Seminario CAPA. lya L. Shapiro (Universidade Federal de Juiz de Fora, MG, Brazil on sabbatical leave at DFTUZ/UNIZAR)

SEMINARIO CAPA

"New results on the conformal anomaly and anomaly-induced 
           effective action of gravity"

Ilya L. Shapiro
(Federal University of Juiz de Fora -UFJF-, Minas Gerais, Brazil
On sabbatical leave at the Universidad de Zaragoza)

Abstract:
Conformal symmetry and, correspondingly, the trace anomaly belong to  the most relevant manifestations of quantum field theory in curved spacetime. We report on new results concerning representations of anomaly-induced effective action of gravity, low-energy limit, and the new renormalizable model in 4D, where the guiding symmetry is local conformal symmetry. The new application is the possibility to have a cosmological bounce (transition from contraction to expansion of the Universe) avoiding cosmological singularity. The use of anomaly-induced action enable one to achieve this without any  ad hoc changes of gravitational equations or introducing scalar fields. However, the numerical estimate shows that the consistent physical implementation of this approach requires going beyond the perturbative regime.

Fecha: jueves, 12 de noviembre de 2026
Hora:   12:10 horas
Lugar: Seminario de Física Teórica