黑洞

In the core of the larger spiral structure of NGC 1300, the nucleus shows its own extraordinary and distinct "grand-design" spiral structure that is about 3,300 light-years long. Only galaxies with large-scale bars appear to have these grand-design inner disks — a spiral within a spiral. Models suggest that the gas in a bar can be funneled inwards, and then spiral into the center through the grand-design disk, where it can potentially fuel a central black holes. NGC 1300 is not known to have an active nucleus, however, indicating either that there is no black hole, or that it is not accreting matter.

星系演化除了像两个星系相撞那样的剧烈作用之外，还有自己内部很慢的演化，因为一个星系总会有一些引力不稳定，如上图中的NGC1300，它是一个棒旋星系，这种bar结构导致的引力不完全对称会驱使很多气体和尘埃损失角动量往里面落，我们可以清楚的看到dust lanes，有点像黑洞的吸积，但这个星系是个非活动星系，目前还没有黑洞存在的明确证据，but我相信肯定是有的，没有比在星系中心放一个黑洞再完美不过的事情了，或许这些下落的dust lanes是黑洞发光的开始呢。

In chapter 2, the real scalar field equation is solved numerically in Schwarzchild-de Sitter space-time with different angular frequency co.

在论文的第一章，简单地介绍了黑洞的形成、视界的概念、黑洞的热性质以及黑洞辐射和标量场辐射等基础知识。

Based on these properties mentioned above and the standard model of AGNs, we prove that the nature of the systematical difference between Mσ and MH is that Mσ represents the mass in broad emission line region, while MH represents the mass in the continual emission region (r≤ra and ra＜＜rb) which is near the innermost stable orbit around the black hole.

以上述的这些性质和活动星系核标准模型为基础，我们证明了这两种方法所得的黑洞质量Mσ和MH之间的系统差异是因为Mσ描述的是宽发射线区的黑洞质量，而MH描述的是黑洞周围在最内层轨道附近的连续发射区的质量。

By using statistical entropy of the Dirac field of static spherically symmetric black hole , the black hole s radiant emittance is educed and calculated, the conclusion that the radiant emittance of the black hole is in proportionate to the quartic power of the temperature of the black hole s event horizon is drawn.

利用静态球对称黑洞Dirac场的统计熵，导出黑洞的辐出度，得到了黑洞的辐出度与黑洞视界温度的四次方成正比的结论。

Using the statistical entropy of the spinning gravitation field of static spherically symmetric black hole,the radiant emittance of static spherically symmetric black hole is calculated,and we obtain a conclusin that the radiant emittance of black hole is proportionate to quartic power of temperature of the event horizon of the black hole.

利用静态球对称黑洞引力自旋场的统计熵，导出静态球对称黑洞引力自旋场的辐出度，得到了黑洞的辐出度与黑洞视界温度的四次方成正比的结论。

The quasinormal modes and the late-time tails of perturbational fields in the black hole spacetime are related to the identification and stability of the black holes.

然而黑洞物理学中还有许多问题人们尚未弄清楚，像黑洞熵的统计起源、黑洞信息疑难以及黑洞是否稳定等都是黑洞物理中非常重要而有待解决的问题。

Light from stars directly behind the hole is swallowed by the horizon, while light from other stars is merely bent by the black hole's gravity, forming a warped image around the hole.

黑洞之后的恒星所发出的光都被黑洞吞噬，其他恒星的光则由于黑洞的引力弯曲，于是在黑洞周围形成了扭曲的图像。

"The fate of this black hole and others like it is an active area of research," said George Helou, deputy director of NASA's Spitzer Science Center at the California Institute of Technology in Pasadena."Some theories hold that the black hole might quiet down and eventually entera more dormant state like our Milky Way black hole."

美国加利福尼亚州帕萨迪纳市加州理工学院，美国宇航局斯皮策科研中心副主管乔治·赫鲁说：&这个黑洞以及类似黑洞的命运是一个研究热点，某些理论坚信黑洞最终会平静下来并最后像银河中心黑洞一样进入休眠模式。&

It is shown that these evolution characteristics in retrograde accretion are very different from those in the prograde case. The temperature of black holes decreases monotonously in prograde case, while it has a maximum in retrograde case. The entropy of black holes always increases in the whole accretion process, and the rates of change of the entropy in retrograde case are much larger than those in the prograde case.

结果表明，黑洞的温度和熵在逆行吸积与顺行吸积中的演化特征很不相同：在顺行吸积中黑洞的温度单调减小，而在逆行吸积中黑洞的温度存在一个极大值；在吸积的全过程中，黑洞的熵始终是增加的，而且逆行吸积中黑洞熵的变化率要比顺行吸积中的黑洞熵的变化率大得多。

A computer simulation shows the evolution of a molecular cloud with a solar mass of 10^4 falling toward a supermassive black hole with a solar mass of 10^6. Here, the cloud is within 0.5 parsecs of the black hole. Color scale is from 0.1 g cm^-2 to 1000 g cm^-2. A small population of stars is being ejected from the system in the this image.

据美国生活科学网站21日报道，银河系中央潜伏着一个巨大的黑洞，身处黑洞附近的天体都会逐渐地被黑洞吞噬，并最终消失地无影无踪，也就是说在理论上黑洞附近是不可能存在任何天体的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。