Abstract
Abstract
In a QFT on de Sitter background, one can study correlators between fields pushed to the future and past horizons of a comoving observer. This is a neat probe of the physics in the observer’s causal diamond (known as the static patch). We use this observable to give a generalization of the quasinormal spectrum in interacting theories, and to connect it to the spectral density that appears in the Källén-Lehmann expansion of dS correlators. We also introduce a finite-temperature effective field theory consisting of free bulk fields coupled to a boundary. In matching it to the low frequency expansion of correlators, we find positivity constraints on the EFT parameters following from unitarity.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Cited by
3 articles.
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1. Spinors in (Anti-)de Sitter Space;Journal of High Energy Physics;2023-09-21
2. The graviton four-point function in de Sitter space;Journal of High Energy Physics;2023-06-30
3. The Analytic Wavefunction;Journal of High Energy Physics;2023-06-05