Journal Article

Unmodified gravity

Fergus Simpson, Brendan Jackson and John A. Peacock

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 2, pages 1053-1058
Published in print February 2011 | ISSN: 0035-8711
Published online February 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17734.x
Unmodified gravity

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By relaxing the conventional assumption of a purely gravitational interaction between dark energy and dark matter, substantial alterations to the growth of cosmological structure can occur. In this work we focus on the homogeneous transfer of energy from a decaying form of dark energy. We present simple analytic solutions to the modified growth rates of matter fluctuations in these models, and demonstrate that neglecting physics within the dark sector may induce a significant bias in the inferred growth rate, potentially offering a false signature of modified gravity.

Keywords: cosmology: theory; dark energy; dark matter; large-scale structure of Universe

Journal Article.  3309 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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