On cocycle superrigidity for Gaussian actions
On cocycle superrigidity for Gaussian actions
复制标题
高斯作用的余循环超刚性
DOI:
10.1017/s0143385710000751
复制
发表时间:
2009
影响因子:
0.9
通讯作者:
Thomas Sinclair
中科院分区:
文献类型:
--
作者:
J. Peterson;Thomas Sinclair
Abstract We present a general setting to investigate ?fin-cocycle superrigidity for Gaussian actions in terms of closable derivations on von Neumann algebras. In this setting we give new proofs to some ?fin-cocycle superrigidity results of S. Popa and we produce new examples of this phenomenon. We also use a result of K. R. Parthasarathy and K. Schmidt to give a necessary cohomological condition on a group representation in order for the resulting Gaussian action to be ?fin-cocycle superrigid.