Orateur
Description
During the last decade, superrenormalizable or UV-finite theories of pure gravity and gauge theories were proposed in the framework of weakly nonlocal quantum field theories, regardless of the number of spatial dimensions. They are inspired by the success of string theory to improve the UV-behavior of local quantum field theories. Furthermore, the nonlocal scale acts as a smooth Lorentz-invariant cutoff for the radiative corrections to the masses of elementary scalars, opening a new path to the technical naturalness problem of the Higgs boson mass, with possible experimental signals of nonlocality at the LHC. In this talk, I will revisit some historical models with extra dimensions and branes, which are of interest to solve the gauge hierarchy problem and the flavor puzzle. I will argue that the extra ingredient of weak nonlocality allows new model building issues to generate hierarchies in particle physics (gauge hierarchy problem, flavor hierarchy, etc).
