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arXiv math/9910112math.QAmath-phmath.MPmath.SG
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关于 *-代数的正变形

On Positive Deformations of *-Algebras

Henrique Bursztyn, Stefan Waldmann

摘要:

出于变形量子化,我们考虑有序环上的$^*$ -代数和它们的变形:我们调查正式的结合变形兼容的$^*$ -对合和讨论的上同调描述的Hermitian Hochschild上同调。作为一个有序的环允许一个有意义的定义的正泛函和作为正式的幂级数系数在一个有序的环再次是一个有序的环,我们定义一个变形是积极的,如果任何积极的线性泛函的未变形代数可以变形为一个积极的线性泛函的变形代数。我们讨论了各种例子,并特别证明了辛流形上的星积是正变形。

英文摘要:

Motivated by deformation quantization we consider $^*$-algebras over ordered rings and their deformations: we investigate formal associative deformations compatible with the $^*$-involution and discuss a cohomological description in terms of a Hermitian Hochschild cohomology. As an ordered ring allows for a meaningful definition of positive functionals and as the formal power series with coefficients in an ordered ring are again an ordered ring we define a deformation to be positive if any positive linear functional of the undeformed algebra can be deformed into a positive linear functional of the deformed algebra. We discuss various examples and prove in particular that star products on symplectic manifolds are positive deformations.

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