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arXiv 1111.5090gr-qcastro-ph.COhep-phhep-th
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二阶标量张量理论中的Vainshtein机制

Vainshtein mechanism in second-order scalar-tensor theories

Antonio De Felice, Ryotaro Kase, Shinji Tsujikawa

摘要:

在二阶标量张量理论中,我们研究了Vainshtein机制如何在具有物质源的球对称背景中工作。在存在场耦合$F(ϕ)=e^{-2Qϕ}$和Ricci标量$R$的情况下,我们通常导出范施泰因半径,在该半径内,即使对于单位阶的耦合$Q$,广义相对论行为也能恢复。我们的分析涵盖了模型,如扩展的Galileon和Brans-Dicke理论与电子场自相互作用。我们表明,如果这些模型是负责今天的宇宙加速,引力势的修正一般是足够小,以兼容当地的重力约束。

英文摘要:

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 $F(ϕ)=e^{-2Qϕ}$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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