Weak and strong localization conjectures for hypertoric varieties

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Let KK be a subtorus of a torus TT, let χ=(χi)\boldsymbol{\chi}=(\chi_i) be the associated characters, and let α\alpha be as in the construction of the hypertoric variety. For each circuit II, let WIW_I be the corresponding wall in X∗(K)X^*(K), let n⃗I\vec{n}_I be a primitive normal vector to WIW_I in X∗(K)⊂X∗(T)X_*(K)\subset X_*(T), chosen to pair positively with α\alpha, and set

NI=∑i∣⟨n⃗I,χi⟩T∣,N=max⁡I{NI},N_I=\sum_i\left|\langle\vec{n}_I,\chi_i\rangle_T\right|,\qquad N=\max_I\{N_I\},

with

P={χ∈X∗(K):∣⟨n⃗I,χ⟩K∣≤NI}.P=\left\{\chi\in X^*(K):\left|\langle\vec{n}_I,\chi\rangle_K\right|\leq N_I\right\}.

Here λ=dΛ\lambda=d\Lambda is an integral choice of parameter, and LocλLoc_{\lambda} denotes the localization functor. Weak and strong localization conjectures. If p>Np>N, then: (i) in the weak form, if Λ∉P\Lambda\notin P, the functor LocλLoc_{\lambda} has finite homological dimension; and (ii) in the strong form, when KK and α\alpha satisfy some positivity condition and the vectors n⃗I\vec{n}_I are chosen to be positive, it is enough to choose λ\lambda outside the negative part of PP with respect to the orientations given by the n⃗I\vec{n}_I. These conjectures are proposed as the two forms of a localization theorem for hypertoric varieties in positive characteristic, parallel to the localization theorem of Bezrukavnikov–Mirković–Rumynin. The source does not state whether either form is proved or remains open.

References

Primary source

Theodore J. Stadnik, “Étale Splittings of Certain Azumaya Algebras on Toric and Hypertoric Varieties in Positive Characteristic”, arXiv:1102.4139 (2011).

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