Gluing Stability Conditions

Gluing Stability Conditions
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粘合稳定性条件

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发表时间:
2009
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通讯作者:
A. Polishchuk
A. Polishchuk
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作者:
John Collins;A. Polishchuk

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稳定性条件定义一个稳定性条件σ由对(Z,P)给出,其中Z:K 0(D)→ C是D的Grothendieck群K 0(D)的同态,P是一个切片.这样的切片由相位为φ的半稳定对象的子范畴P(φ)的集合给出,对于每个φ ∈ R,其中对于φ1 > φ2,Hom(P(φ1),P(φ2))= 0,并且P(φ)[1] = P(φ + 1)。对于一个对象E ∈ P(φ),我们将使用符号φ(E)= φ。类似于向量丛的情况,对于D的每个对象E,应该存在Harder-Narasimhan过滤(HN-过滤),即,从半稳定因子E1,. . .,En(称为E的HN-因子),其中φ(E1)> . . . > φ(En)(E1 → E是最大相位的子丛的类似物,等等)。
Stability conditions Definition. A stability condition σ is given by a pair (Z, P ), where Z : K0(D) → C is a homomorphism from the Grothendieck group K0(D) of D, and P is a slicing. Such a slicing is given by a collection of subcategories P (φ) of semistable objects of phase φ for each φ ∈ R, where Hom(P (φ1), P (φ2)) = 0 for φ1 > φ2, and P (φ)[1] = P (φ + 1). For an object E ∈ P (φ) we will use the notation φ(E) = φ. Similarly to the case of vector bundles, for each object E of D there should exist a Harder-Narasimhan filtration (HN-filtration), i.e., a collection of exact triangles building E from the semistable factors E1, . . . , En (called the HN-factors of E), where φ(E1) > . . . > φ(En) (E1 → E is an analog of the subbundle of maximal phase, etc.).