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arXiv 0910.4756gr-qcastro-ph.COhep-th
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过去光锥的体积与Paneitz算子

The Volume of the Past Light-Cone and the Paneitz Operator

Sohyun Park, R. P. Woodard

摘要:

研究了一个关于从任意观测点到固定初值曲面的过去光锥的不变体积的猜想。猜想共形反常理论中的一个四阶微分算子作用在过去光锥的不变体积上时,给出了$8π$。我们证明了一个扩展版本的猜想是有效的任意均匀和各向同性的几何。关于平坦时空的一阶微扰理论揭示了对该猜想的违反,然而,对于爱因斯坦方程的任何真空解,该猜想都消失了。这些结果对于构造量子引力观测量、量化时空膨胀的反作用以及建立具有类时矢量场特征的交替引力模型可能具有重要意义。

英文摘要:

We study a conjecture involving the invariant volume of the past light-cone from an arbitrary observation point back to a fixed initial value surface. The conjecture is that a 4th order differential operator which occurs in the theory of conformal anomalies gives $8π$ when acted upon the invariant volume of the past light-cone. We show that an extended version of the conjecture is valid for an arbitrary homogeneous and isotropic geometry. First order perturbation theory about flat spacetime reveals a violation of the conjecture which, however, vanishes for any vacuum solution of the Einstein equation. These results may be significant for constructing quantum gravitational observables, for quantifying the back-reaction on spacetime expansion and for alternate gravity models which feature a timelike vector field.

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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