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    黑洞
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      black hole
        THE NONTHERMAL RADIATIONS NEAR THE HORIZON IN KERR-NEWMAN-DE SITTER BLACK HOLE
        Kerr-Newman-de Sitter黑洞的非热辐射
    短句来源
        Temperature Distribution of the Accretion Disc Around a Black Hole
        黑洞吸积盘的温度分布
    短句来源
        HAWKING RADIATION FROM A STATIC BLACK HOLE POSSESSING MASS-QUADRUPOLE MOMENT
        带有质量四极矩的静态黑洞的Hawking辐射
    短句来源
        Galactic Rotation and the Criterion for Black Hole Formation
        星系的转动与黑洞形成的判据
    短句来源
        Evolution of Black Hole Accretion Disks and Thermal Instability of Temperature Distribution
        黑洞吸积盘的演化及温度分布的热不稳定性
    短句来源
    更多       
      black holes
        The Hawking Radiation of Black Holes——Quantum Effect of Matter in the Gravitation Field
        黑洞的Hawking辐射——引力场中物质的量子效应
    短句来源
        THERMAL EFFECT OF NON-STATIC BLACK HOLES IN 1+1 DIMENSIONS
        1+1维动态黑洞的热效应
    短句来源
        Mass Distribution Around the Black Holes at the Centers of BL Lac Objects
        BL Lac天体中心黑洞周围的物质分布
    短句来源
        Coordinate Transformation for Hawking Effects of Evaporating Black Holes
        动态黑洞Hawking效应中的坐标变换
    短句来源
        The Embedding of Event horizon Surfaces of two Schwarzschild Black Holes
        两个Schwarzschild黑洞视界表面嵌入欧几里得空间
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      “黑洞”译为未确定词的双语例句
        Euclidean Action, Partition Function and Thermodynamics of a Black Hole-Global Monopole
        欧氏作用量、配分函数与黑洞-整体单极热力学
    短句来源
        Study of Temporal Spatial Distribution of the Radiation Temperature in Hohlraum
        黑洞靶内辐射场温度的时空分布实验研究
    短句来源
        The Effect of the Blandford-Znajek Process on the Evolution of Black-Hole Accretion Disks
        Blandford-Znajek过程对黑洞吸积盘演化的影响
    短句来源
        QUANTUM EFFECT OF 1+1 DIMENSION DYNAMIC CHARGED BLACK-HOLE
        1+1维动态带电黑洞的量子效应
    短句来源
        Evolution of the Inner Radius of Black-Hole Accretion Disk and the Blandford-Znajek Process
        黑洞吸积盘内边缘半径的演化与Blandford-Znajek过程
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      black hole
    Finally I point out the similarities and common physics in Galactic black hole X-ray binaries and active galactic nuclei, and demonstrate that the black hole mass estimation is very much helpful to understand the accretion physics around black holes.
          
    As an example, we consider problems on the motion of charged test particles in an arbitrary electromagnetic field and in the outer Reissner-Nordstrem space-time in the field of a charged black hole and some external electromagnetic field.
          
    The maser emission originates at distances of 0.15-0.29 pc from the center in a thin, cold accretion disk (gas-dust torus) rotating around a supermassive black hole of mass 4 × 107M⊙.
          
    A stochastic model for correlations between central black hole masses and galactic bulge velocity dispersions
          
    We show that the recently discovered correlations between central black hole masses and galactic bulge parameters naturally arise in this scenario.
          
    更多          
      black holes
    The determination of the mass of black holes in our universe is crucial to understand their physics nature but is a great challenge to scientists.
          
    In this paper I briefly review some methods that are currently used to estimate the mass of black holes, especially those in X-ray binary systems and in galactic nuclei.
          
    Our recent progress in improving the mass estimates of supermassive black holes in active galactic nuclei by involving some empirical relations is presented.
          
    Finally I point out the similarities and common physics in Galactic black hole X-ray binaries and active galactic nuclei, and demonstrate that the black hole mass estimation is very much helpful to understand the accretion physics around black holes.
          
    The World in Dark Tones: Dark Matter, Dark Energy, and Black Holes
          
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    The emission mechanism from X-ray soturces in close binary stars is studied.It is suggested that pair production may play an important role in the X-ray emission region which is formed by the accretion of a compact object(a neutron star or a black hole).The present model accounts qualitatively for the following observed general properties in X-ray binaries: 1.The X-ray luminosity lies within the range 10~(36)—10~(38)erg/sec. 2.The X-ray energy spectrum can in the majority of cases be represented either the power-law...

    The emission mechanism from X-ray soturces in close binary stars is studied.It is suggested that pair production may play an important role in the X-ray emission region which is formed by the accretion of a compact object(a neutron star or a black hole).The present model accounts qualitatively for the following observed general properties in X-ray binaries: 1.The X-ray luminosity lies within the range 10~(36)—10~(38)erg/sec. 2.The X-ray energy spectrum can in the majority of cases be represented either the power-law or the thermal bremsstrahlung form. 3.The temperature of the thermal bremsstrahlung spectrum is the order of 10~8K. 4.The form of the energy spectrum does not change appreciably when the luminosity fluctuates.

    本文研究了密近双星中的 X 射线源的发射机制.本文提出:在致密星(中子星或黑洞)的吸积所形成的 X 射线发射区中,电子对的产生起着重要的作用.这种模型可以定性地说明 X射线双星所具有的几个一般的观测特征,即:1.它们的 X 射线光度都在10~(36)—10~(38)尔格/秒范围中.2.X 射线能谱为幂形式,或热韧致形式.3.热韧致谱的温度数量级为10~K.4.当光度涨落时,能谱形式无明显变化.

    In this paper, we shall show that a star model, which is black hole-free and singu-larity-free, can be obtained naturally in the gravitational guage theory, provided the space- time is torsion-free and the matter is spinless. Our conclusions in a sense show that he discussions about the black hole and the singularity based on the general relativity may not describe the nature correctly.

    本文得出,在时空无挠率、物质无自旋的条件下,从重力规范理论出发,可以建立某种既非黑洞又无奇性的星体模型。这样,本文就在一定意义上表明,以广义相对论为基础对黑洞和奇性的讨论,很可能并不符合自然界的真实情况。

    Eecently, Liu and Xu studied the Hawking evaporation of the Dirac particles out of the quasi-extreme Kerr black holes on the foundation of the S. Chandrasekhar 's work. In this paper, Liu and Xu's work is firstly extended to the quasi-extreme Kerr-Newman black holes, and then to general Kerr-Newman black holes. The Hawking thermal spectrum for fermions for general Kerr-Newman black holes is obtained.The Dirac equation in the spinor form of the charged particles in the Kerr-Newman spacetime was given by Page:...

    Eecently, Liu and Xu studied the Hawking evaporation of the Dirac particles out of the quasi-extreme Kerr black holes on the foundation of the S. Chandrasekhar 's work. In this paper, Liu and Xu's work is firstly extended to the quasi-extreme Kerr-Newman black holes, and then to general Kerr-Newman black holes. The Hawking thermal spectrum for fermions for general Kerr-Newman black holes is obtained.The Dirac equation in the spinor form of the charged particles in the Kerr-Newman spacetime was given by Page: (in this paper G= h =C=I)By means of null-tetrad and dyad, we have obtained the uncoupled Dirac equations, thatIntroducing '' Tortoise coordinates transformation''near the horizons, we haveFor the quasi-extreme Kerr-Newman black holes, we obtainwhereK = (r2 + a2)ω- am- eQr. The solutions of Eq. (6) arewith Just outside the horizon, we have the outgoing waves withNow, we would exter of it. We can only e complex plane. We the radius |r-r+|. SThe outgoing waves inside and outside the horizon can be written together as whereOutside the horizon, Eq. (9) represents an outgoing positive-energy flux of particles coming from the horizon. But inside the horizon, Eq. (9) describes a positive-energy flux of particles traveling backward in time out of the singularity. In other words, it describes a negative-energy flux of antiparticles traveling forward in time for the singularity. It means that particle-antiparticle pairs are created near the horizon.Apparently, from the normalization condition, we can obtain thatorwithwhere T is the temperature of the black hole, k is the Boltzmann constant, and k is the gravitational acceleration of the horizon. Eq. (10) is the Hawking thermal spectrum formula about Dirac particles for the quasi-extreme Kerr-Newman black holes.On the other hand, the outgoing waves solutions of the Dirac equation for the quasi-extreme Kerr-Newman black holes are also the outgoing waves solutions of the Klein-Gordon equation for general Kerr-Newman black holes. And we find these outgoing waves solutions satisfy the Dirac equation (5) for general Kerr-Newman black holes too. So, we can obtain the same Hawking thermal spectrum for fermions from the Dirac equation as from the Klein-Gordon equation for all of the Kerr-Newman black holes.

    本文得到了Kerr-Newman黑洞视界附近Dirac方程的解,并与Klein-Gordon方程的解作了比较。把刘辽、许殿彦的工作首先从准极端Kerr黑洞推广到准极端Kerr-Newman黑洞,然后又进一步推广到一般Kerr-Newman黑洞,从而证实了一般Kerr-Newman黑洞辐射的Dirac粒子的能谱具有黑体辐射的形式。

     
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