Bounding cosmological EFTs

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• Mariana Carrillo (Imperial College)
• Monday 02 February 2026, 13:00-14:00
• CMS, Pav. B, CTC Common Room (B1.19) [Potter Room].

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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