论文标题
探索Horndeski Genesis中的强耦合问题
Toward evading the strong coupling problem in Horndeski genesis
论文作者
论文摘要
了解是否可以构建对早期宇宙学的经典田地理论描述，该描述在整个演变中都没有最初的奇异性和稳定。已知的可能性之一是霍恩德斯基理论中的起源，这被认为是通货膨胀情景的替代或可能完成的。在此模型中，强耦合能量表在渐近过去的$ t \ to -\ infty $中趋于零，从而使该模型具有潜在的棘手。我们指出，尽管有后一种属性，但经典设置可能会值得信赖，因为经典演化的能量量表（其时间尺度的倒数）也随着$ t \ to -\ infty $而消失。在属于Horndeski类的混凝土模型的框架中，我们表明，立方相互作用的强耦合能尺度大大超过了一定范围的参数，表明经典描述是可能的。
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 the 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, $t \to - \infty$, 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 $t \to -\infty$. 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.
