渐近安全范式下的平移对称Horndeski引力
Shift-symmetric Horndeski gravity in the asymptotic-safety paradigm
摘要：
Horndeski引力是动力学暗能量现象学模型的热门竞争者，因此受到观测约束。在这项工作中，我们问Horndeski引力是否可以不仅仅是一个唯象模型，而是成为一个基本理论，它延伸到高能量尺度，包括量子效应。我们发现，在渐近安全的范式，紫外线完成一类简单的模型Horndeski重力是可以实现的，但强烈的约束耦合的理论。这些限制与动态暗能量并不相容。此外，我们发现一个类似的结果，在有效场论的方法，这类模型的Horndeski引力：假设没有新的强耦合物理低于普朗克尺度下，量子引力波动迫使Horndeski耦合太小，实现动力学暗能量的解释。
英文摘要：
Horndeski gravity is a popular contender for a phenomenological model of dynamical dark energy, and as such subject to observational constraints. In this work, we ask whether Horndeski gravity can be more than a phenomenological model and instead become a fundamental theory, which extends towards high energy scales and includes quantum effects. We find that within the asymptotic-safety paradigm, an ultraviolet completion of a simple class of models of Horndeski gravity is achievable, but places strong constraints on the couplings of the theory. These constraints are not compatible with dynamical dark energy. Further, we find a similar result in an effective-field theory approach to this class of models of Horndeski gravity: under the assumption that there is no new strongly-coupled physics below the Planck scale, quantum gravity fluctuations force the Horndeski couplings to be too small to achieve an explanation of dynamical dark energy.
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