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Contractivity properties of Ornstein-Uhlenbeck semigroup for general commutation relations

机译:一般换向关系的Ornstein-Uhlenbeck半群的收缩性质

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摘要

We study a certain class of von Neumann algebras generated by selfadjoint elements omega(i) = a(i) + a(i)(+), where a(i), a(i)(+) satisfy the general commutation relations:a(i)a(j)(+) = Sigma(r,s) t(js)(ir) a(r) + a(s) + delta(ij)Id.We assume that operator T for which the constants t(js)(ir) are matrix coefficients satisfies the braid relation. Such algebras were investigated in [BSp] and [ K] where the positivity of the Fock representation and factoriality were shown. In this paper we prove that T-Ornstein-Uhlenbeck semigroup U-t = Gamma(T) (e(-t)), t > 0 arising from the second quantization procedure is hyper- and ultracontractive. The optimal bounds for hypercontractivity are also discussed.
机译:我们研究由自伴元素omega(i)= a(i)+ a(i)(+)生成的一类冯·诺依曼代数,其中a(i),a(i)(+)满足一般的换向关系: a(i)a(j)(+)= Sigma(r,s)t(js)(ir)a(r)+ a(s)+ delta(ij)Id。我们假设其常数为算子T t(js)(ir)是满足编织关系的矩阵系数。在[BSp]和[K]中研究了此类代数,其中显示了Fock表示的正性和阶乘。在本文中,我们证明T-Ornstein-Uhlenbeck半群U-t = Gamma(T)(e(-t)),第二个量化过程引起的t> 0具有超收缩性和超收缩性。还讨论了超收缩性的最佳界限。

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