Equidistribution of Weierstrass points on curves over non-Archimedean fields

preprint2014arXivOpen access

Abstract

We prove equidistribution of Weierstrass points on Berkovich curves. Let XX be a smooth proper curve of positive genus over a complete algebraically closed non-Archimedean field KK of equal characteristic zero with a non-trivial valuation. Let LL be a line bundle of positive degree on XX. The Weierstrass points of powers of LL are equidistributed according to the Zhang-Arakelov measure on the analytification XanX^{an}. This provides a non-Archimedean analogue of a theorem of Mumford and Neeman. Along the way we provide a description of the reduction of Weierstrass points, answering a question of Eisenbud and Harris.

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