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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Non-linear cosmic structures contain valuable information on the expansionhistory of the background space-time, the nature of dark matter, and thegravitational interaction. The recently developed kinetic field theory ofcosmic structure formation (KFT) allows to accurately calculate the non-linearpower spectrum of cosmic density fluctuations up to wave numbers of$k\lesssim10\,h\,\mathrm{Mpc}^{-1}$ at redshift zero. Cosmology and gravityenter this calculation via two functions, viz. the background expansionfunction and possibly a time-dependent modification of the gravitationalcoupling strength.  The success of the cosmological standard model based on general relativitysuggests that cosmological models in generalized theories of gravity shouldhave observable effects differing only weakly from those in standard cosmology.Based on this assumption, we derive the functional, first-order Taylorexpansion of the non-linear power spectrum of cosmic density fluctuationsobtained from the mean-field approximation in KFT in terms of the expansionfunction and the gravitational coupling strength. This allows us to studynon-linear power spectra expected in large classes of generalized gravitytheories. To give one example, we apply our formalism to generalized Procatheories.

Kinetic field theory: generic effects of alternative gravity theories on non-linear cosmic density-fluctuations