Journal Article

Can early dark energy be detected in non-linear structure?*

Matthew J. Francis, Geraint F. Lewis and Eric V. Linder

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 394, issue 2, pages 605-614
Published in print April 2009 | ISSN: 0035-8711
Published online March 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14286.x
Can early dark energy be detected in non-linear structure?*

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We present the first study of early dark energy cosmologies using N-body simulations to investigate the formation of a non-linear structure. In contrast to expectations from semi-analytic approaches, we find that early dark energy does not imprint a unique signature on the statistics of non-linear structures. Investigating the non-linear power spectra and halo mass functions, we show that universal mass functions hold for early dark energy, making its presence difficult to distinguish from Λ cold dark matter. Since early dark energy biases the baryon acoustic oscillation scale, the lack of discriminating power is problematic.

Keywords: methods: N-body simulations; methods: numerical; dark matter; large-scale structure of Universe

Journal Article.  7735 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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