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arXiv 1003.0878gr-qcastro-ph.COhep-th
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以类空破缺矢量为特征的电动力学的普朗克尺度修正

Planck-scale modifications to Electrodynamics characterized by a space-like symmetry-breaking vector

Giulia Gubitosi, Giuseppe Genovese, Giovanni Amelino-Camelia, Alessandro Melchiorri

发表信息：
Phys.Rev.D82:024013,2010
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摘要：

在普朗克尺度（“量子引力诱导”）洛伦兹对称性破坏的研究中，迈尔斯和波斯佩洛夫引入的变形电动力学模型发挥了重要作用。它依赖于传统的有效量子场论，而且它用一个只在时间方向上有非零分量的四矢量来描述量子违反效应，这使它成为实验主义者的理想目标和许多理论家的自然概念测试场。然而，在这一点上，单一迈尔斯-波斯佩洛夫参数的实验极限，经过过去几年的稳步改进，是“超普朗克”，{ \it即}。他们从传统的量子引力观点出发，把模型从实际利益中拿出来。有鉴于此，我们在这里认为，它可能是适当的移动到下一个层次的复杂性，仍然与矢量对称破坏，但采用通用的四向量。我们还提供了一个初步的表征现象学的这个更一般的框架，足以暴露一个相当显着增加的复杂性，相对于原来的迈尔斯-波斯佩洛夫设置。大多数这些新的特征都与空间各向异性的存在有关，当破缺矢量是类空间时，空间各向异性尤其明显，它们会降低天体物理学中某些类型观测的定界能力。

英文摘要：

In the study of Planck-scale ("quantum-gravity induced") violations of Lorentz symmetry, an important role was played by the deformed-electrodynamics model introduced by Myers and Pospelov. Its reliance on conventional effective quantum field theory, and its description of symmetry-violation effects simply in terms of a four-vector with nonzero component only in the time-direction, rendered it an ideal target for experimentalists and a natural concept-testing ground for many theorists. At this point however the experimental limits on the single Myers-Pospelov parameter, after improving steadily over these past few years, are "super-Planckian", {\it i.e.} they take the model out of actual interest from a conventional quantum-gravity perspective. In light of this we here argue that it may be appropriate to move on to the next level of complexity, still with vectorial symmetry violation but adopting a generic four-vector. We also offer a preliminary characterization of the phenomenology of this more general framework, sufficient to expose a rather significant increase in complexity with respect to the original Myers-Pospelov setup. Most of these novel features are linked to the presence of spatial anisotropy, which is particularly pronounced when the symmetry-breaking vector is space-like, and they are such that they reduce the bound-setting power of certain types of observations in astrophysics.

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