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

Let XX be a space, let M=TXM=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(TX)\operatorname{Perf}(X,\cE)\simeq \Lag_X(T^*X)

which sends the constant sheaf on a point xXx\in X to the conormal Lagrangian TxXTXT_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.

Sources & referencesView supporting material

Primary source

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

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