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arXiv 1201.0055quant-phhep-lathep-phhep-th
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粒子和场的连续路径积分的新方法

New Approach to Continuum Path Integrals for Particles and Fields

Takayasu Sekihara

摘要:

为了研究欧氏时空中粒子和场的量子涨落,提出了一种近似计算连续Feynman路径积分的方法。路径由高斯函数的和描述,并通过Metropolis方法用exp(-S)加权。加权光滑路径再现了一维谐振子基态的性质,精度在90%以上,并且使用更小的高斯函数宽度可以得到更高的精度。我们的方法应用于量子场论,四维U(1)和SU(2)规范场的量子涨落分别通过威尔逊圈提供了定性水平的库仑力和限制线性势.发现大值规范场的分布至少是指数地受到抑制。

英文摘要:

An approach to approximate evaluation of the continuum Feynman path integrals is developed for the study of quantum fluctuations of particles and fields in Euclidean time-space. The paths are described by sum of Gauss functions and are weighted with exp(-S) by the Metropolis method. The weighted smooth paths reproduce properties of the ground state of the harmonic oscillator in one dimension with more than about 90 % accuracy, and the accuracy gets higher by using smaller width of the Gauss functions. Our approach is applied to quantum field theories and quantum fluctuations of U(1) and SU(2) gauge fields in four dimensions respectively provide the Coulomb force and confining linear potential at qualitative levels via the Wilson loops. Distributions of large values of gauge fields are found to be suppressed at least exponentially.

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