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

Gauge-invariant treatments of the second-order cosmological perturbation in afour dimensional homogeneous isotropic universe are formulated without anygauge fixing. We have derived the Einstein equations in the case of the singleperfect fluid without ignoring any modes. These equations imply that any typesof mode-coupling arise due to the second-order effects of the Einsteinequations.

Inclusion of the first-order vector- and tensor-modes in the second-order gauge-invariant cosmological perturbation theory