期刊
ISRAEL JOURNAL OF MATHEMATICS
卷 226, 期 1, 页码 29-69出版社
HEBREW UNIV MAGNES PRESS
DOI: 10.1007/s11856-018-1682-4
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Consider a family of K3 surfaces over a hyperbolic curve (i.e., Riemann surface). Their second cohomology groups form a local system, and we show that its top Lyapunov exponent is a rational number. One proof uses the Kuga-Satake construction, which reduces the question to Hodge structures of weight 1. A second proof uses integration by parts. The case of maximal Lyapunov exponent corresponds to modular families coming from the Kummer construction.
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