arXivDaily arXiv每日学术速递 周一至周五更新
看起来今天可以划水了
arXiv 0708.3115hep-thgr-qcmath-phmath.MP
收藏

功能时间演化、Anomaly电位和几何相位

Functional Time Evolution, Anomaly Potentials, and the Geometric Phase

C. G. Torre

摘要:

1+1维自由量子场允许沿任意时空叶理的么正薛定谔图像动力学由柯西曲线表示。库查尔指出,薛定谔图像态矢量,被看作类空嵌入的泛函,满足泛函薛定谔方程,其中时间演化的生成元是具有特定正规序和(非唯一)c数贡献的标量场能量动量密度。薛定谔方程的c数贡献,称为“异常势”,需要使方程在正常有序能量-动量密度的分解子中存在的Schwinger项下可积。这里我们给出反常势的量子几何解释。特别是,我们表明异常势对应于在规范的自然连接上的真空状态的丛柯西曲线嵌入到时空的空间。这种联系的完整性是与动力学演化相关的几何相位,沿着由正常有序的能量-动量密度产生的嵌入空间中的闭合路径。泛函薛定谔方程中反常势的存在提供了一个动力学相位,它消除了这种完整性,因此在嵌入空间中,围绕闭环的量子输运没有净相位变化。

英文摘要:

A free quantum field in 1+1 dimensions admits unitary Schrodinger picture dynamics along any foliation of spacetime by Cauchy curves. Kuchar showed that the Schrodinger picture state vectors, viewed as functionals of spacelike embeddings, satisfy a functional Schrodinger equation in which the generators of time evolution are the scalar field energy-momentum densities with a particular normal-ordering and with a (non-unique) c-number contribution. The c-number contribution to the Schrodinger equation, called the ``anomaly potential'', is needed to make the equation integrable in light of the Schwinger terms present in the commutators of the normal-ordered energy-momentum densities. Here we give a quantum geometric interpretation of the anomaly potential. In particular, we show the anomaly potential corresponds to the expression in a gauge of the natural connection on the bundle of vacuum states over the space of embeddings of Cauchy curves into the spacetime. The holonomy of this connection is the geometric phase associated with dynamical evolution along a closed path in the space of embeddings generated by the normal-ordered energy-momentum densities. The presence of the anomaly potential in the functional Schrodinger equation provides a dynamical phase which removes this holonomy, so that there is no net phase change for quantum transport around closed loops in the space of embeddings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑