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Dark-matter decays and self-gravitating halos

Peter, Annika H. G. and Moody, Christopher E. and Kamionkowski, Marc (2010) Dark-matter decays and self-gravitating halos. Physical Review D, 81 (10). Art. No. 103501. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:20100624-142330707

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Abstract

We consider models in which a dark-matter particle decays to a slightly less massive daughter particle and a noninteracting massless particle. The decay gives the daughter particle a small velocity kick. Self-gravitating dark-matter halos that have a virial velocity smaller than this velocity kick may be disrupted by these particle decays, while those with larger virial velocities will be heated. We use numerical simulations to follow the detailed evolution of the total mass and density profile of self-gravitating systems composed of particles that undergo such velocity kicks as a function of the kick speed (relative to the virial velocity) and the decay time (relative to the dynamical time). We show how these decays will affect the halo mass-concentration relation and mass function. Using measurements of the halo mass-concentration relation and galaxy-cluster mass function to constrain the lifetime–kick-velocity parameter space for decaying dark matter, we find roughly that the observations rule out the combination of kick velocities greater than 100  km s^(-1) and decay times less than a few times the age of the Universe.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.81.103501 DOIUNSPECIFIED
http://prd.aps.org/abstract/PRD/v81/i10/e103501PublisherUNSPECIFIED
Additional Information:© 2010 The American Physical Society. Received 1 March 2010; published 3 May 2010. We thank Andrew Benson for helpful discussions. This work was supported at Caltech by DOE Grant No. DEFG03- 92-ER40701 and the Gordon and Betty Moore Foundation.
Group:TAPIR
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-92-ER40701
Gordon and Betty Moore Foundation UNSPECIFIED
Classification Code:PACS: 95.35.+d
Record Number:CaltechAUTHORS:20100624-142330707
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100624-142330707
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18804
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Jul 2010 22:01
Last Modified:26 Dec 2012 12:10

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