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Cosmological Correlators From Flat Space Feynman Integrals

Sadra Jazayeri · CERN

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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.**.

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The talk

  1. Cosmological Correlators From Flat Space Feynman Integrals 2024-10-28 · 25 min · CERN's player

Credits and licence

Institution
CERN
Department
TH institutes
Speaker
Sadra Jazayeri
Year
2024
Language
English
Subjects
Astronomy and space
Source
CERN
Licence
CERN, as CERN states it. CERN's terms
Attribution
© CERN. CERN provides its audiovisual media free of charge for educational and informational use, credited to CERN; this lecture is shown in CERN's own player.
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