Non-linear Structure Formation in Cosmologies with Early Dark Energy

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dc.creatorBartelmann, Matthias
dc.creatorDoran, Michael
dc.creatorWetterich, Christof
dc.date2005-07-11
dc.date.accessioned2026-07-07T12:34:57Z
dc.date.available2026-07-07T12:34:57Z
dc.descriptionWe argue that a few per cent of "Early Dark Energy" can be detected by the statistics of nonlinear structures. The presence of Dark Energy during linear structure formation is natural in models where the present tiny Dark-Energy density is related to the age of the Universe rather than a new fundamental small parameter. Generalisation of the spherical collapse model shows that the linear collapse parameter delta_c is lowered. The corresponding relative enhancement of weak gravitational lensing on arc-minute scales lowers the value of sigma_8 inferred from a given lensing amplitude as compared to Lambda-CDM. In presence of Early Dark Energy, structures grow slower, such that for given sigma_8 the number of galaxies and galaxy clusters is substantially increased at moderate and high redshift. For realistic models, the number of clusters detectable through their thermal Sunyaev-Zel'dovich effect at redshift unity and above, e.g. with the Planck satellite, can be an order of magnitude larger than for Lambda-CDM.
dc.description10 pages, 12 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0507257
dc.identifierhttp://arxiv.org/abs/astro-ph/0507257
dc.identifierAstron.Astrophys.454:27-36,2006
dc.identifierdoi:10.1051/0004-6361:20053922
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/217622
dc.subjectAstrophysics
dc.titleNon-linear Structure Formation in Cosmologies with Early Dark Energy
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