Openness of splinter loci in prime characteristic

Openness of splinter loci in prime characteristic
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主要特征中分裂位点的开放性

DOI:
10.1016/j.jalgebra.2023.03.025
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发表时间:
2023
期刊:
影响因子:
0.9
通讯作者:
Tucker, Kevin
Tucker, Kevin
中科院分区:
数学3区
文献类型:
--
作者:
Datta, Rankeya;Tucker, Kevin

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A splinter is a notion of singularity that has seen numerous recent applications, especially in connection with the direct summand theorem, the mixed characteristic minimal model program, Cohen–Macaulayness of absolute integral closures and cohomology vanishing theorems. Nevertheless, many basic questions about these singularities remain elusive. One outstanding problem is whether the splinter property spreads from a point to an open neighborhood of a noetherian scheme. Our paper addresses this problem in prime characteristic, where we show that a locally noetherian scheme that has finite Frobenius or that is locally essentially of finite type over a quasi-excellent local ring has an open splinter locus. In particular, all varieties over fields of positive characteristic have open splinter loci. Intimate connections are established between the openness of splinter loci andF-compatible ideals, which are prime characteristic analogues of log canonical centers. We prove the surprising fact that for a large class of noetherian rings with pure (aka universally injective) Frobenius, the splinter condition is detected by the splitting of a single generically étale finite extension. We also show that for a noetherianN-graded ring over a field, the homogeneous maximal ideal detects the splinter property.
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