Journal Article

An extended excursion set approach to structure formation in chameleon models

Baojiu Li and George Efstathiou

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 2, pages 1431-1442
Published in print April 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI:
An extended excursion set approach to structure formation in chameleon models

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In attempts to explain dark energy, a number of models have been proposed in which the formation of a large-scale structure depends on the local environment. These models are highly non-linear and difficult to analyse analytically. N-body simulations have therefore been used to study their non-linear evolution. Here we extend excursion set theory to incorporate environmental effects on structure formation. We apply the method to a chameleon model and calculate observables such as the non-linear mass function at various redshifts. The method can be generalized to study other observables and other models of environmentally dependent interactions. The analytic methods described here should be proved to be useful in delineating which models deserve more detailed study with N-body simulations.

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

Journal Article.  8599 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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