Massive and modified gravity as self-gravitating media
Massive and modified gravity as self-gravitating media
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DOI：
10.1103/physrevd.94.124023
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发表时间：
2016-12-19
影响因子：
5
通讯作者：
Pilo, Luigi
中科院分区：
文献类型：
--
作者：
Ballesteros, Guillermo;Comelli, Denis;Pilo, Luigi
研究了描述自引力介质低能物理的有效场论。场内容由四个导数耦合的标量场组成，可以用介质的内部共动坐标来识别。利用SO(3)内部空间不变性，该理论描述了超固体。更强的对称性要求导致超流体、固体和完美流体在导数中处于最低阶。在统一规范中，出现了大质量引力，因此是连续介质在时空中传播的结果。我们的结果可以用于系统地探索在大距离上持续改变重力的影响和特征。然后将暗扇区描述为一种自引力介质，具有由内部对称性决定的动力学和热力学性质。这些结果表明，在大距离尺度上，暗能量和修正引力之间的区别只是一种尺度选择。
We study the effective field theory that describes the low-energy physics of self-gravitating media. The field content consists of four derivatively coupled scalar fields that can be identified with the internal comoving coordinates of the medium. Imposing SO(3) internal spatial invariance, the theory describes supersolids. Stronger symmetry requirements lead to superfluids, solids and perfect fluids, at lowest order in derivatives. In the unitary gauge, massive gravity emerges, being thus the result of a continuous medium propagating in spacetime. Our results can be used to explore systematically the effects and signatures of modifying gravity consistently at large distances. The dark sector is then described as a self-gravitating medium with dynamical and thermodynamic properties dictated by internal symmetries. These results indicate that the divide between dark energy and modified gravity, at large distance scales, is simply a gauge choice.