STRONG MARKED ISOSPECTRALITY OF AFFINE LORENTZIAN GROUPS
STRONG MARKED ISOSPECTRALITY OF AFFINE LORENTZIAN GROUPS
复制标题
仿射洛伦兹群的强显同谱性
DOI:
--
复制
发表时间:
2003
期刊:
影响因子:
--
通讯作者:
Todd A. Drumm
中科院分区:
文献类型:
--
作者:
Virginie Charette;Todd A. Drumm
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.