Unmodified Gravity

Details Unmodified Gravity Unmodified Gravity

2010-04-12

arxiv.org/abs/1004.1920v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 5 figures, new eq (7), changes reflect published version

Scientific paper

10.1111/j.1365-2966.2010.17734.x

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.

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