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

We study the instability of de Sitter space-time (dS) under thermal radiationin different vacua. We argue that the mode function solution of a scalar fieldin four-dimensional dS can be separated into the incoming and outgoing modes.Different vacua for dS are realized by different combinations of positivefrequency modes assigned to each solution. For a minimally coupled masslessscalar field, we explicitly compute the behavior of the mode function and thecorresponding energy-momentum tensor in the Unruh vacuum near the horizon, andfind that the horizon area increases (decreases) in time when the incoming(outgoing) mode contributes to thermal flux.

Instability of de Sitter space under thermal radiation in different vacua