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Irreducible cycles and points in special position in moduli spaces for tropical curves

By Andreas Gathmann and Franziska Schroeter

Abstract

In the first part of this paper, we discuss the notion of irreducibility of cycles in the moduli spaces of n-marked rational tropical curves. We prove that Psi-classes and vital divisors are irreducible, and that locally irreducible divisors are also globally irreducible for n \leq 6. In the second part of the paper, we show that the locus of point configurations in (\R^2)^n in special position for counting rational plane curves (defined in two different ways) can be given the structure a tropical cycle of codimension 1. In addition, we compute explicitly the weights of this cycle.Comment: 31 pages, minor changes to match the published versio

Topics: Mathematics - Algebraic Geometry, Mathematics - Combinatorics, Primary 14N10, 14T05
Year: 2013
OAI identifier: oai:arXiv.org:1104.3307
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