膨胀宇宙中孤立气团的运动

本文讨论了膨胀宇宙中孤立气团的运动.发现,除了静态孤立气团的收缩条件(分层统计均匀和初始半径大于临界值D^－1_r)之外,膨胀情形下收缩条件还要包括,哈勃常量H小于某个常量D_t.     

孤立纯光子系统与背景辐射

从能量角度论述了孤立纯光子系统是不稳定的. 它与观测到的宇宙微波背景辐射的光子平衡态是截然不同的. 所以, 正在膨胀着的宇宙不会来自一团“纯能量”. The unstability of any isolated pure photon system is indicated from the angle of energy. The nature of this system is completely different from the one of an equilibrium state of photons, which is just the cosmic microwave background radiation observed. Therefore, our expanding universe can not come from a group of pure energy.     

宇宙质心参考系

根据实际天文观测论述了膨胀着的宇宙系统的时间可以与空间分开来讨论;宇宙的空间是平直的。在宇宙质心坐标系中,由背景辐射温度、宇宙密度和宇宙半径（最远星系的距离）3个观测数据计算了宇宙这个引力系统的总能量,结果表明系统是一个引力束缚态,将来会收缩。在均匀分布的初始条件下计算了收缩过程,这是同步自由落体过程。在宇宙的膨胀过程与其收缩过程对称的假设之下,建立膨胀时间与背景辐射温度的一对一的对应关系。According to astronomical observation we point out that the time of our expanding cosmic system can be discussed separating from the space. And the space in our universe is flat. In the cosmic center-of-mass frame（CCF）, based on the temperature of CMBR, the cosmic density and the cosmic radii, the distance of the farmost galaxy, the total energy of our universe asa gravitation system has been calculated. It shows that our universe is in a gravitational bound state, and it will contract. In CCF the contracting progress is a synchronized freely falling body under initial condition of uniform distribution. Uder assumption of the symmetry of cosmic expanding and contracting progresses, th one-to-one correspondence of the expanding time to the temperature of CMBR can be obtained.     

背景辐射与光子平衡态

背景辐射与光子平衡态张邦固（科学出版社北京１００７１７）ＢａｃｋｇｒｏｕｎｄＲａｄｉａｔｉｏｎａｎｄＰｈｏｔｏｎＥｑｕｉｌｉｂｒｉｕｍＳｔａｔｅＺｈａｎｇＢａｎｇｇｕ（ＳｃｉｅｎｃｅＰｒｅｓ,Ｂｅｉｊｉｎｇ１００７１７）ＡｂｓｔｒａｃｔＴｈｅＢａｃ...