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Galilean Equivalence for Galactic Dark Matter

Kesden, Michael and Kamionkowski, Marc (2006) Galilean Equivalence for Galactic Dark Matter. Physical Review Letters, 97 (13). Art. No. 131303. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:KESprl06

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Abstract

Satellite galaxies are tidally disrupted as they orbit the Milky Way. If dark matter (DM) experiences a stronger self-attraction than baryons, stars will preferentially gain rather than lose energy during tidal disruption, leading to an enhancement in the trailing compared to the leading tidal stream. The Sgr dwarf galaxy is seen to have roughly equal streams, challenging models in which DM and baryons accelerate differently by more than 10%. Future observations and a better understanding of DM distribution should allow detection of equivalence violation at the percent level.


Item Type:Article
ORCID:
AuthorORCID
Kamionkowski, Marc0000-0001-7018-2055
Additional Information:© 2006 The American Physical Society (Received 22 June 2006; revised 2 August 2006; published 28 September 2006) We wish to thank John Dubinski and Larry Widrow for assistance with the use of GALACTICS and Pat McDonanld, Neal Dalal, Christoph Pfrommer, and Jonathan Sievers for useful conversations. All computations were performed on CITA’s McKenzie cluster [29], which was funded by the Canada Foundation for Innovation and the Ontario Innovation Trust. Kesden acknowledges support from the NASA Graduate Research Program, and NSERC of Canada. Kamionkowski acknowledges support from the DoE No. DE-FG03-92-ER40701, NASA No. NNG05GF69G, and the Gordon and Betty Moore Foundation.
Group:Moore Center for Theoretical Cosmology and Physics
Funders:
Funding AgencyGrant Number
NASA Graduate Student Research FellowshipUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Department of Energy (DOE)DE-FG03-92-ER40701
NASANNG05GF69G
Gordon and Betty Moore FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:KESprl06
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KESprl06
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.97.131303
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5500
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:20 Oct 2006
Last Modified:11 Dec 2016 00:37

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