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Low Energy? Think Positive!

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If you have a question about this talk, please contact Francesco Coradeschi .

At low energies, the world around us can be described very accurately using the Standard Model and General Relativity. However, these are at best only ``effective’’ descriptions: valid at low energies but destined to break down as experiments in particle physics and cosmology probe increasingly higher energies, ultimately requiring a new (UV complete) theory to take over. In this talk, I will review the constraints which must be placed on such low-energy Effective Field Theories if they are to have any hope of a smooth Wilsonian UV completion at high energies (which is unitary, causal and local). These constraints are known as ``positivity bounds’’. To provide two illustrative examples, I’ll show how these bounds can be used to constrain Beyond the Standard Model physics (such as the dimension-8 operators in SMEFT ), and also constrain theories of modified gravity (such as massive gravity).

Slides of the talk can be found here

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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