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Cosmic structure growth and dark energy

Linder, E.V.; Jenkins, A.R.

Authors

E.V. Linder



Abstract

Dark energy has a dramatic effect on the dynamics of the Universe, causing the recently discovered acceleration of the expansion. The dynamics are also central to the behaviour of the growth of large-scale structure, offering the possibility that observations of structure formation provide a sensitive probe of the cosmology and dark energy characteristics. In particular, dark energy with a time-varying equation of state can have an influence on structure formation stretching back well into the matter-dominated epoch. We analyse this impact, first calculating the linear perturbation results, including those for weak gravitational lensing. These dynamical models possess definite observable differences from constant equation of state models. Then we present a large-scale numerical simulation of structure formation, including the largest volume to date involving a time-varying equation of state. We find the halo mass function is well described by the Jenkins et al. mass function formula. We also show how to interpret modifications of the Friedmann equation in terms of a time-variable equation of state. The results presented here provide steps toward realistic computation of the effect of dark energy in cosmological probes involving large-scale structure, such as cluster counts, the Sunyaev–Zel'dovich effect or weak gravitational lensing.

Citation

Linder, E., & Jenkins, A. (2003). Cosmic structure growth and dark energy. Monthly Notices of the Royal Astronomical Society, 346(2), 573-583. https://doi.org/10.1046/j.1365-2966.2003.07112.x

Journal Article Type Article
Publication Date 2003-12
Deposit Date Apr 28, 2008
Publicly Available Date Apr 28, 2008
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 346
Issue 2
Pages 573-583
DOI https://doi.org/10.1046/j.1365-2966.2003.07112.x
Keywords Gravitation methods, Numerical cosmological parameters.
Public URL https://durham-repository.worktribe.com/output/1591905

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