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arXiv 2102.00478gr-qchep-th
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弯曲时空中Maxwell理论应力-能量张量发散部分的系统推导

Divergent part of the stress-energy tensor for Maxwell's theory in curved space-time: a systematic derivation

Roberto Niardi, Giampiero Esposito, Francesco Tramontano

摘要:

本文研究了弯曲时空中麦克斯韦理论的费曼格林函数,利用Fock-Schwinger-DeWitt渐近展开,然后应用点分裂方法,因为它是正则化发散可观测量的一个有价值的工具。其中,应力-能量张量是用阿达玛格林函数的二阶协变导数表示的,它也与有效作用量密切相关;因此人们得到了应力-能量张量的级数展开。它的发散部分可以被分离出来,并得到一个简明的公式:通过量纲分析和组合学,可以得到两类项:曲率张量(Riemann,Ricci张量和标量曲率)的二次项和它们的二阶协变导数的线性项。这个公式对任何时空度规都成立;在与物理相关的特殊情况下,如Ricci平坦空间和最大对称空间,它会变得更加明确,并在一些物理上感兴趣的例子中得到充分的评价:克尔度规和史瓦西度规以及德西特时空。

英文摘要:

In this paper the Feynman Green function for Maxwell's theory in curved space-time is studied by using the Fock-Schwinger-DeWitt asymptotic expansion; the point-splitting method is then applied, since it is a valuable tool for regularizing divergent observables. Among these, the stress-energy tensor is expressed in terms of second covariant derivatives of the Hadamard Green function, which is also closely linked to the effective action; therefore one obtains a series expansion for the stress-energy tensor. Its divergent part can be isolated, and a concise formula is here obtained: by dimensional analysis and combinatorics, there are two kinds of terms: quadratic in curvature tensors (Riemann, Ricci tensors and scalar curvature) and linear in their second covariant derivatives. This formula holds for every space-time metric; it is made even more explicit in the physically relevant particular cases of Ricci-flat and maximally symmetric spaces, and fully evaluated for some examples of physical interest: Kerr and Schwarzschild metrics and de Sitter space-time.

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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