Home

[Fisica CT] [Events] Annuncio di seminari

Mar, 10/12/2024 - 11:58 — Anonimo

Durante questa settimana saranno tenuti i due seguenti seminari:

 

----------------------------------------------------------------------------------------------------------------------------------

 

 

Mercoledì 11 dicembre p.v., con inizio alle ore 15:30, presso l' Aula T del #DFA

Speaker : Dr Renata Ferrero,    Inst. for Quantum Gravity, FAU Erlangen – Nurnberg, Erlangen, Germany

Titolo:     Relational Lorentzian Asymptotic Safe Gravity

 

The asymptotically safe (ASQG) and the canonical (CQG) approach to quantum gravity share to be both non-perturbative programmes. However, apart from that, they have been developed to a large extent independently of each other. Our aim is to overcome actual differences: The idea is to start from the path integral formulation of Lorentzian CQG in its
reduced phase space formulation which yields the generating functional of physical, i.e. gauge invariant, n-point functions for relational observables. The corresponding effective
average actions of these generating functionals can then be subjected to the Wetterich flow equation. Particular care is needed due to the necessary switch to Lorentzian signature
which has strong impact on the convergence of proper time integrals which requires different cutoff functions than in the Euclidean version.

 

----------------------------------------------------------------------------------------------------------------------------------

 

Giovedì 12 dicembre p.v., con inizio alle ore 15:30, presso l' Aula T del #DFA

Speaker : Dr Breno L. Giacchini,   Charles University,  Prague, Czech Republic

Titolo:     Towards regular black holes in sixth-derivative gravity

 

Higher-derivative terms are relevant in several approaches to quantum gravity; they occur in the perturbative quantization of Einstein gravity and can be used to construct

 

(super-)renormalizable quantum gravity models. In this talk, we present spherically symmetric static solutions of the most general sixth-derivative gravity using series expansions.

 

It turns out that the only solutions of the complete theory, i.e., with generic coupling constants, that possess a Frobenius expansion around the origin (r=0) are necessarily regular.

 

These results reveal a significant difference between higher-derivative gravity models with 4 and 6 derivatives in what concerns the space of classical solutions and their

 

potential to resolve black hole singularities.

 

----------------------------------------------------------------------------------------------------------------------------------