Cosmological correlators from the Euclidean sphere

@misc{katsevich2026cosmological,
  title = {{Cosmological correlators from the Euclidean sphere}},
  author = {Andrei Katsevich and Zimo Sun},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.28516},
  eprint = {2610.28516},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.28516},
}

TY  - UNPB
TI  - Cosmological correlators from the Euclidean sphere
AU  - Andrei Katsevich
AU  - Zimo Sun
PY  - 2026
DA  - 2026/10/20
PB  - arXiv
DO  - 10.48550/arxiv.2610.28516
UR  - https://arxiv.org/abs/2610.28516
AB  - We propose a new framework for computing late-time cosmological correlators in de Sitter spacetime by analytic continuation from the Euclidean sphere. In this framework, correlators of arbitrary massive scalar fields take the universal form of generalized Euler integrals. Using this representation, we reproduce the results obtained using the Schwinger-Keldysh formalism for a range of tree-level and loop diagrams, providing nontrivial checks of the equivalence between the Euclidean and the in-in formalisms. We further show that a Landau analysis of the generalized Euler integrals determines the singularities of the corresponding correlators in momentum space. This framework provides a systematic approach to studying the analytic structure of cosmological correlators.
ER  -