烟囱,豹斑,巴斯马吉安和布里奇曼的身份
Chimneys, leopard spots, and the identities of Basmajian and Bridgeman
摘要:
我们给出了一个简单的几何参数,以一种共同的方式推导出Basmajian和Bridgeman的正交谱恒等式。我们的方法也大大简化了确定这些身份的被加数。例如,对每一个奇数n,存在一个2(n-2)次有理函数q_n,使得如果M是一个具有全测地边界S的n维紧致双曲流形,则存在一个恒等式χ(S)= \sum_i q_n(e^{l_i}),其中和取在M的正交谱上。当n=3时,这具有显式形式\sum_i 1/(e^{2l_i}-1)= -x(S)/4。
英文摘要:
We give a simple geometric argument to derive in a common manner orthospectrum identities of Basmajian and Bridgeman. Our method also considerably simplifies the determination of the summands in these identities. For example, for every odd integer n, there is a rational function q_n of degree 2(n-2) so that if M is a compact hyperbolic manifold of dimension n with totally geodesic boundary S, there is an identity χ(S) = \sum_i q_n(e^{l_i}) where the sum is taken over the orthospectrum of M. When n=3, this has the explicit form \sum_i 1/(e^{2l_i}-1) = -χ(S)/4.
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