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Uplifting Massive Graphs from Minkowski to de Sitter

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If you have a question about this talk, please contact Thomas Colas .

Identifying useful flat-space limits for cosmological correlators—where they can be expressed in terms of observables in Minkowski space—is nontrivial due to their scale-invariant nature. In this talk, I present a massive flat-space limit in which cosmological correlators, induced by the exchange of heavy fields, can be expressed in terms of massive Feynman graphs in flat space. As a phenomenological application, I apply this flat space limit to compute specific one-loop contributions from heavy fields to primordial non-Gaussianity.

This talk is part of the Cosmology Lunch series.

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