报告题目:The rigidity of irrational pseudo-rotations on the two-torus
报告人:王俭 南开大学陈省身数学研究所
报告时间:2017年8月 28日(星期一)上午10:30-11:30
报告地点:创新园大厦A1101
校内联系人:王文栋 联系电话:84708351-8139
摘要:
In this talk, we show that under certain boundedness condition, a Cr conservative irrational pseudo-rotations on T2with a generic rotation vector is Cr-1-rigid. These provide a partial generalization of the main results in [B. Bramham, Invent. Math. (2015); A. Avila, B. Fayad, P. Le Calvez, D. Xu and Z. Zhang, arXiv: 1509.06906v1]. Furthermore, we construct a C∞ conservative totaly irrational pseudo-rotation with a super-Liouvillean vector and bounded mean motion that is not conjugate to an irrational rotation by the classical Anosov-Katok method. Combining with a theorem of Jäger, we give a negative answer to a longstanding question of A. Norton and D. Sullivan in the C∞ category.
报告人介绍:
王俭,2012年获得巴黎第十三大学-清华大学联合培养博士学位,2012-2014在南开大学陈省身数学研究所做博士后, 2014-2017在南开大学陈省身数学研究所-德国马普所做联合培养博士后。目前研究兴趣主要集中在动力系统以及辛几何。曾获清华大学优秀博士学位论文一等奖。目前在国际知名杂志Proc. Amer. Math. Soc. , Trans. Amer. Math. Soc. 等发表多篇论文。