Chimneys, leopard spots, and the identities of Basmajian and Bridgeman
Chimneys, leopard spots, and the identities of Basmajian and Bridgeman
复制标题
烟囱、豹斑以及巴斯马吉安和布里奇曼的身份
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发表时间:
2010
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通讯作者:
Danny Calegari
中科院分区:
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作者:
Danny Calegari
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 chi(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) = -chi(S)/4.