Spin structures on connection moduli spaces over a manifold X are equivalent to orientations over X times a circle, yielding canonical spin structures for positive Dirac operators on spin 6-manifolds.
A categorified excision principle for elliptic symbol families
1 Pith paper cite this work. Polarity classification is still indexing.
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abstract
We develop a categorical index calculus for elliptic symbol families. The categorified index problems we consider are a secondary version of the traditional problem of expressing the index class in K-theory in terms of differential-topological data. They include orientation problems for moduli spaces as well as similar problems for skew-adjoint and self-adjoint operators. The main result of this paper is an excision principle which allows the comparison of categorified index problems on different manifolds. Excision is a powerful technique for actually solving the orientation problem; applications appear in the companion papers arXiv:1811.01096, arXiv:1811.02405, and arXiv:1811.09658.
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2019 1verdicts
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On spin structures and orientations for gauge-theoretic moduli spaces
Spin structures on connection moduli spaces over a manifold X are equivalent to orientations over X times a circle, yielding canonical spin structures for positive Dirac operators on spin 6-manifolds.