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arXiv 1306.1835gr-qcastro-ph.COhep-th
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带辅助场的重力

Gravity with Auxiliary Fields

Paolo Pani, Thomas P. Sotiriou, Daniele Vernieri

摘要:

对广义相对论的修正通常包括额外的动力学自由度,这一点迄今尚未被发现。在这里,我们探讨的可能性修改爱因斯坦的理论,仅增加非动力学领域。与最低要求,该理论满足弱等价原理,并承认一个协变拉格朗日制定,我们表明,一般的场方程必须包括高阶导数的物质领域。这对这些理论的可行性产生了深远的影响。我们开发了一个参数化的基础上衍生的扩展,并表明-下一个领导秩序-所有的理论描述只有两个参数。我们的方法可以用来把严格的,理论独立的约束,这样的理论,我们证明使用牛顿极限作为一个例子。

英文摘要:

Modifications of General Relativity usually include extra dynamical degrees of freedom, which to date remain undetected. Here we explore the possibility of modifying Einstein's theory by adding solely nondynamical fields. With the minimal requirement that the theory satisfies the weak equivalence principle and admits a covariant Lagrangian formulation, we show that the field equations generically have to include higher-order derivatives of the matter fields. This has profound consequences for the viability of these theories. We develop a parametrization based on a derivative expansion and show that - to next to leading order - all theories are described by just two parameters. Our approach can be used to put stringent, theory-independent constraints on such theories, as we demonstrates using the Newtonian limit as an example.

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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