Inflationary models, especially those with plateau-type potentials, are consistent with the cosmological data, but inflation itself does not resolve the initial singularity. This singularity is resolved, for example, by the idea of the quantum creation of the Universe from nothing such as the tunneling and no-boundary proposals. The simplest one predicts a closed Universe. Motivated by these facts, we investigate the classical dynamics of a closed universe with a plateau-type potential. Depending on the initial inflaton field value, the universe can undergo a variety of events: an immediate big crunch, a bounce or cyclic phase, and inflation. Although the noninflationary solutions may appear irrelevant to our Universe, they can be turned into single or multiple bounces followed by inflation, taking into account the interactions necessary for the reheating of the Universe after inflation. Thus, the dissipative mechanism in our setup explains both the graceful entry to and exit from inflation and gives us an indirect observational handle on the Universe just after creation. We also comment on the implications of these solutions for probabilistic interpretations of the wave function of the Universe.

中文翻译：

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准循环宇宙中膨胀的耗散出现

暴胀模型，特别是具有平台型势的模型，与宇宙学数据一致，但暴胀本身并不能解决初始奇点。例如，这种奇点可以通过从无到有的量子创造宇宙的想法（例如隧道效应和无边界提议）来解决。最简单的预测是一个封闭的宇宙。受这些事实的启发，我们研究了具有高原型势的封闭宇宙的经典动力学。根据初始暴胀场值，宇宙可能会经历各种事件：立即发生大挤压、反弹或循环阶段以及暴胀。尽管非暴胀解决方案可能看起来与我们的宇宙无关，但考虑到暴胀后宇宙重新加热所需的相互作用，它们可以转化为暴胀后的单次或多次反弹。因此，我们设置中的耗散机制解释了暴胀的优雅进入和退出，并为我们提供了对宇宙诞生后的间接观察。我们还评论了这些解决方案对宇宙波函数概率解释的影响。