FAU^2 Workshop on quantum gravity across scales: from physics at the Planck scale to effective theories

Session

Session 3

21 May 2025, 14:00

ECAP Laboratory Building

52. Dynamical models of regular black holes and singularity resolution from effective quantum spacetimes

Alfio Bonanno (INAF - INFN Catania)

21/05/2025, 14:00

invited talk

The study of regular black holes has recently garnered significant attention, driven by the need to extend general relativity to accurately describe black hole interiors and by advances in observational technologies. Despite substantial progress in this field, significant challenges remain in identifying and characterizing physically well-motivated classes of regular black holes. In this talk,...

66. From Cosmology to Black Holes: Effective Dynamics via LTB and Scalar-Tensor Reconstruction

Hongguang Liu

21/05/2025, 14:40

invited talk

Regular black holes play a pivotal role in understanding effective dynamics arising from quantum gravity. In this talk, I will present a framework that maps cosmological effective dynamics onto spherically symmetric systems via Lemaitre-Tolman-Bondi (LTB) embeddings. This method allows for the reconstruction of the 1+1d effective dynamics and a 4D covariant scalar-tensor Lagrangian, derived...

40. New results for the shock wave model

Francesco Fazzini (University of New Brunswick)

21/05/2025, 15:20

contributed talk

Effective stellar collapse inspired by loop quantum cosmology predicts a a bounce of the stellar core when the energy density becomes planckian, and a post-bounce shell-crossing singularity/shock wave formation. I will show recent developments of the model, highlighting some of its strengths and limitations.

45. Causal structure of nonhomogeneous dust collapse in effective loop quantum gravity

Michał Bobula (University of Wrocław)

21/05/2025, 15:50

contributed talk

I will discuss aspects of the Husain-Kelly-Santacruz-Wilson-Ewing dust collapse model in effective loop quantum gravity. I will focus on rigorous causal structure analysis, in particular, I will present numerically computed Penrose-Carter diagrams for both homogeneous Oppenheimer-Snyder collapse scenario and nonhomogeneous one with a Gaussian initial dust profile. I will argue that a...