【校级学术报告】Fourier multipliers on twisted crossed products

Quanhua Xu 许全华  (Université de Franche-Comté & Harbin Institute of Technology)

13:30-14:30, April 19, 2024   Science Building A503




Abstract:

Given a twisted W*-dynamic system $(\M, \a, \s, G)$, let $\M\rtimes_{\a, \s}G$ be the associated twisted crossed product. In this talk, we first consider permanent properties under twisted crossed product like injectivity and w*-amenability. The second part of the talk is devoted to the study of Fourier multipliers on $\M\rtimes_{\a, \s}G$. We give criteria of completely bounded $L_p$ Fourier multipliers and establish a link between Fourier and Schur multipliers. This talk is based on a joint work with Xiao Xiong and Kai Zeng.

About the speaker:

许全华教授,法国弗朗什-孔泰大学特级教授,并于2014被选为法兰西大学研究院院士,现任哈尔滨工业大学数学研究院院长。主要从事量子概率、算子空间及调和分析等方面的研究,在J. Amer. Math. Soc., Invent. Math., Duke Math. J.等刊物上发表论文80余篇,其中一些是开创性的奠基工作或有重大突破性的工作(国际公认的非交换鞅论的奠基人之一)。许全华教授曾在1997年和Gilles Pisier在非交换鞅论和非交换遍历理论方向率先取得了突破性的成果。随后,他于2007 年和Marius Junge 证明了非交换极大遍历不等式,解决了在量子概率方面的一个长达近30年的公开问题。另外,他还利用随机积分方法建立了向量值的Littlewood-Paley-Stein理论。

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