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New interactions in the dark sector mediated by dark energy

Brookfield, A.W., van de Bruck, C. and Hall, L.M.H. (2008) New interactions in the dark sector mediated by dark energy. Physical Review D , 77 (4). Art. No. 043006. ISSN 1550-2368

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Abstract

Cosmological observations have revealed the existence of a dark matter sector, which is commonly assumed to be made up of one particle species only. However, this sector might be more complicated than we currently believe: there might be more than one dark matter species (for example, two components of cold dark matter or a mixture of hot and cold dark matter) and there may be new interactions between these particles. In this paper we study the possibility of multiple dark matter species and interactions mediated by a dark energy field. We study both the background and the perturbation evolution in these scenarios. We find that the background evolution of a system of multiple dark matter particles (with constant couplings) mimics a single fluid with a time-varying coupling parameter. However, this is no longer true on the perturbative level. We study the case of attractive and repulsive forces as well as a mixture of cold and hot dark matter particles.

Item Type: Article
Copyright, Publisher and Additional Information: © 2008 The American Physical Society. This is an author produced version of a paper published in 'Physical Review D'. Uploaded in accordance with the publisher's self-archiving policy.
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User: Mrs Megan Hobbs
Date Deposited: 24 Mar 2010 15:22
Last Modified: 08 Feb 2013 17:00
Published Version: http://dx.doi.org/10.1103/PhysRevD.77.043006
Status: Published
Publisher: American Physical Society
Refereed: Yes
Identification Number: 10.1103/PhysRevD.77.043006
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/10567

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