Polynomiality, wall crossings and tropical geometry of rational double Hurwitz cycles
Polynomiality, wall crossings and tropical geometry of rational double Hurwitz cycles
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有理双赫尔维茨循环的多项式、穿墙和热带几何
DOI:
10.1016/j.jcta.2013.05.010
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发表时间:
2013
期刊:
影响因子:
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通讯作者:
Hannah Markwig
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文献类型:
--
作者:
Aaron Bertram;Renzo Cavalieri;Hannah Markwig
We study rational double Hurwitz cycles, i.e. loci of marked rational stable curves admitting a map to the projective line with assigned ramification profiles over two fixed branch points. Generalizing the phenomenon observed for double Hurwitz numbers, such cycles are piecewise polynomial in the entries of the special ramification; the chambers of polynomiality and wall crossings have an explicit and “modular” description. A main goal of this paper is to simultaneously carry out this investigation for the corresponding objects in tropical geometry, underlining a precise combinatorial duality between classical and tropical Hurwitz theory.
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Journal of Combinatorial Theory
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