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arXiv 0901.1314hep-thastro-ph.COgr-qc
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协变伽利略

Covariant Galileon

C. Deffayet, G. Esposito-Farese, A. Vikman

摘要:

我们考虑最近引入的“伽利略”场在动态时空。当伽利略被假定为最低限度地耦合到度量,我们强调,这两个领域的伽利略方程和度量涉及到三阶导数。我们表明,一个独特的非最小耦合的伽利略曲率消除了所有的场方程中的所有高导数,从而产生二阶方程,没有任何额外的传播自由度。由此产生的理论打破了原模型的广义“伽利略”不变性。

英文摘要:

We consider the recently introduced "galileon" field in a dynamical spacetime. When the galileon is assumed to be minimally coupled to the metric, we underline that both field equations of the galileon and the metric involve up to third-order derivatives. We show that a unique nonminimal coupling of the galileon to curvature eliminates all higher derivatives in all field equations, hence yielding second-order equations, without any extra propagating degree of freedom. The resulting theory breaks the generalized "Galilean" invariance of the original model.

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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