Vainshtein mechanism in second-order scalar-tensor theories
Vainshtein mechanism in second-order scalar-tensor theories
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DOI：
10.1103/physrevd.85.044059
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发表时间：
2011-11
影响因子：
5
通讯作者：
A. D. Felice;R. Kase;S. Tsujikawa
中科院分区：
文献类型：
--
作者：
A. D. Felice;R. Kase;S. Tsujikawa
在二阶标量张量理论中，我们研究了Vainshtein机制如何在有物质源的球对称背景中工作。在场F(\Phi)=e^{-2q\Phi}$与Ricci标量$R$耦合的情况下，我们一般地推导出Vainshtein半径，在这个半径内，即使对于单位阶的耦合$Q$，一般相对论行为也可以恢复。我们的分析涵盖了膨胀子场自作用的扩展伽利略理论和Brans-Dicke理论等模型。我们证明，如果这些模型对今天的宇宙加速负有责任，对引力势的修正通常足够小，足以与局部引力约束相兼容。
In second-order scalar-tensor theories we study how the Vainshtein mechanism works in a spherically symmetric background with a matter source. In the presence of the field coupling $F(\phi)=e^{-2Q\phi}$ with the Ricci scalar $R$ we generally derive the Vainshtein radius within which the General Relativistic behavior is recovered even for the coupling $Q$ of the order of unity. Our analysis covers the models such as the extended Galileon and Brans-Dicke theories with a dilatonic field self-interaction. We show that, if these models are responsible for the cosmic acceleration today, the corrections to gravitational potentials are generally small enough to be compatible with local gravity constraints.