English

Tropical cycles and Chow polytopes

Algebraic Geometry 2010-06-01 v3 Combinatorics

Abstract

The Chow polytope of an algebraic cycle in a torus depends only on its tropicalisation. Generalising this, we associate a Chow polytope to any abstract tropical variety in a tropicalised toric variety. Several significant polyhedra associated to tropical varieties are special cases of our Chow polytope. The Chow polytope of a tropical variety XX is given by a simple combinatorial construction: its normal subdivision is the Minkowski sum of XX and a reflected skeleton of the fan of the ambient toric variety.

Keywords

Cite

@article{arxiv.1001.4784,
  title  = {Tropical cycles and Chow polytopes},
  author = {Alex Fink},
  journal= {arXiv preprint arXiv:1001.4784},
  year   = {2010}
}

Comments

22 pp, 3 figs. Added discussion of arbitrary ambient toric varieties; several improvements suggested by Eric Katz; some rearrangement

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