Description
Chair: Hector Puerta Ramisa
Asymptotic Safety was proposed by Weinberg as a novel way to deal with quantum gravity. Einstein theory of gravity is in principle not renormalizable, however, one need not run the couplings to Planck scale if there is a non-trivial fixed point for the couplings. All the beta functions of the theory should vanish at this fixed point rendering signs for a conformal theory. Hence, the beta...
In this work, we present a detailed computation of the standard and constraint effective potentials in 4-dimensional de Sitter spacetime. Second to the pathologies arising in the perturbation theory of "lighter-than-Hubble" scalars, the stochastic approach is commonly used in the literature to describe the dynamics of scalar degrees of freedom. However, some ambiguities appear in the set-up of...
How do we extend the power of recursion relations to curved spacetimes? In this talk, I will present a novel framework for computing Feynman diagrams on arbitrary FLRW spacetimes, breaking them into lower-order diagrams through causality-driven recursion relations. This approach generalizes the celebrated BCFW recursion relations, traditionally confined to Minkowski spacetime, to settings...
