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 study quantum tunneling for the de Sitter radiation in the planarcoordinates and global coordinates, which are nonstationary coordinates anddescribe the expanding geometry. Using the phase-integral approximation for theHamilton-Jacobi action in the complex plane of time, we obtain theparticle-production rate in both coordinates and derive the additionalsinusoidal factor depending on the dimensionality of spacetime and the quantumnumber for spherical harmonics in the global coordinates. This approachresolves the factor of two problem in the tunneling method.

The Stokes Phenomenon and Quantum Tunneling for de Sitter Radiation in Nonstationary Coordinates