Entropic Principles
天体物理学
2009-10-31 v1 广义相对论与量子宇宙学
高能物理 - 理论
摘要
We discuss the evolution of radiation and Bekenstein-Hawking entropies in expanding isotropic universes. We establish a general relation which shows why it is inevitable that there is currently a huge difference in the numerical values of these two entropies. Some anthropic constraints on their values are given and other aspects of the cosmological 'entropy gap' problem are discussed. The coincidence of the classical and quantum entropies for black holes with Hawking lifetime equal to the age of the universe, and hence of radius equal to the proton size, is shown to be identical to the condition that we observe the universe at the main-sequence lifetime.
引用
@article{arxiv.astro-ph/9903225,
title = {Entropic Principles},
author = {John D. Barrow},
journal= {arXiv preprint arXiv:astro-ph/9903225},
year = {2009}
}
备注
latex file 10 pages, style files included