# Questions tagged [condensed-matter]

Condensed matter physics deals with properties of condensed phases of matter, seeking to understand these phases by using the fundamental laws, e.g. quantum statistical mechanics, etc. The familiar condensed phases are solids and liquids while more exotic condensed phases include the superconducting phase, the ferromagnetic and antiferromagnetic phases of spins on atomic lattices, and the Bose–Einstein condensate in cold atomic systems.

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### What is the etale homotopy type of the Witt group of braided fusion categories?

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### Are framed manifolds cubulatable?

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### Generalization of Drinfeld double to comodule algebras

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### Relationship between irreducible representations of the Schur covering group and elements of $H^2(G,U(1))$

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### Why are Levin-Wen/Turaev-Viro models said to be non-chiral?

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### Is there a simple argument that shows that two unitary fusion categories are Morita equivalent if their Drinfeld centers are equal?

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### Are 2d gauge anomalies determined by genus-one data?

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### A property of slant product in group cohomology

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### Relation between the homotopy classes of maps on a torus, and maps on a sphere

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### What is a Fermi surface?

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### Regularizing divergent sums over lattices

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