因果熵原理对宇宙环境条件的预测
Predictions of the causal entropic principle for environmental conditions of the universe
摘要：
因果熵原理被认为是理解宇宙学常数大小的人择原理的一个更好的选择。在这种方法中，假设创建观察者的概率与最大因果连通区域（因果菱形）中的熵产生ΔS成正比。我们改进了原来的治疗，更好地量化由于恒星的熵产生，使用分析模型的恒星形成的历史，准确地占宇宙学参数的变化。我们计算了ΔS对密度差Q=δρ/ρ的依赖关系，发现我们的宇宙比通常的人择方法更接近Q的最可能值，并且概率对这个振幅的依赖性相对较弱。此外，我们首次估计了ΔS对重子分数和总物质丰度的依赖性。最后，我们还探讨了暗物质衰变的可能性，各种观测到的伽马射线过剩，可能会产生相当数量的熵恒星。
英文摘要：
The causal entropic principle has been proposed as a superior alternative to the anthropic principle for understanding the magnitude of the cosmological constant. In this approach, the probability to create observers is assumed to be proportional to the entropy production ΔS in a maximal causally connected region -- the causal diamond. We improve on the original treatment by better quantifying the entropy production due to stars, using an analytic model for the star formation history which accurately accounts for changes in cosmological parameters. We calculate the dependence of ΔS on the density contrast Q=δρ/ρ, and find that our universe is much closer to the most probable value of Q than in the usual anthropic approach and that probabilities are relatively weakly dependent on this amplitude. In addition, we make first estimates of the dependence of ΔS on the baryon fraction and overall matter abundance. Finally, we also explore the possibility that decays of dark matter, suggested by various observed gamma ray excesses, might produce a comparable amount of entropy to stars.
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。
