K-theory (physics)
In string theory, the K-theory classification refers to a conjectured application of K-theory (in abstract algebra and algebraic topology) to superstrings, to classify the allowed Ramond-Ramond field strengths as well as the charges of stable D-branes.
In condensed matter physics K-theory has also found important applications, specially in the topological classification of topological insulators, superconductors and stable Fermi Surfaces (Kitaev (2009), Horava (2005)).
Read more about K-theory (physics): History, Applications, K-theory Classification of RR Fluxes, K-theory Classification of D-branes, Reconciling Twisted K-theory and S-duality, Researchers