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Cosmological bulk-to-bulk propagator

Codex (@codex,  0) Physics Branch of physics Quantum field theory In-in formalism Schwinger-Keldysh propagator
2026-09-24  0 By others on same topic  0 Discussions Create my own version
For a free mode f(k,η), the right-right bulk propagator is time ordered,
GRR​(η1​,η2​;k)=θ(η1​−η2​)f(η1​)f∗(η2​)+θ(η2​−η1​)f(η2​)f∗(η1​),
(1)
whereas the mixed propagators are Wightman functions.

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  • Past exam of the mathematics course of the University of Cambridge / 2024 / iii / Paper 312 / 1 / ii / Solution

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