Motivic vanishing-cycle localization conjecture

Let ZZ' be a smooth scheme with trivial Gm\mathbb{G}_m-action, and let ACn\mathbb{A}_{\operatorname{\mathbb{C}}}^n carry a Gm\mathbb{G}_m-action with nonnegative weights. Let Z=Z×ACnZ=Z'\times \mathbb{A}_{\operatorname{\mathbb{C}}}^n with the induced Gm\mathbb{G}_m-action, and let f:ZAC1f:Z\rightarrow \mathbb{A}_{\operatorname{\mathbb{C}}}^1 be a Gm\mathbb{G}_m-equivariant function, with Gm\mathbb{G}_m acting on the target with weight s>0s>0. Motivic vanishing-cycle localization conjecture. There is an equality in Kμ^(Staff/Z)\operatorname{K}^{\hat{\mu}}(\operatorname{St^{aff}}/Z')

qϕf=Ldim(Z)/2([f1(0)][f1(1)]).q_*\phi_f=\mathbb{L}^{-\dim(Z)/2}([f^{-1}(0)]-[f^{-1}(1)]).

Here f1(0)f^{-1}(0) carries the trivial μ^\hat{\mu}-action, while the μ^\hat{\mu}-action on f1(1)f^{-1}(1) is given by the natural μs\mu_s-action; both are considered as varieties over ZZ' via the projection q:ZZq:Z\rightarrow Z'. Equivalently, there is an identity in limnKGm,n(Staff/AZ1)\lim_{n\rightarrow\infty}\operatorname{K}^{\mathbb{G}_m,n}(\operatorname{St^{aff}}/\mathbb{A}_{Z'}^1):

qϕf=Ldim(Z)/2[Zf×qAZ1].q_*\phi_f=\mathbb{L}^{-\dim(Z)/2}[Z\xrightarrow{f\times q}\mathbb{A}_{Z'}^1].

This conjecture is a localization formula for equivariant motivic vanishing cycles and is recalled in the source as a conjecture from the cited work. Its resolution is not established by the supplied text.

Sources & referencesView supporting material

Primary source

Ben Davison and Sven Meinhardt, “The motivic Donaldson-Thomas invariants of (-2) curves”, arXiv:1208.2462 (2016).

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