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Testing dark matter clustering with redshift space distortions

Title
Testing dark matter clustering with redshift space distortions
Authors
Linder E.V.
Ewha Authors
Eric V. Linder
Issue Date
2013
Journal Title
Journal of Cosmology and Astroparticle Physics
ISSN
1475-7516JCR Link
Citation
vol. 2013, no. 4
Indexed
SCIE; SCOPUS WOS scopus
Abstract
The growth rate of large scale structure can probe whether dark matter clusters at gravitational strength or deviates from this, e.g. due to self interactions. Measurement of the growth rate through redshift space distortions in galaxy redshift surveys constrains the clustering strength, and its redshift dependence. We compare such effects on growth to those from high redshift deviations (e.g. early dark energy) or modified gravity, and give a simple, highly accurate analytic prescription. Current observations can constrain the dark matter clustering strength to Fcl = 0.99±0.02 of standard, if all other parameters are held fixed, but substantial covariances exist. Future galaxy redshift surveys may constrain an evolving clustering strength to 28%, marginalizing over the other parameters, or 4% if the dark energy parameters are held fixed while fitting for dark matter growth. Tighter constraints on the nature of dark matter could be obtained by combining cosmological and astrophysical probes. © 2013 IOP Publishing Ltd and Sissa Medialab srl.
DOI
10.1088/1475-7516/2013/04/031
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자연과학대학 > 물리학전공 > Journal papers
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