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 determine the retarded and advanced Green's functions and Hadamardparametrices in curved spacetimes for linearized massive and massless gaugebosons and linearized Einstein gravity with a cosmological constant in generallinear covariant gauges. These vector and tensor parametrices containadditional singular terms compared with their Feynman/de Donder-gaugecounterpart. We also give explicit recursion relations for the Hadamardcoefficients, and indicate their generalization to $n$ dimensions. Furthermore,we express the divergence and trace of the vector and tensor Green's functionsin terms of derivatives of scalar and vector Green's functions, and show howthese relations appear as Ward identities in the free quantum theory.

Green's functions and Hadamard parametrices for vector and tensor fields in general linear covariant gauges