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arXiv 1603.04772hep-thgr-qc
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背景相关重整化群中的背景无关性

Background independence in a background dependent renormalization group

Peter Labus, Tim R. Morris, Zoë H. Slade

摘要:

在共形约化引力的导数展开中,当且仅当反常维数为零或截断剖面为幂律时,修正的分裂沃德恒等式才与流动方程相容.如果沃德恒等式不相容,则不存在解。在兼容的情况下,一个明确的原因是发现为什么沃德恒等式仍然可以禁止不动点的存在,然而,对于任何截止剖面,一个背景独立(和参数化独立)的流动方程被发现。最后,扩展的顶点,合并后的方程一般成为过度约束或高度冗余超过六点的水平。

英文摘要:

Within the derivative expansion of conformally reduced gravity, the modified split Ward identities are shown to be compatible with the flow equations if and only if either the anomalous dimension vanishes or the cutoff profile is chosen to be power law. No solutions exist if the Ward identities are incompatible. In the compatible case, a clear reason is found for why Ward identities can still forbid the existence of fixed points; however, for any cutoff profile, a background independent (and parametrisation independent) flow equation is uncovered. Finally, expanding in vertices, the combined equations are shown generically to become either over-constrained or highly redundant beyond the six-point level.

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