842, and by NSF Grants No. AST-0607746 and No. PHY-0555689. We acknowledge the Aspen center for Physics where this work was initiated.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-95ER40896
Issue or Number:10
Classification Code:PACS numbers: 95.35.+d, 98.35.Gi, 98.62.Gq
Record Number:CaltechAUTHORS:20190611-125826689
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96286
Deposited By: George Porter
Deposited On:12 Jun 2019 17:31
Last Modified:16 Nov 2021 17:19

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