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31.
We extend Parikh's study to the non-stationary black hole. As an example of the non-stationary black hole, we investigate the tunnelling effect and Hawking radiation from a Vaidya black hole whose Bondi mass is identical to its mass parameter. The Hawking radiation is considered as a tunnelling process across the event horizon and we calculate the tunnelling probability. It is found that the is the function of Bondi mass re(υ). result is different from Parikh's study because dr H/dυ 相似文献
32.
Gravity/fluid correspondence acts as an important tool in investigating the strongly correlated fluids.We carefully investigate the holographic fluids at the finite cutoff surface by considering different boundary conditions in the scenario of gravity/fluid correspondence. We find that the sonic velocity of the boundary fluids at the finite cutoff surface is critical in clarifying the superficial similarity between the bulk viscosity and perturbation of the pressure for the holographic fluid, where we set a special boundary condition at the finite cutoff surface to explicitly express this superficial similarity. Moreover, we further take the sonic velocity into account to investigate a case with a more general boundary condition. In this more genaral case, although two parameters in the first order stress tensor of holographic fluid cannot be fixed, one can still extract the information about the transport coefficients by considering the sonic velocity seriously. 相似文献
33.
34.
Drawbacks of the ingoing Eddington-Finkelstein coordinates in describing the quantum thermal properties of the evaporating Vaidya black hole are presented. A new coordinate system we proposed previously [Acta Phys. Sin. 46 (1997) 1273] is employed. In this new coordinate system, the thermal radiation temperature of the Vaidya black hole is discussed again with the back reaction method. 相似文献
35.
Theoretical study on controlling nonlinear behaviors of a coupled-cavity VCSEL by external optical injection 总被引:6,自引:0,他引:6
A master-slave configuration used to control the nonlinear behaviors arising in a vertical cavity surface emitting laser (VCSEL) with strong external optical feedback is established. In terms of bifurcation diagram, time and frequency domain, the influence of the continuous optical injection from the master VCSEL on the nonlinear characteristics of the slave is investigated theoretically. For relatively weak injection, the slave still keeps its intrinsic nonlinear state. With increasing the injection strength, these nonlinear behaviors evolve to periodic fluctuation, and at last are replaced by the steady-state (e.g. the critical injection parameter for steady-state is 1.2 when external cavity's reflectivity and length are 4% and 4 cm, respectively). During this evolution the bifurcation-contraction phenomena are also observed. 相似文献
36.
1太阳、地球与月球 我们的太阳系由太阳、8颗行星及其卫星、小行星、彗星以及大量尘埃、气体、等离子体、辐射粒子和电磁场构成,直径几乎达到11.y.(1.y.为光年,光走过一年的距离)[1-6]. 相似文献
37.
The stability of the Schwarzschild black hole is restudied in the Painlevé
coordinates. Using the Painlevé time coordinate to define the initial time, we
reconsider the odd perturbation and find that the Schwarzschild black hole in the
Painlevé coordinates is unstable. The Painlevé metric in this paper
corresponds to the white-hole-connected region of the Schwarzschild black hole
(r>2m) and the odd perturbation may be regarded as the angular perturbation.
Therefore, the white-hole-connected region of the Schwarzschild black hole is
unstable with respect to the rotating perturbation. 相似文献
38.
In this paper, we study the Hawking radiation via tunnelling from a uniformly
accelerating black hole. Although the Bekenstein--Hawking entropy is proportional
also to the area of the event horizon, the radius of it, r_{\rm H}, is a function
of \theta, which leads to the difficulties in the calculation of the emission
rate. In order to overcome the mathematical difficulties, we propose a new technique
to calculate the emission rate and the result obtained is reasonable. 相似文献
39.
正梁灿彬教授与曹周键博士合著的《从零学相对论》一书已由高等教育出版社于2013年10月出版.梁灿彬教授是我国著名的相对论专家,做过许多高水平的科研工作.他同时又是一位杰出的教育家,在电磁学以及微分几何和相对论的教学中做出了突出成 相似文献
40.
介绍了刘辽教授个人和学术生涯的主要阶段.他曾经致力于广义相对论的理论研究,并且为这一伟大理论在中国的引进和广泛传播做出过重大贡献.刘辽教授培养了大批研究广义相对论的学生,出版了不少关于广义相对论及其子领域的书籍,发表了许多这方面的研究论文,内容涉及弯曲时空、黑洞、宇宙学、虫洞、时间机器、引力波等. 相似文献