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arXiv 2007.13506math.OAmath-phmath.FAmath.MP
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量子马尔可夫半群的完全梯度估计

Complete gradient estimates of quantum Markov semigroups

Melchior Wirth, Haonan Zhang

摘要:

本文对具有正规忠实迹态的von Neumann代数上的对称量子马尔可夫半群引入了一个完全梯度估计,它包含了熵关于最近引入的非交换2-Wasserstein距离的半凸性.我们证明了这种完全梯度估计在张量积和自由积下是稳定的,并证明了它对一些例子的有效性。作为应用,我们证明了自由群因子上Poisson型半群的一个具有最佳常数的完全修正对数Sobolev不等式。

英文摘要:

In this article we introduce a complete gradient estimate for symmetric quantum Markov semigroups on von Neumann algebras equipped with a normal faithful tracial state, which implies semi-convexity of the entropy with respect to the recently introduced noncommutative 2-Wasserstein distance. We show that this complete gradient estimate is stable under tensor products and free products and establish its validity for a number of examples. As an application we prove a complete modified logarithmic Sobolev inequality with optimal constant for Poisson-type semigroups on free group factors.

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