标题： 绝热扰动的后膨胀行为与张量-标量比 显示英文标题

标题： Post-inflationary behavior of adiabatic perturbations and tensor-to-scalar ratio

摘要： 我们解释了为什么在宇宙膨胀后的演化过程中，增大宇宙张量扰动与标量扰动之比是如此困难，甚至可能是不可能的。然而，与一些近期的主张相反，在最简单的通胀模型中，张量扰动可以相对较大，且这些模型并未违反现代量子场论的任何规则。 显示英文摘要

摘要： We explain why it is so difficult and perhaps even impossible to increase the cosmological tensor-to-scalar perturbation ratio during the post-inflationary evolution of the universe. Nevertheless, contrary to some recent claims, tensor perturbations can be relatively large in the simplest inflationary models which do not violate any rules of modern quantum field theory.