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Positivity bounds on effective field theories

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If you have a question about this talk, please contact Dr Dong-Gang Wang.

Unitarity and analyticity are some of the most fundamental properties of S-matrix/quantum field theory. I will explain why these simple properties can impose strong constraints on the Wilson coefficients/coupling constants of a Lorentz invariant effective field theory. The central tool to use is the dispersion relations, and stronger bounds can be extracted if the crossing symmetry and unitarity conditions are fully utilized. I will discuss a couple of applications of these bounds in cosmology and particle physics.

This talk is part of the Cosmology Lunch series.

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