Functorial S1S^{1}-equivariant trace for rigid symmetric monoidal S\mathbb{S}-categories

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Let TT be a rigid symmetric monoidal S\mathbb{S}-category. For an object x∈Tx\in T with an autoequivalence uu, the trace construction gives a morphism from the loop simplicial set LTLT to T(1,1)T(1,1), where LTLT is the S1S^{1}-equivariant simplicial set formed from invertible morphisms in T(S1)T(S^{1}) and T(1,1)T(1,1) has the trivial S1S^{1}-action. Let S-Cat⁡rig\mathbb{S}\text{-}\operatorname{Cat}^{rig} be the category of rigid symmetric monoidal S\mathbb{S}-categories, and let

L,E:S-Cat⁡rig⟶S1-SSetL,E:\mathbb{S}\text{-}\operatorname{Cat}^{rig}\longrightarrow S^{1}\text{-}SSet

be the functors sending TT to LTLT and to T(1,1)T(1,1), respectively.

Functorial trace conjecture. There exists a morphism

Tr:L⟶ETr:L\longrightarrow E

in Ho(Fun⁡(S-Cat⁡rig,S1-SSet))Ho(\operatorname{Fun}(\mathbb{S}\text{-}\operatorname{Cat}^{rig},S^{1}\text{-}SSet)) such that, for every rigid symmetric monoidal S\mathbb{S}-category TT, the induced morphism

Tr:LT⟶T(1,1)Tr:LT\longrightarrow T(1,1)

is the trace map described above.

This conjecture gives a functorial S1S^{1}-equivariant refinement of the trace map, which is the categorical input for the natural lift in the derived-geometric construction. The source says that its application to rigid symmetric monoidal (1,∞)(1,\infty)-categories solves the preceding conjecture, so this conjecture is resolved.

References

Primary source

B. Toën and G. Vezzosi, “A note on Chern character, loop spaces and derived algebraic geometry”, arXiv:0804.1274 (2008).

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