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arXiv 0711.0193gr-qc
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引力熵的上下限

Upper and Lower Bounds on Gravitational Entropy

Paul H. Frampton, Thomas W. Kephart

摘要:

宇宙内部的熵有许多贡献,包括来自辐射和残余中微子的众所周知的贡献。引力熵更大,也更微妙。提供我们下限的一个贡献来自星系中心的超大质量黑洞。剩下的就更难确定了。我们建议一个上界,这是许多数量级以下的全息约束,但以上的超大质量黑洞。我们提出,引力熵的暗物质晕是最大的贡献者,目前的宇宙熵。

英文摘要:

The entropy in the interior of the Universe has many contributions including well understood ones from radiation and relic neutrinos. The gravitational entropy is larger and more subtle. One contribution which provides our lower bound is from supermassive black holes at the centers of galaxies. The remainder is harder to pin down. We suggest an upper bound which is many orders of magnitude below the holographic bound yet above that of the supermassive black holes. We propose that gravitational entropy in dark matter halos is the largest contributor to the present entropy of the universe.

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。

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