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arXiv 0809.0652hep-th
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世界线形式中的带边界标量热核

Scalar heat kernel with boundary in the worldline formalism

Fiorenzo Bastianelli, Olindo Corradini, Pablo A. G. Pisani, Christian Schubert

摘要:

近年来,世界线形式主义已经成为计算有效作用量和热核的有力工具。然而,实现非平凡的边界条件,在这种形式主义已被证明是一个困难的问题。最近,在利用镜像荷将相应的世界线路径积分推广到全R^D的基础上,发展了半空间R_+ x R^{D-1}上标量场的推广.我们在这里提出了一个改进的版本,这种形式主义,使我们能够写下非递归的主公式的n点贡献的热核跟踪的标量场的半空间上的Dirichlet或Neumann边界条件。这些主公式适合于电算化。通过计算半空间的两个新的热核系数a_4和a_{9/2},我们证明了形式主义的有效性。

英文摘要:

The worldline formalism has in recent years emerged as a powerful tool for the computation of effective actions and heat kernels. However, implementing nontrivial boundary conditions in this formalism has turned out to be a difficult problem. Recently, such a generalization was developed for the case of a scalar field on the half-space R_+ x R^{D-1}, based on an extension of the associated worldline path integral to the full R^D using image charges. We present here an improved version of this formalism which allows us to write down non-recursive master formulas for the n-point contribution to the heat kernel trace of a scalar field on the half-space with Dirichlet or Neumann boundary conditions. These master formulas are suitable to computerization. We demonstrate the efficiency of the formalism by a calculation of two new heat-kernel coefficients for the half-space, a_4 and a_{9/2}.

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。

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