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Topological quantum field theory.

17 votes

Cohomology rings and 2D TQFTs

There is indeed a Morse homology explanation; and, in the symplectic case, it's a degeneration of the Hamiltonian Floer cohomology picture. In a nutshell, you degenerate the surfaces to graphs, and th …
Tim Perutz's user avatar
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18 votes
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Seiberg-Witten theory on 4-manifolds with boundary

Hi Fabian! Kronheimer and Mrowka's book Monopoles and three-manifolds lays out comprehensively the construction of a Seiberg-Witten TQFT, called monopole Floer homology. It is conjectured to be isom …
Tim Perutz's user avatar
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