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arXiv 2010.04023math.AGmath.DG
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极化品种的价值稳定性

Valuative stability of polarised varieties

Ruadhaí Dervan, Eveline Legendre

摘要:

Fujita和Li用与估值相关的数量给出了Fano品种的K稳定性的特征,这对该领域的所有最近进展都是至关重要的。我们引入了一个概念的价值稳定性的任意极化品种,并表明它是等价的K-稳定性的测试配置与积分中心纤维。数值不变量管理估值稳定性是仿照藤田的β不变,但包括一项涉及的衍生物的体积。我们给出了几个例子的valuatively稳定和不稳定的品种,包括复曲面的情况。我们还讨论了delta不变量在研究极化簇的赋值稳定性和K-稳定性中所起的作用。

英文摘要:

Fujita and Li have given a characterisation of K-stability of a Fano variety in terms of quantities associated to valuations, which has been essential to all recent progress in the area. We introduce a notion of valuative stability for arbitrary polarised varieties, and show that it is equivalent to K-stability with respect to test configurations with integral central fibre. The numerical invariant governing valuative stability is modelled on Fujita's beta invariant, but includes a term involving the derivative of the volume. We give several examples of valuatively stable and unstable varieties, including the toric case. We also discuss the role that the delta invariant plays in the study of valuative stability and K-stability of polarised varieties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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