## Video URL

https://pirsa.org/24100131# Condensation in topological orders and topological holography

### APA

Wen, R. (2024). Condensation in topological orders and topological holography. Perimeter Institute for Theoretical Physics. https://pirsa.org/24100131

### MLA

Wen, Rui. Condensation in topological orders and topological holography. Perimeter Institute for Theoretical Physics, Oct. 22, 2024, https://pirsa.org/24100131

### BibTex

@misc{ scivideos_PIRSA:24100131, doi = {}, url = {https://pirsa.org/24100131}, author = {Wen, Rui}, keywords = {Quantum Matter}, language = {en}, title = {Condensation in topological orders and topological holography}, publisher = {Perimeter Institute for Theoretical Physics}, year = {2024}, month = {oct}, note = {PIRSA:24100131 see, \url{https://scivideos.org/pirsa/24100131}} }

Rui Wen University of British Columbia

**Talk number**PIRSA:24100131

**Source Repository**PIRSA

**Collection**

**Talk Type**Other

**Subject**

## Abstract

Condensation of topological defects is the foundation of the modern theory of bulk-boundary correspondence, also known as topological holography. In this talk, I discuss string condensation in 3+1D topological orders, which plays a role analogous to anyon condensation in 2+1D topological orders. I will demonstrate through examples how they correspond to 2+1D symmetry enrichd phases, including both gapped and gapless phases. Then I give a detailed analysis of string condensaiton in 3+1D discrete gauge theories. I compute the outcome of the condensation, namely the category of excitations surviving the condensation. The results suggest that a complete topological holography for 2+1D phases can only be established by taking into account all possible ways of condensing strings in the bulk 3+1D topological order.