[Seminar] "Aspects of ghost-free nonlocal field theories" by Dr. Luca Buoninfante

Quantum Gravity Unit (Neiman Unit) would like to invite you to a seminar by Dr. Luca Buoninfante from Tokyo Institute of Technology

Title: "Aspects of ghost-free nonlocal field theories"

Abstract:
In this talk, we introduce nonlocal (infinite derivative) field theories. First, we show how, and which principles of standard quantum field theory are affected when higher order derivative operators are considered in the Lagrangian. We focus on the issue of unitarity and on how to make higher derivative theories healthy by means of non-polynomial differential operators. Subsequently, we move to the gravity sector and construct a nonlocal theory whose graviton propagator is ghost-free and explore the possibility to regularize singularities. In the last part, we also discuss some possible phenomenological implication.