Breaking of Vainshtein screening in scalar-tensor theories beyond Horndeski
Breaking of Vainshtein screening in scalar-tensor theories beyond Horndeski
复制标题
超越 Horndeski 的标量张量理论中 Vainshtein 筛选的突破
DOI：
10.1103/physrevd.91.064013
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发表时间：
2015
影响因子：
5
通讯作者：
Daisuke Yamauchi
中科院分区：
文献类型：
--
作者：
Tsutomu Kobayashi;Yuki Watanabe;Daisuke Yamauchi
Horndeski引力理论被认为是最一般的标量-张量理论，它具有二阶场方程。最近，Gleyzdegal证明了Horndeski理论可以进一步推广，使得尽管场方程是三阶的，但传播自由度的数量保持不变。我们研究小尺度引力的广义Horndeski理论，特别是在新的衍生相互作用超越Horndeski的Vainshtein筛选机制的影响。在没有五次Galileon项及其推广的情况下，我们证明了新的相互作用并没有改变源外和源附近引力的定性行为：两个度规势重合，而引力耦合由宇宙学势给出，因此一般是依赖于时间的。然而，我们发现，由于Horndeski之外的相互作用，源内部的引力场表现出一种新的行为：引力吸引力不仅仅取决于封闭的质量，两个势不重合，表明屏蔽机制被打破。
The Horndeski theory of gravity is known as the most general scalar-tensor theory with second-order field equations. Recently, it was demonstrated by Gleyzeset al.that the Horndeski theory can further be generalized in such a way that although field equations are of third order, the number of propagating degrees of freedom remains the same. We study small-scale gravity in the generalized Horndeski theory, focusing in particular on an impact of the new derivative interaction beyond Horndeski on the Vainshtein screening mechanism. In the absence of the quintic Galileon term and its generalization, we show that the new interaction does not change the qualitative behavior of gravity outside and near the source: the two metric potentials coincide,, while the gravitational coupling is given by the cosmological one and hence is time dependent in general. We find, however, that the gravitational field inside the source shows a novel behavior due to the interaction beyond Horndeski: the gravitational attraction is not determined solely from the enclosed mass and two potentials do not coincide, indicating breaking of the screening mechanism.