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 investigate the Euclidean vacuum mode functions of a massive vector fieldin a spatially open chart of de Sitter spacetime. In the one-bubble openinflationary scenario that naturally predicts a negative spatial curvatureafter a quantum tunneling, it is known that a light scalar field has theso-called supercurvature mode, i.e. an additional discrete mode which describesfluctuations over scales larger than the spatial curvature scale. If suchsupercurvature modes exist for a vector field with a sufficiently light mass,then they would decay slower and easily survive the inflationary era. However,the existence of supercurvature mode strongly depends on details of the system.To clarify whether a massive vector field has supercurvature modes, we considera U(1) gauge field with gauge and conformal invariances spontaneously brokenthrough the Higgs mechanism, and present explicit expressions for the Euclideanvacuum mode functions. We find that, for any values of the vector field mass,there is no supercurvature mode. In the massless limit, the absence ofsupercurvature modes in the scalar sector stems from the gauge symmetry.

Is there supercurvature mode of massive vector field in open inflation?