The noncommutative cohomology conjecture for dg-categories

Let TR\mathbb{TR} be a candidate (co)homology theory on dg-categories over Fp\mathbf{F}_{p}, with dgCatFp\mathsf{dg}\mathsf{Cat}_{\mathbf{F}_{p}} the category of dg-categories over Fp\mathbf{F}_{p} and Sp\mathsf{Sp} the category of spectra. For a Morita equivalence CD\mathsf{C}\to\mathsf{D}, require that TR(C)TR(D)\mathbb{TR}(\mathsf{C})\to\mathbb{TR}(\mathsf{D}) be a stable equivalence, and let K()K(-) denote algebraic KK-theory. If XX is a sufficiently nice Fp\mathbf{F}_{p}-scheme and lpl\neq p is prime, write Perf(X)\mathsf{Perf}(X) for its dg-category of perfect complexes, FF for a Frobenius transformation, and ()hF(-)^{hF} for homotopy fixed points. The noncommutative cohomology conjecture. There exists a (co)homology theory TR\mathbb{TR} satisfying Morita invariance, being a localizing invariant, admitting a natural transformation K()TR()K(-)\to\mathbb{TR}(-), giving πTR(C)\pi_{\ast}\mathbb{TR}(\mathsf{C}) a natural cochain-complex structure, and such that for every such XX and lpl\neq p its completed hypercohomology recovers ll-adic cohomology, it admits Frobenius and recovers the Lefschetz–Grothendieck ll-adic trace formula, and the induced trace map K(Perf(X))TR(Perf(X))hFK(\mathsf{Perf}(X))\to\mathbb{TR}(\mathsf{Perf}(X))^{hF} satisfies

πiK(Perf(X))Zlπi(TR(Perf(X))hF)Zl\pi_iK(\mathsf{Perf}(X))\otimes\mathbf{Z}_l\cong\pi_i(\mathbb{TR}(\mathsf{Perf}(X))^{hF})\otimes\mathbf{Z}_l

for i0i\geq 0. The conjecture proposes a noncommutative analogue of ll-adic cohomology and the Quillen–Lichtenbaum approximation, with the trace map providing the connective approximation after ll-completion.

Sources & referencesView supporting material

Primary source

Ilias Amrani, “Analogy between the cyclotomic trace map K TC and the Grothendieck trace formula via noncommutative geometry”, arXiv:1503.00317 (2015).

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