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

We study massive real scalar $\phi^4$ theory in the expanding Poincare patchof de Sitter space. We calculate the leading two-loop infrared contribution tothe two-point function in this theory. We do that for the massive fields bothfrom the principal and complementary series. As can be expected at this orderlight fields from the complementary series show stronger infrared effects thanthe heavy fields from the principal one. For the principal series, unlike thecomplementary one, we can derive the kinetic equation from the system ofDyson--Schwinger equation, which allows us to sum up the leading infraredcontributions from all loops. We find two peculiar solutions of the kineticequation. One of them describes the stationary Gibbons--Hawking-typedistribution for the density per comoving volume. Another solution showsexplosive (square root of the pole in finite proper time) growth of theparticle number density per comoving volume. That signals the possibility ofthe destruction of the expanding Poincare patch even by the very massivefields. We conclude with the consideration of the infrared divergences inglobal de Sitter space and in its contracting Poincare patch.

Infrared dynamics of the massive $\phi^4$ theory on de Sitter space