Endomorphisms of superelliptic jacobians

Details Endomorphisms of superelliptic jacobians Endomorphisms of superelliptic jacobians

2006-04-30

arxiv.org/abs/math/0605028v4

Mathematics

Algebraic Geometry

17 pages. Final version; to appear in the Mathematische Zeitschrift

Scientific paper

10.1007/s00209-008-0342-5

Let K be a field of characteristic zero, n>4 an integer, f(x) an irreducible polynomial over K of degree n, whose Galois group is doubly transitive simple non-abelian group. Let p be an odd prime, Z[\zeta_p] the ring of integers in the p-th cyclotomic field, C_{f,p}:y^p=f(x) the corresponding superelliptic curve and J(C_{f,p}) its jacobian. Assuming that either n=p+1 or p does not divide n(n-1), we prove that the ring of all endomorphisms of J(C_{f,p}) coincides with Z[\zeta_p].

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