标题： 关于“过去强引力”宇宙学中的强耦合问题 显示英文标题

标题： On the strong coupling problem in cosmologies with "strong gravity in the past"

摘要： 我们检查在具有“过去强引力”（Jordan框架）的反弹宇宙模型中早期时间的潜在强耦合问题，该模型与暴胀（Einstein框架）共形相关。 从Jordan框架中的朴素维度分析来看，会得出量子强耦合能标可能低于经典能标的结论。 然而，从Einstein框架的观点来看，这种情况不应该发生。 我们通过在Jordan框架中的计算来说明这一点，结果表明树图振幅中的危险贡献发生了抵消。 显示英文摘要

摘要： We examine the potential strong coupling problem at early times in a bouncing cosmological model with "strong gravity in the past" (Jordan frame), which is conformally related to inflation (Einstein frame). From naive dimensional analysis in the Jordan frame one would conclude that the quantum strong coupling energy scale can be lower than the classical energy scale. However, from the Einstein frame prospective this should not be the case. We illustrate this point by calculation in the Jordan frame which shows cancellations of the dangerous contributions in the tree level amplitude.