Nadler–Tanaka's constructible-sheaf model for cotangent bundles

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Let XX be a space, let M=T∗XM=T^*X, let Λ=X\Lambda=X be the zero section, and set

\cE=End⁡\Lagpt(pt)(pt).\cE=\operatorname{End}_{\Lag_{pt}(pt)}(pt).

Let Perf⁡(X,\cE)\operatorname{Perf}(X,\cE) denote the stable ∞\infty-category of perfect constructible sheaves of \cE\cE-modules on XX.

Nadler–Tanaka's constructible-sheaf conjecture. There is a canonical equivalence of stable ∞\infty-categories

Perf⁡(X,\cE)≃\LagX(T∗X)\operatorname{Perf}(X,\cE)\simeq \Lag_X(T^*X)

which sends the constant sheaf on a point x∈Xx\in X to the conormal Lagrangian Tx∗X⊂T∗XT_x^*X\subset T^*X.

This reformulates the cotangent-bundle conjecture in sheaf-theoretic terms and connects Lagrangian cobordisms with constructible and microlocal sheaf theory. The source states it as equivalent to the preceding cotangent-bundle conjecture and supplies no proof.

References

Primary source

David Nadler and Hiro Lee Tanaka, “A stable infinity-category of Lagrangian cobordisms”, arXiv:1109.4835 (2020).

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