# Two applications of homotopy theory to physics

### APA

Freed, D. (2019). Two applications of homotopy theory to physics. Perimeter Institute. https://pirsa.org/19090112

### MLA

Freed, Dan. Two applications of homotopy theory to physics. Perimeter Institute, Sep. 18, 2019, https://pirsa.org/19090112

### BibTex

@misc{ pirsa_PIRSA:19090112, doi = {10.48660/19090112}, url = {https://pirsa.org/19090112}, author = {Freed, Dan}, keywords = {Other}, language = {en}, title = {Two applications of homotopy theory to physics}, publisher = {Perimeter Institute}, year = {2019}, month = {sep}, note = {PIRSA:19090112 see, \url{https://pirsa.org}} }

Harvard University

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Abstract

Topology illuminates properties of geometric spaces which are independent of scale. Scale-independent features of physical systems play an important role, for example when deducing the large-scale behavior from a small-scale description. After an introduction to basic topological ideas, I will discuss two joint results with Mike Hopkins, one an application to string theory and the other an application to condensed matter theory.