宇宙光子熵  

Entropy of Photons in Cosmos

作　　者：张邦固[1] 

机构地区：[1]北京科学出版社

出　　处：《湖南师范大学自然科学学报》1998年第4期46-50,共5页Journal of Natural Science of Hunan Normal University

摘　　要：在平直空间的前提下，计算了背景辐射这一光子准平衡态的熵．进而，在讨论宇宙膨胀这种整体运动时，在均匀分布的前提下，整个宇宙亦是一准平衡态．宇宙光子总数约为宇宙重子总数一亿倍以上的观测事实说明，宇宙的熵基本上等于光子熵．把计算了宇宙总能量与熵联立消去共同的变数温度Ｔ，便得到了只依赖于宇宙半径的总熵公式（当然，它亦与宇宙总能量有关）．它表明，光子熵，也就是宇宙总熵将随着宇宙的膨胀而单调地减少．这一结果与我们以前的工作是一致的．A formula of entropy of background radiation,a photon guasi equilibrium state,has been obtained in a flat space.When a global motion,liking expansion of the cosmos is discussed,the cosmos is considered as an uniform and a quasi equilibrium state.Tolal number of photons is more than 10 8 of total number of baryon.This fact of astronomical observation shows that the entropy of photons is the entropy of the cosmos.Eliminating the temperature T,common variation,in formulas of the total energy and entropy of the cosmos,we have got a formula of entropy of the cosmos,which only dependents radius of the cosmos.It shows that the tatal entropy of the cosmos is decreasing monotonously with the expansion of the cosmos.This result is consistent with our past works.It shows that the principle of entropy increase found for the macrosystems on the surface of earth does not stand for some cosmosystems with the radias biger than 10 light years.

关 键 词：背景辐射 光子平衡态 宇宙光子熵 宇宙膨胀 

分 类 号：P159[天文地球—天文学]