English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We derive a non-perturbative, closed, analytic equation for the non-linearpower spectrum of cosmic density fluctuations. This result is based on ourkinetic field theory (KFT) of cosmic structure formation and on evaluatingparticle interactions in the Born approximation. At redshift zero, relativedeviations between our analytic result and typical numerical results are ~ 15 %on average up to wave numbers of k <= 10 h/Mpc. The theory underlying ouranalytic equation is fully specified once the statistical properties of theinitial density and momentum fluctuations are set. It has no further adjustableparameters. Apart from this equation, our main result is that thecharacteristic non-linear deformations of the power spectrum at late cosmictimes are determined by the initial momentum correlations and a partialcompensation between diffusion damping and particle interactions.

Analytic calculation of the non-linear cosmic density-fluctuation power spectrum in the Born approximation