Semistable reduction for overconvergent F-isocrystals on a curve

Details Semistable reduction for overconvergent F-isocrystals on a curve Semistable reduction for overconvergent F-isocrystals on a curve

2002-02-23

arxiv.org/abs/math/0202247v3

preprint; published version: Math. Res. Lett. 10 (2003), 151-159.

Mathematics

Number Theory

9 pages; v3: final journal version. To appear in Mathematical Research Letters

Scientific paper

Given a smooth affine curve X over a field k of positive characteristic, and an overconvergent F-isocrystal on X, we prove after replacing k by a finite purely inseparable extension, there exists a finite separable cover of X, the pullback of the isocrystal along which extends to a log-F-isocrystal on a smooth compactification. This resolves a weak form of the global version of a conjecture of Crew; the proof uses the local version of the conjecture, established separately by Andre, Mebkhout and the author.

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