STRONG MARKED ISOSPECTRALITY OF AFFINE LORENTZIAN GROUPS

STRONG MARKED ISOSPECTRALITY OF AFFINE LORENTZIAN GROUPS
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仿射洛伦兹群的强显同谱性

DOI:
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发表时间:
2003
期刊:
影响因子:
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通讯作者:
Todd A. Drumm
Todd A. Drumm
中科院分区:
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文献类型:
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作者:
Virginie Charette;Todd A. Drumm

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Margulisinvariantis是H1(,R2,1)上的一个函数,其中是作用在R2,1上的一组不含椭圆元的Lorentz变换.的光谱是地图下所有2 Id的图像。如果的基本线性群是固定的,Drumm和Goldman证明了谱完全定义了平移部分。在本文中,我们加强了这一结果,证明了等谱性对给定秩的循环群的任意自由积都成立,直到R2,1的仿射变换群中的共轭,只要它是非辐射的,并且它的线性部分是离散的和非初等的。特别地,当线性部分是肖特基群时,等谱性成立。
The Margulis invariantis a function on H 1 ( , R 2,1 ), where is a group of Lorentzian transformations acting on R 2,1 , that contains no elliptic elements. The spectrum of is the image of all 2 Id un- der the map �. If the underlying linear group of is fixed, Drumm and Goldman proved that the spectrum defines the translational part com- pletely. In this note, we strengthen this result by showing that isospec- trality holds for any free product of cyclic groups of given rank, up to conjugation in the group of affine transformations ofR 2,1 , as long as it is non-radiant and that its linear part is discrete and non-elementary. In particular, isospectrality holds when the linear part is a Schottky group.