Speaker
Sadra Jazayeri
(Imperial College London)
Description
In this talk, I present a novel connection between cosmological correlators and flat-space Feynman diagrams in momentum space. Focusing on Witten diagrams with heavy internal lines and light external legs, I establish a Massive Flat Space (MFS) limit. In this limit, such heavy diagrams simplify to contact graphs with a vertex factor equal to the amputated n-point diagram in flat space. As an application of the MFS limit, I obtain simple expressions for specific inflationary one-loop graphs, in the small sound speed regime.
Primary authors
Sadra Jazayeri
(Imperial College London)
Sebastian Cespedes
(Imperial College London)
