Toy Model for Eternal Expanding Universe Driven by Quintessence

Recent observations of microwave background and type Ia supernovae (SNe Ia) suggest a space-fiat and accelerated expansion Universe. On the other hand, observations of supernovae 1997ff reveal that the Universe has undergone a decelerating-acceleratingprocess. Combining these two classes of observations, wepresent an eternal expanding Universe toy model driven by quintessence. In this picture, the Universe undergoes an endless sequence of accelerating-decelerating cycles.     

Brans-Dick宇宙中的轻子数生成

讨论了\,Brans-Dicke\,理论中的辅助性标量,\phi,在宇宙的重子数不对称起源中所扮演的可能角色.在,Morganstern,关于,Brans-Dicke(BD)宇宙学的一系列工作的基础上, 讨论了这个引力性标量场的导数和重子流, J^μB ,或者重子--轻子'流, J^μB-L ,的耦合效应. 发现由这个耦合形成的自发重子数生成机制, 只要其中大统一发生的时标足够提前, 就可以产生足够的重子数不对称,n_B/s～10^-10. 此外,也研究了由,Davoudiasl,引进的里奇标量,R,的导数和重子流之间的相互作用耦合在辐射为主的,BD,宇宙中的重子数生成效应. 结果表明, 在此情况下因为,R,不再为零也同样可以获得重子数的不对称, 从而不同于爱因斯坦宇宙框架下的相关结论.     

THE HAWKING RADIATION OF THE DIRAC PARTICLE IN FOUR-DIMENSIONAL STEADY STATE OF PSEUDO-RIEMANN SPACE-TIME

In this paper, the Hawking radiation of the Dirac particle at the future horizon is studied in a series of the 4-dimensional steady state pseudo-Riemann space-lime. The Dirac equation is directed by the n,ill-tetred method. The explicit expression of the 4-component wave function of the Dirac particle is obtained near the horizon. The thermal spectrs formula of the Hawking radiation of the Dirac particle is solved by the analytic continuation method. We discovered that the radiative temperature is directly proportional to the gravity at the horizon.     

从宇宙波函数看两类宇宙和Wormholes

本文根据所求得的具有共形标量场的Vilenkin宇宙波函数,发现存在有两种不同类型的宇宙.这两种宇宙可以通过量子隧道效应连接起来,从一个区域过渡到另一个区域.     

Quantum teleportation and Kerr-Newman spacetime

We consider the teleportation in the background of Kerr-Newman spacetime. Because of the Hawking effect, the fidelity of the teleportation is reduced. The results also show the fidelity is closely related to the mass, charge and rotating velocity of the black hole: high fidelity can be reached for massive, slowly rotating Kerr-Newman black holes.     

Quantum Information Measurements for Garfinkle-Horne Dilaton Black Holes

The quantum non-cloning theorem is discussed for Garfinkle-Horne dilaton black holes. It is found that if the black hole complementarity principle is correct, then it will be questioned whether the quantum non-cloning theorem is well established inside the inner horizon. It is also found that another complementarity principle may be needed inside the inner horizon of the Garfinkle-Horne dilaton black hole.     

高维时空中静态荷电球体的一个严格内解

高维时空中Schwarzschild度规和Reissner-Nordstr?m度规的系数g₀₀与g₁₁都满足关系式g₀₀g₁₁=-1。本文考虑这个度规系数的关系式在荷电球体内部成立,而且假设电荷密度σ=σ₀r^be^-λ(r)/2的情况下,给出高维球对称时空中静态荷电的一个精确内解。     

Kerr-Newman-Kasuya背景时空中的波动方程

§1 弯曲时空中的波动方程的退耦与分离变量问题是弯曲时空量子理论中的一个十分重要而又困难的问题,近十多年来这方面研究有了较大进展。 1968年Carter导出了Kerr背景时空中的Klein-Goldon方程的退耦与分离变量的量子方程。 1969年Kinnersley在研究D型时空分类时引入了一套零标架理论。     

具有标量-旋量相互作用场的量子宇宙学

本文利用Hartle和Hawking的方法,讨论了具有标量-旋量相互作用的σ模型的量子宇宙学,得到了相应的Wheeler-DeWitt方程,求出了它们的宇宙波函数。由波函数的渐近解可以看出,当标度因子α很小时,σ模型中旋量部分的影响很显著,具体的形式与初始条件有关,而当标度因子α很大时,σ模型中旋量部分的影响并不显著,其行为和标量部分一样。     

Kerr-Newman-De Sitter时空中的Dirac方程的退耦和分离变量

本文给出了Kerr-Newman-De Sitter时空中的Dirac方程的退耦和分离变量,并在Kerr-Newman-De Sitter时空的视界附近通过适当的变换找到了静止质量不为零的Dirac方程的有物理意义的解,导出了Hawking热谱公式,从而解决了Dirac粒子在Kerr-Newman-De Sitter黑洞背景下的Hawking蒸发问题。 关键词：