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Dark matter with density-dependent interactions

Boddy, Kimberly K. and Carroll, Sean M. and Trodden, Mark (2012) Dark matter with density-dependent interactions. Physical Review D, 86 (12). Art. No. 123529. ISSN 2470-0010. doi:10.1103/PhysRevD.86.123529.

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The decay and annihilation cross sections of dark matter particles may depend on the value of a chameleonic scalar field that both evolves cosmologically and takes different values depending on the local matter density. This possibility introduces a separation between the physics relevant for freeze-out and that responsible for dynamics and detection in the late universe. We investigate how such dark sector interactions might be implemented in a particle physics Lagrangian and consider how current and upcoming observations and experiments bound such dark matter candidates. A specific simple model allows for an increase in the annihilation cross section by a factor of 10^6 between freeze-out and today, while more complicated models should also allow for scattering cross sections near the astrophysical bounds.

Item Type:Article
Related URLs:
URLURL TypeDescription
Boddy, Kimberly K.0000-0003-1928-4667
Carroll, Sean M.0000-0002-4226-5758
Additional Information:© 2012 American Physical Society. Received 31 August 2012; published 28 December 2012. We use MATHEMATICA 8 to numerically solve the Boltzmann equation, JAXODRAW 2.1-0 [54,55] to create the Feynman diagrams, and FeynCalc [56] to calculate the 1-loop A decays.We would like to acknowledge helpful discussions with Matt Buckley, Katie Freese, Koji Ishiwata, Justin Khoury, and Mark Wise. This work was supported in part by the Department of Energy, the National Science Foundation, NASA, and the Gordon and Betty Moore Foundation.
Group:Caltech Theory, Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:12
Classification Code:PACS: 95.35.+d
Record Number:CaltechAUTHORS:20130131-161047251
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36725
Deposited On:01 Feb 2013 15:37
Last Modified:09 Nov 2021 23:24

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