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arXiv 1104.1373hep-th
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大质量引力“辅助额外维”模型的精确解

Exact Solution to the "Auxiliary Extra Dimension" Model of Massive Gravity

S. F. Hassan, Rachel A. Rosen

摘要:

“辅助额外维度”模型的提出是为了对广义相对论的修正,特别是对非线性质量引力提供一种几何解释。在这种情况下,理论被证明是鬼免费的三阶扰动,在去耦极限。在这项工作中,我们精确地解决了额外的维度的运动方程,以获得一个纯粹的四维理论。使用这种解决方案,它表明,鬼出现在四阶及以上。我们探讨潜在的修改,以解决幽灵的问题,并发现其一致的实施需要超越目前的框架。

英文摘要:

The "Auxiliary Extra Dimension" model was proposed in order to provide a geometrical interpretation to modifications of general relativity, in particular to non-linear massive gravity. In this context, the theory was shown to be ghost free to third order in perturbations, in the decoupling limit. In this work, we exactly solve the equation of motion in the extra dimension, to obtain a purely 4-dimensional theory. Using this solution, it is shown that the ghost appears at the fourth order and beyond. We explore potential modifications to address the ghost issue and find that their consistent implementation requires going beyond the present framework.

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