## Video URL

http://pirsa.org/21090009# Black Hole interior: Symmetries and regularization

### APA

Sartini, F. (2021). Black Hole interior: Symmetries and regularization . Perimeter Institute for Theoretical Physics. http://pirsa.org/21090009

### MLA

Sartini, Francesco. Black Hole interior: Symmetries and regularization . Perimeter Institute for Theoretical Physics, Sep. 09, 2021, http://pirsa.org/21090009

### BibTex

@misc{ scitalks_21090009, doi = {}, url = {http://pirsa.org/21090009}, author = {Sartini, Francesco}, keywords = {Strong Gravity}, language = {en}, title = {Black Hole interior: Symmetries and regularization }, publisher = {Perimeter Institute for Theoretical Physics}, year = {2021}, month = {sep}, note = {Talk #21090009 see, \url{https://scitalks.ca}} }

Francesco Sartini École Normale Supérieure de Lyon (ENS Lyon)

## Abstract

The spacetime in the interior of a black hole can be described by an homogeneous line element, for which the Einstein–Hilbert action reduces to a one-dimensional mechanical model. We have shown that this model exhibits a symmetry under the (2+1)-dimensional Poincaré group. The existence of this symmetry provides a powerful criterion to discriminate between different regularization and quantization schemes. It also unravels new aspects of symmetry for black holes, and opens the way towards a rigorous group quantization of the interior. Remarkably, the physical ISO(2,1) symmetry can be seen as a broken infinite-dimensional symmetry. This is done by reinterpreting the action for the model as a geometric action for the BMS3 group, where the configuration space variables are elements of the algebra bms3 and the equations of motion transform as coadjoint vectors.

Zoom Link: https://pitp.zoom.us/j/99646733321?pwd=U05kYU85V0Q4VCtrZ1BNV2JZbE1DUT09