The Dixmier problem, lamplighters and Burnside groups
The Dixmier problem, lamplighters and Burnside groups
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DOI:
10.1016/j.jfa.2009.06.029
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发表时间:
2009-02
影响因子:
1.7
通讯作者:
N. Monod;N. Ozawa
中科院分区:
文献类型:
--
作者:
N. Monod;N. Ozawa
J. Dixmier asked in 1950 whether every non-amenable group admits uniformly bounded representations that cannot be unitarised. We provide such representations upon passing to extensions by abelian groups. This gives a new characterisation of amenability. Furthermore, we deduce that certain Burnside groups are non-unitarisable, answering a question raised by G. Pisier.