TMF-homology conjecture for boundary conditions of supersymmetric sigma models

From papers

Let XX be the target of a 3-dimensional N=1\mathcal{N}=1 supersymmetric sigma model, and let X+X_+ denote XX with a disjoint basepoint. Sigma-model boundary-condition conjecture. The homotopy type of the space of boundary conditions is described by TMFX+\operatorname{TMF}\otimes X_+. This is the homological counterpart of the TMF-cohomological description for nondynamical background fields; it reflects the additional dynamical and Dirichlet boundary conditions in a genuine sigma model.

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Primary source

Sergei Gukov, Vyacheslav Krushkal, Lennart Meier and Du Pei, “A new approach to (3+1)-dimensional TQFTs via topological modular forms”, arXiv:2509.12402 (2025).

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