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arXiv 0901.0393hep-thgr-qchep-ph
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大质量引力退耦极限中的Vainshtein机制

The Vainshtein mechanism in the Decoupling Limit of massive gravity

E. Babichev, C. Deffayet, R. Ziour

摘要:

研究了非线性大质量引力的静态球对称解。首先,我们确定,在一个anastomic适合于这些解决方案的研究,模拟的解耦限制(DL),已被用于戈德斯通图片描述。我们表明,在DL中留下的方程组具有正规的解决方案,具有类似于Vainshtein恢复的解决方案的广义相对论(GR)。因此,发现积分整个非线性方程组时出现的奇异性在DL中不存在,尽管这些奇异性通常被认为是由于在该极限中也可以看到的负能量模式。此外,我们表明,在小半径的Vainshtein的缩放只是一个限制的情况下,在一个无限的家庭的非奇异的解决方案,每个显示Vainshtein恢复GR解决方案的Vainshtein半径以下,但不同的共同缩放在小距离。这种新的缩放被示出为与在DL中留下的非线性的零模式相关联。我们还表明,在DL中,这种缩放允许GR解决方案的恢复,即使是原来的Vainshtein机制不工作的潜力。我们的结果意味着,要么DL错过了一些重要的功能,非线性质量引力或重要功能的解决方案的完整的非线性理论被忽视。它们还可能为DGP模式和相关提案带来有趣的成果。

英文摘要:

We investigate static spherically symmetric solutions of nonlinear massive gravities. We first identify, in an ansatz appropriate to the study of those solutions, the analog of the decoupling limit (DL) that has been used in the Goldstone picture description. We show that the system of equations left over in the DL has regular solutions featuring a Vainshtein-like recovery of solutions of General Relativity (GR). Hence, the singularities found to arise integrating the full nonlinear system of equations are not present in the DL, despite the fact those singularities are usually thought to be due to a negative energy mode also seen in this limit. Moreover, we show that the scaling conjectured by Vainshtein at small radius is only a limiting case in an infinite family of non singular solutions each showing a Vainshtein recovery of GR solutions below the Vainshtein radius but a different common scaling at small distances. This new scaling is shown to be associated with a zero mode of the nonlinearities left over in the DL. We also show that, in the DL, this scaling allows for a recovery of GR solutions even for potentials where the original Vainshtein mechanism is not working. Our results imply either that the DL misses some important features of nonlinear massive gravities or that important features of the solutions of the full nonlinear theory have been overlooked. They could also have interesting outcomes for the DGP model and related proposals.

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