R_h=ct宇宙热力学：宇宙熵的简化
Thermodynamics of the R_h=ct Universe: A Simplification of Cosmic Entropy
摘要：
在宇宙学的标准模型中，宇宙以极低的熵开始膨胀，然后急剧增长到大得多的值，与大爆炸后大约38万年的物理条件相一致。除了通过广义热力学第二定律（GSL）之外，似乎没有一个可行的解释这种“非自然”的历史，在GSL中，体熵S_bulk与表观（或引力）视界熵S_h结合在一起。然而，这也不是完全令人满意的，因为这种方法似乎需要在体温度和视界温度之间有一个无法解释的平衡。在本文中，我们探讨了另一种宇宙学的热力学称为R_h=ct宇宙，迄今已非常成功地解决了许多其他问题或不一致的LCDM。我们发现，在这个模型中，S_bulk是常数，简单而优雅地消除了所谓的初始熵问题。然而，考虑到该模型中S_h ~ t^2，GSL可能仍然是相关的，主要是在选择时间箭头方面。
英文摘要：
In the standard model of cosmology, the Universe began its expansion with an anomalously low entropy, which then grew dramatically to much larger values consistent with the physical conditions at decoupling, roughly 380,000 years after the Big Bang. There does not appear to be a viable explanation for this `unnatural' history, other than via the generalized second law of thermodynamics (GSL), in which the entropy of the bulk, S_bulk, is combined with the entropy of the apparent (or gravitational) horizon, S_h. This is not completely satisfactory either, however, since this approach seems to require an inexplicable equilibrium between the bulk and horizon temperatures. In this paper, we explore the thermodynamics of an alternative cosmology known as the R_h=ct universe, which has thus far been highly successful in resolving many other problems or inconsistencies in LCDM. We find that S_bulk is constant in this model, eliminating the so-called initial entropy problem simply and elegantly. The GSL may still be relevant, however, principally in selecting the arrow of time, given that S_h ~ t^2 in this model.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
