Seminario Física Teórica. Ilya L. Shapiro (Universidade Federal de Juiz de Fora, Minas Gerais, Brazil)

Effective quantum gravity: corrections to Newton's potential
and the running of fundamental constants in deep IR
Ilya L. Shapiro
(Universidade Federal de Juiz de Fora, MG, Brazil)

Abstract:
In the formulation of the effective approach to quantum gravity (QG),
the main application is, traditionally, the QG corrections to Newton's
potential. We explain why Einstein's gravity may be a universal theory
of the low-energy (IR) QG. On top of that, the consistent derivation
of the gauge- and parametrization-independent QG contributions to
Newton's potential are described. On the other hand, since Einstein's
gravity has only massless degrees of freedom, it remains relevant in
the deep IR and, in principle, may provide the running of Newton and
cosmological constants up to the nowadays cosmic scale. We show
that this effect may take place only in the QG theory with a nonzero
cosmological constant and, also, requires using the Vilkovisky-DeWitt
effective action, which means, extending the basic definitions of
quantum field theory.

Fecha: Martes 7 de marzo de 2023

Hora:   12:10

Lugar: Seminario de Física Teórica