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Bounding cosmological EFTs

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If you have a question about this talk, please contact Gonzalo Villa .

It is known Wilson coefficients of an Effective Field Theory cannot take any value and still lead to physical descriptions without violations of causality and unitarity. In this talk, I will show the consequences of causality an unitarity on cosmological backgrounds focusing on two-point functions. On the first part, I will consider the consequences of causality on the EFT of inflation, particularly in a model that was proposed to give a large abundance of primordial black holes. Afterwards, I’ll show how a positive spectral density in the Kahlen Lehman decomposition can impose bounds on the Wilson coefficients of the 2-point contributions of a spin 0 and spin 1 EFT in de Sitter.

This talk is part of the Cosmology Lunch series.

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Cambridge University Engineering Department, CBL Rm #438 (http://learning.eng.cam.ac.uk/Public/Directions) LR10, Engineering, Department of Room 13

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