Conjecture on limiting third twisted Chern character for tilt-stable objects

Let XX be a smooth projective 3-fold, fix BNS(X)QB\in\operatorname{NS}(X)_{\mathbb{Q}} and an ample class ω\omega, and let EDbCoh(X)E\in D^b\operatorname{Coh}(X). Let β(E)\overline{\beta}(E) be the specified root of

v0B(E)β22v1B(E)β+2v2B(E)=0,v_0^B(E)\overline{\beta}^{\,2}-2v_1^B(E)\overline{\beta}+2v_2^B(E)=0,

namely

β(E)=2v2B(E)v1B(E)+Δω,B(E).\overline{\beta}(E)=\frac{2v_2^B(E)}{v_1^B(E)+\sqrt{\overline{\Delta}_{\omega,B}(E)}}.

Limiting BG conjecture. Suppose there is an open neighborhood UR2U\subset\mathbb{R}^2 containing (0,β(E))(0,\overline{\beta}(E)) such that, for every (α,β)U(\alpha,\beta)\in U with α>0\alpha>0, the object EBαω,B+βωE\in\mathcal{B}_{\alpha\omega,B+\beta\omega} is ναω,B+βω\nu_{\alpha\omega,B+\beta\omega}-stable. Then

ch3B+β(E)ω(E)0.\operatorname{ch}_3^{B+\overline{\beta}(E)\omega}(E)\leq 0.

This is an equivalent-form conjecture designed to reduce the BG inequality to tilt-stable objects near a limiting wall. The source states it as a generalization of an earlier conjecture, and no resolution is supplied.

Sources & referencesView supporting material

Primary source

Dulip Piyaratne and Yukinobu Toda, “Moduli of Bridgeland semistable objects on 3-folds and Donaldson-Thomas invariants”, arXiv:1504.01177 (2016).

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