|DATE||September 30 (Thu), 2021|
|INSTITUTE||University of Cambridge & CERN|
|TITLE||New Positivity Bounds on Effective Field Theories|
Effective field theory (EFT) is a powerful framework and organising principle for characterising phenomena at different energy scales. The effects of heavier ultra-violet (UV) degrees of freedom become encapsulated in the Wilson coefficients of higher-dimensional operators at low energies in the infra-red (IR). Positivity bounds place general constraints on these coefficients using only fundamental properties of the UV theory such as locality, unitarity, and causality. I will review the derivation of these positivity bounds before presenting recent work extending their applicability to the case of EFTs involving massive spinning particles.