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arXiv 0905.1296math.OAmath.FA
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状态卷积半群

Convolution semigroups of states

J. Martin Lindsay, Adam Skalski

摘要:

量子群上状态的卷积半群形成局部紧群上概率测度的卷积半群的自然非交换类似物。在这里,我们提出了一个弱连续的卷积半群的理论,在一个C*-双代数,局部紧半群的非交换对应的泛函。在局部紧的量子群上,我们得到了这样的卷积半群与我们刻画的一类C_0-映射半群之间的双射对应。在离散型C ~*-双代数上,我们证明了所有弱连续的状态卷积半群都是范数自动连续的。作为应用,我们推出了紧群上连续条件正定埃尔米特函数的一个已知特征。

英文摘要:

Convolution semigroups of states on a quantum group form the natural noncommutative analogue of convolution semigroups of probability measures on a locally compact group. Here we initiate a theory of weakly continuous convolution semigroups of functionals on a C*-bialgebra, the noncommutative counterpart of locally compact semigroup. On locally compact quantum groups we obtain a bijective correspondence between such convolution semigroups and a class of C_0-semigroups of maps which we characterise. On C*-bialgebras of discrete type we show that all weakly continuous convolution semigroups of states are automatically norm-continuous. As an application we deduce a known characterisation of continuous conditionally positive-definite Hermitian functions on a compact group.

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