Hurwitz correspondences on compactifications of M0,N

Hurwitz correspondences on compactifications of M0,N
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M0,N 紧化的 Hurwitz 对应

DOI:
10.1016/j.aim.2017.10.044
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发表时间:
2018
影响因子:
1.7
通讯作者:
Rohini Ramadas
Rohini Ramadas
中科院分区:
数学1区
文献类型:
--
作者:
Rohini Ramadas

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Hurwitz对应是模空间M0,N的某些多值自映射,它们是在研究瑟斯顿关于有理函数的拓扑刻画时产生的。我们比较了两种不同的紧化M0,N上的Hurwitz对应H的动力学:Deligne-Mumford紧化M‾0,N,以及加权稳定曲线的Hassett空间。利用这一比较,我们证明了H的第k次动态度是H在H2 k(M‾0,N)的自然商上诱导的推进的优势本征值的绝对值.
Hurwitz correspondences are certain multi-valued self-maps of the moduli space M 0, N. They arise in the study of Thurston's topological characterization of rational functions. We compare the dynamics of Hurwitz correspondence H on two different compactifications of M 0, N: the Deligne-Mumford compactification M‾ 0, N, as well as a Hassett space of weighted stable curves. We use this comparison to show that the k-th dynamical degree of H is the absolute value of the dominant eigenvalue of the pushforward induced by H on a natural quotient of H 2 k (M‾ 0, N).
DOI: 10.1017/etds.2018.125
发表时间: 2020
影响因子: 0.9
作者:
RAMADAS, ROHINI
通讯作者: RAMADAS, ROHINI