It is of interest to understand whether or not one can construct a classical field theory description of early cosmology which would be free of initial singularity and stable throughout the whole evolution. One of the known possibilities is genesis within the Horndeski theory, which is thought to be an alternative to or a possible completion of the inflationary scenario. In this model, the strong coupling energy scale tends to zero in the asymptotic past, t→-∞, making the model potentially intractable. We point out that despite the latter property, the classical setup may be trustworthy since the energy scale of the classical evolution (the inverse of its timescale) also vanishes as t→-∞. In the framework of a concrete model belonging to the Horndeski class, we show that the strong coupling energy scale of the cubic interactions vastly exceeds the classical energy scale in a certain range of parameters, indicating that the classical description is possible.

中文翻译：

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避免 Horndeski 成因中的强耦合问题

理解人们是否可以构建一个早期宇宙学的经典场论描述是很有趣的，它在整个演化过程中没有初始奇点并且是稳定的。已知的可能性之一是 Horndeski 理论中的起源，它被认为是通货膨胀情景的替代方案或可能的完成。在这个模型中，强耦合能量尺度在渐近过去趋于零，t→-∞，使模型潜在地难以处理。我们指出，尽管有后一种特性，经典设置可能是值得信赖的，因为经典演化的能量标度（其时间标度的倒数）也随着 t→-∞ 而消失。在属于 Horndeski 类的具体模型的框架中，