# Null infinity from quasi-local phase space

### APA

Wieland, W. (2021). Null infinity from quasi-local phase space. Perimeter Institute. https://pirsa.org/21030031

### MLA

Wieland, Wolfgang. Null infinity from quasi-local phase space. Perimeter Institute, Mar. 18, 2021, https://pirsa.org/21030031

### BibTex

@misc{ pirsa_PIRSA:21030031, doi = {10.48660/21030031}, url = {https://pirsa.org/21030031}, author = {Wieland, Wolfgang}, keywords = {Quantum Gravity}, language = {en}, title = {Null infinity from quasi-local phase space}, publisher = {Perimeter Institute}, year = {2021}, month = {mar}, note = {PIRSA:21030031 see, \url{https://pirsa.org}} }

Wolfgang Wieland University of Erlangen-Nuremberg

## Abstract

I will consider the phase space at null-infinity from the r\rightarrow\infty limit of a quasi-local phase space for a finite box with a boundary that is null. This box will serve as a natural IR regulator. To remove the IR regulator, I will consider a double null foliation together with an adapted Newman--Penrose null tetrad. The limit to null infinity (on phase space) is obtained in the limit where the boundary is sent to infinity. I will introduce various charges and explain the role of the corresponding balance laws. The talk is based on the paper: arXiv:2012.01889.