2024
DOI: 10.1007/jhep01(2024)138
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Influence phase of a dS observer. Part I. Scalar exchange

R. Loganayagam,
Omkar Shetye

Abstract: Inspired by real-time computations in AdS black holes, we propose a method to obtain the influence phase of a cosmological observer by calculating the on-shell action on a doubled spacetime geometry. The influence phase is the effective action for an open system: for a dS static patch observer coupled to a scalar field it incorporates the radiation reaction due to the bulk fields and their dS Hawking radiation. For a general extended source in dS, we describe how to account for finite size effects. In the long… Show more

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