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arXiv 0811.3962gr-qc
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d维空间中的DeWitt-Schwinger重整化和真空极化

DeWitt-Schwinger Renormalization and Vacuum Polarization in d Dimensions

Robert T. Thompson, José P. S. Lemos

摘要:

真空极化$<ϕ^2(x)>$和应力张量期望值$<T_{μν}(x)>$的计算最近又重新兴起,特别是在黑洞时空中。迄今为止,大多数这类计算都是在四维空间中进行的。将这些计算扩展到$d$维包括$d$维重整化。通常情况下,重整化项是从克里斯滕森的协变点分裂方法的德维特-施温格展开。然而,需要进行一些操作,以将正确的项转换为与真空极化类型的问题相容的形式。本文回顾了$<ϕ^2(x)>$和$<T_{μν}(x)>$计算的现状,并详细介绍了计算$<ϕ^2(x)>$的方法,导出了适用于偶维时空的DeWitt-Schwinger重整化项的简洁表达式。这个公式对于偶数维的$<ϕ^2(x)>$和$<T_{μν}(x)>$的计算应该是有用的,并且对于四维和六维的重整化项被明确地示出。此外,使用有限项的德威特-施温格展开作为一个近似$<ϕ^2(x)>$为某些时空进行了讨论,与应用程序的四维和五维。

英文摘要:

Calculation of the vacuum polarization, $<ϕ^2(x)>$, and expectation value of the stress tensor, $<T_{μν}(x)>$, has seen a recent resurgence, notably for black hole spacetimes. To date, most calculations of this type have been done only in four dimensions. Extending these calculations to $d$ dimensions includes $d$-dimensional renormalization. Typically, the renormalizing terms are found from Christensen's covariant point splitting method for the DeWitt-Schwinger expansion. However, some manipulation is required to put the correct terms into a form that is compatible with problems of the vacuum polarization type. Here, after a review of the current state of affairs for $<ϕ^2(x)>$ and $<T_{μν}(x)>$ calculations and a thorough introduction to the method of calculating $<ϕ^2(x)>$, a compact expression for the DeWitt-Schwinger renormalization terms suitable for use in even-dimensional spacetimes is derived. This formula should be useful for calculations of $<ϕ^2(x)>$ and $<T_{μν}(x)>$ in even dimensions, and the renormalization terms are shown explicitly for four and six dimensions. Furthermore, use of the finite terms of the DeWitt-Schwinger expansion as an approximation to $<ϕ^2(x)>$ for certain spacetimes is discussed, with application to four and five dimensions.

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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