Horndeski背后：结构稳健的高阶导数EFT
Behind Horndeski: Structurally Robust Higher Derivative EFTs
摘要：
高阶导数标量相互作用可以产生有趣的宇宙学场景。我们对此类算子进行了完整的分类，这些算子可以在不引入鬼波的情况下产生相当大的效应，同时定义了在包含量子修正的情况下稳健的有效场论。一组规则的权力计数一致的系数所产生的拉格朗日提供了一个近似的全球对称性的存在。我们以这种方式推导出的相互作用包含了所谓的Horndeski理论和超越Horndeski理论的一个子集。因此，我们的建设提供了一个结构强大的背景下，研究他们的现象学。应用暗能量/修改重力和测地线完整的宇宙学进行了简要讨论。
英文摘要：
Higher derivative scalar interactions can give rise to interesting cosmological scenarios. We present a complete classification of such operators that can yield sizeable effects without introducing ghosts and, at the same time, define an effective field theory robust under the inclusion of quantum corrections. A set of rules to power count consistently the coefficients of the resulting Lagrangian is provided by the presence of an approximate global symmetry. The interactions that we derive in this way contain a subset of the so-called Horndeski and beyond Horndeski theories. Our construction therefore provides a structurally robust context to study their phenomenology. Applications to dark energy/modified gravity and geodesically complete cosmologies are briefly discussed.
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