Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series P^3
Subjects hep-ph,hep-th
Date Tuesday 4 February 2020
Time 11:00
Institute LPTHE
Seminar Room Library, tour 13-14, 4th floor
Speaker's Last Name Riva
Speaker's First Name Francesco
Speaker's Email Address
Speaker's Institution Geneva University
Title Microscopic Bounds on Macroscopic Theories
Abstract Effective Field Theories (EFTs) appear everywhere there is a mass scale. They serve to simplify complex multiscale problems (e.g. the theory of fermions below the electroweak scale), and they serve as general tools to parametrise the unknown or incalculable (e.g. the pion chiral Lagrangian, gravity, or physics beyond the standard model). In this sense, they are perhaps even too general (everything which is not forbidden is compulsory). In this talk I will present a tool to distinguish EFTs that can originate from microscopic unitary theories and I will show that this strongly limits the (classic and quantum) running of EFTs scattering amplitudes. In particular, Massive gravity, theories with isolated massive higher-spin particles, and theories with very irrelevant interactions, cannot originate from unitary theories.
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