The Prym map on divisors, and the slope of A_5

Details The Prym map on divisors, and the slope of A_5 The Prym map on divisors, and the slope of A_5

2011-07-15

arxiv.org/abs/1107.3094v1

Mathematics

Algebraic Geometry

Scientific paper

In this paper we compute the pullback of divisor classes under the Prym map (extended to the boundary), and apply this result to get a lower bound on the slope of effective divisors on the perfect cone compactification of the moduli space of principally polarized abelian fivefolds. In the appendix by Klaus Hulek, the notion of slope for arbitrary toroidal compactifications is discussed, and the slope bound is shown to hold in general.

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