Orthospectra of geodesic laminations and dilogarithm identities on moduli space
Orthospectra of geodesic laminations and dilogarithm identities on moduli space
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DOI:
10.2140/gt.2011.15.707
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发表时间:
2009-03
影响因子:
2
通讯作者:
M. Bridgeman
中科院分区:
文献类型:
--
作者:
M. Bridgeman
.We define the function LW T1.S/!S by letting L.v/D Length..v// . We note that L.v/ is measurable but can be infinite. We define measure M on the real line by M D L . Then M is a measure describing the distribution of the lengths of .v/ . We cut S along to obtain a surface with boundary denoted S . A ‐cusp of S is an ideal vertex of a component of S . We let N be the number of ‐cusps of S . We denote byf ig the geodesic arcs in S which have endpoints perpendicular to @S and denote the length of i by li . We note that if a component of S is an ideal k ‐gon then there are a finite number of geodesics i in this component. Otherwise there are an infinite number. We call the setflig (with multiplicities) the ‐orthospectrum. By doubling S we see that the ‐orthospectrum corresponds to a subset of the closed geodesics of a finite area surface and therefore is a countable set. We prove the following length spectrum identity