Seminario de Física Teórica: “New results on the conformal anomaly and anomaly-induced effective action of gravity".- Jueves 12 de noviembre
El jueves 12 de noviembre de 2026 a las 12:10 h en el Seminario de Física Teórica (planta primera del Edificio A, Físicas) se celebrará un nuevo seminario del Departamento de Física Teórica. Ilya L. Shapiro (Federal University of Juiz de Fora (UFJF), Minas Gerais, Brazil, en licencia sabática en la Universidad de Zaragoza) impartirá la conferencia de título "New results on the conformal anomaly and anomaly-induced effective action of gravity".
Resumen (en inglés):
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.
