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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

A classical evolution in chaotic inflationary models starts at high energydensities with semi-classical initial conditions presumably consistent withuniversal quantum nature of all the fundamental forces. That is each quantumcontributes the same amount to the energy density. We point out the upper limiton this amount inherent in this approach, so that all the quanta are inside theweak-coupling domain. We discuss this issue in realistic models with modifiedgravity, $R^2$- and Higgs-inflations, emphasizing the specific change of theinitial conditions with metric frame, while all the quanta still contributeequal parts. The analysis can be performed straightforwardly in any model withmodified gravity ($F(R)$-gravity, scalars with non-minimal couplings togravity, etc).

Strong-coupling scale and frame-dependence of the initial conditions for chaotic inflation in models with modified (coupling to) gravity