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arXiv 0905.2446gr-qchep-th
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作为量子有效场论的爱因斯坦-以太

Einstein-aether as a quantum effective field theory

Benjamin Withers

摘要:

洛伦兹对称性在引力过程中被破坏的可能性相对来说不受实验的限制,这与洛伦兹对称性在物质领域被证实的准确程度形成了鲜明的对比。引力场中洛伦兹破坏的一个模型是爱因斯坦-以太理论,在这个理论中,洛伦兹对称性通过给动力学矢量场一个真空期望值而被破坏。本文分析了量子化引力微扰和以太微扰的有效理论。我们表明,这个理论具有一个控制的有效扩展内尺寸正规化,也就是说,对于任何过程有一个有限数量的费曼图,这将有助于一个给定的顺序的准确性。我们发现,有没有日志运行的两个衍生物的唯象参数,证明使用这些参数的实验约束在许多数量级的能量尺度。给出了二阶导数洛伦兹破坏算子的严格的实验界,我们估计了由于回路效应引起的物质洛伦兹破坏的大小。这相当于对违反洛伦兹的六维物质算符的系数的自然大小的估计,这反过来又可以用来获得该理论的二阶导数参数的新界限。

英文摘要:

The possibility that Lorentz symmetry is violated in gravitational processes is relatively unconstrained by experiment, in stark contrast with the level of accuracy to which Lorentz symmetry has been confirmed in the matter sector. One model of Lorentz violation in the gravitational sector is Einstein-aether theory, in which Lorentz symmetry is broken by giving a vacuum expectation value to a dynamical vector field. In this paper we analyse the effective theory for quantised gravitational and aether perturbations. We show that this theory possesses a controlled effective expansion within dimensional regularisation, that is, for any process there are a finite number of Feynman diagrams which will contribute to a given order of accuracy. We find that there is no log-running of the two-derivative phenomenological parameters, justifying the use of experimental constraints for these parameters obtained over many orders of magnitude in energy scale. Given the stringent experimental bounds on two-derivative Lorentz-violating operators, we estimate the size of matter Lorentz-violation which arises due to loop effects. This amounts to an estimation of the natural size of coefficients for Lorentz-violating dimension-six matter operators, which in turn can be used to obtain a new bound on the two-derivative parameters of this theory.

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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