Hawking radiation of stationary and non-stationary Kerr–de Sitter black holes

Hawking radiation of the stationary Kerr–de Sitter black hole is investigated using the relativistic Hamilton–Jacobi method. Meanwhile, extending this work to a non-stationary black hole using Dirac equations and generalized tortoise coordinate transformation, we derived the locations, the temperature of the thermal radiation as well as the maximum energy of the non-thermal radiation. It is found that the surface gravity and the Hawking temperature depend on both time and different angles. An extra coupling effect is obtained in the thermal radiation spectrum of Dirac particles which is absent from thermal radiation of scalar particles. Further, the chemical potential derived from the thermal radiation spectrum of scalar particle has been found to be equal to the highest energy of the negative energy state of the scalar particle in the non-thermal radiation for the Kerr–de Sitter black hole. It is also shown that for stationary black hole space time, these two different methods give the same Hawking radiation temperature.

The Reduced Planck＇s Constant, Mach＇s Principle, Cosmic Acceleration and the Black Hole Universe

Based on the Mach＇s principle and the characteristic mass of the present universe, Mo a c3/2GHo, it is noticed that, ＇rate of decrease in the laboratory fine structure ratio＇ is a measure of the cosmic rate of expansion. If the observed laboratory fine structure ratio is a constant, then, independent of the cosmic red shift and CMBR observations, it can be suggested that, at present there is no cosmic acceleration. Obtained value of the present Hubble constant is 70.75 Km/sec/Mpc. If it is true that, rate of decrease in temperature is a measure of cosmic rate of expansion, then from the observed cosmic isotropy it can also be suggested that, at present there is no cosmic acceleration. At present if the characteristic mass of the universe is, Mo = c3/2GHo and if the primordial universe is a natural setting for the creation of black holes and other non-perturbative gravitational entities, it is also possible to assume that throughout its journey, the whole universe is a primordial growing and light speed rotating black hole. At any time, if cot is the angular velocity, then cosmic radius is c/ω1 and cosmic mass is c3/2Gω1 Instead of the Planck mass, initial conditions can be addressed with the Coulomb mass = Mc = √/4xeoG At present, if ω1= H0 the cosmic black hole＇s volume density, observed matter density and the thermal energy density are in geometric series and the geometric ratio is 1 ＋ ln（M0 ＋Mc）.

Non-Rotating Black Holes, Dark Matter and Dark Energy in a Unifying Theory

The theory here developed, makes use of the decomposition of matter (mass) in different spatial frequencies k’s using spatial Fourier transforms, and the posterior use of modified inverse Fourier transforms to construct an accurate description of the classical Newtonian gravitational field. Introducing the concept of quantization of the spatial frequency k, which means allowing only discrete values, such as km, 2km, 3km, leads to the appearance of extra gravitational force regions that occur at distances equally spaced apart in 2π/km. These areas of extra gravitational force decrease inscribed in an inverse of the distance envelope (1/r). The value of 2π/km can be adjusted to be of the order of kiloparsec (kpc), being this way a plausible explanation for the effect of the dark matter since this causes practically flat rotation curves for most of the galaxies. As these regions of extra gravitational force also have adjacent areas of negative values (repulsive gravitational force), it is possible to show that any mass placed in the gravitational field far from the galaxy center will acquire, on average, a null acceleration, thereby remains the “light push,” or in other words, the “mean luminosity density” between galaxies as an explanation for the accelerating expansion of the universe, today being considered mainly due to dark energy. Along with the article, it is showed that the effect of light push is sufficient to explain the expansion of the universe. The present work also explains the nonlinear behavior of gravitational fields near massive objects such as blackholes, not contradicting the theory of general relativity, instead giving a complementary description of how black holes work, even describing the gravitational field internally to it, which is not available in the GR theory.

Fermions dynamic equation with Lorentz invariance violation and the corrected Hawking temperature in arbitrarily accelerating black hole

Containing Lorentz invariance violation(LIV),a new form of the fermions dynamic equation under the background of the curved space-time of the arbitrarily accelerating black hole,is studied.Firstly,we consider the new form of the fermions dynamic equation with arbitrary spin containing LIV in curved space-time,and research the fermions dynamic equation with spin-1/2containing LIV.On this basis,according to the semi-classical theory and black hole quantum tunneling radiation theory,the quantum tunneling radiation of the arbitrarily accelerating Kinnersly black hole is modified correctly,and the corrected physical quantities such as black hole temperature and quantum tunneling rate are deeply discussed.The fermions dynamic equation with arbitrary spin in the arbitrarily accelerating black hole space-time and its solution are explained in detail.In order to further obtain the correction effect of the Planck scale,this article considers beyond the semi-classical theory and further obtains new expressions of the black hole temperature and tunneling radiation rate.

Rotating Bardeen black hole surrounded by perfect fluid dark matter as a particle accelerator

We study the event horizon of a rotating Bardeen black hole surrounded by perfect fluid dark matter and the black hole as a particle accelerator.The black hole is represented by four parameters:mass M,rotation parameter a,dark matter parameterαand magnetic charge g.It is interesting that when we determine the values of magnetic charge g and dark matter parametersαwe can get a critical rotation parameter aEand then we get a contour plane withΔ=0 taking three parameters as coordinates.We also derive the effective potential of the particle and the center-of-mass(CM)energy of the two particles outside the black hole by using the motion equations of the particle in the equatorial plane of the black hole.We find that the CM energy depends not only on the rotation parameter a,but also on the parameters g andα.We discuss the CM energy for two particles colliding at the black hole horizon in the extreme and non-extreme cases,respectively.It is found that the CM energy can become arbitrarily high when the angular momentum of one of the two particles is the critical angular momentum under the background of extreme black holes and there is no such result for non-extreme black holes,because the particles do not reach the black hole horizon when the angular momentum of the particles is critical angular momentum.Therefore,we prove that the rotating Bardeen black hole surrounded by perfect fluid dark matter can be used as a particle accelerator.

基于声学黑洞动力吸振器的冰箱压缩机振动抑制研究

压缩机是家用冰箱的主要振动激励源,在压缩机振动传递路径上附加动力吸振器,可以有效抑制压缩机的振动能量,同时成本低。声学黑洞(ABH)具有对弯曲波的能量集中特征,因而可以通过在其末端附加阻尼材料以实现能量耗散的目的,进而实现结构振动抑制。但由于ABH结构其主要功用在于高频段,其在实际工程减振降噪方面的应用还存在一定局限。因此,针对冰箱压缩机振动噪声问题,设计了一种用于抑制压缩机振动的ABH动力吸振器。首先,使用半解析法建立了ABH动力吸振器理论模型,并使用有限元方法验证了该模型的准确性;然后,计算了ABH动力吸振器的模态损耗因子,分析了该模型在压缩机振动能量集中区域的抑制效果;最后,为了进一步验证该ABH吸振器在压缩机上的控制效果,根据设计参数,采用3D打印的方式加工了该ABH动力吸振器,并将ABH动力吸振器黏附在冰箱压缩机机脚,用于抑制压缩机的振动传递,从而降低冰箱噪声。实验结果表明:在低速2 700 r/min和高速3 900 r/min的2种运转工况下,冰箱压缩机在20 Hz~1 000 Hz频率范围内的前10阶次中,平均有8个阶次以上的振动响应幅值得到了有效抑制。研究结果表明:该ABH动力吸振器具有良好的振动衰减作用。

Strong Cosmic Censorship in accelerating spacetime

It has been established that Strong Cosmic Censorship Conjecture(SCCC)is respected by an asymptotically flat black hole with charge,but violated by a charged asymptotically de Sitter black hole.We studied the instability of the Cauchy horizon for an accelerating black hole in Einstein theory conformally coupled with a scalar field.The black hole is uncharged while having inner,outer,and acceleration horizons.In the limit of vanishing acceleration,denoted by A→0,it becomes asymptotically flat and extremal,with its acceleration horizon vanishing as well.By exploring the perturbation of the massless scalar field upon the accelerating black hole,whose decay rate is governed by the quasinormal mode spectra,we show that the SCCC is violated in the near-extremal regime and also in the A→0+limit.Our result is the first observation of a black hole violating the SCCC in an almost asymptotically Minkowskian flat regime,as well as the first example of a black hole violating the SCCC with neither charge nor rotation.

鱼雷自导新型基阵支撑结构减振设计及性能研究

为了减少传递到鱼雷自导基阵的振动能量,采用声学黑洞原理设计了一种多边形减振环结构。采用加速度振级落差表征其减振性能,开展激振器激励下的多边形结构减振性能试验研究。结果表明,多边形减振结构在50~10kHz的频率范围内具有良好的减振效果。试验结果充分说明了本文设计的多边形减振结构具有轻质、高效、宽频的减振特点,具有广泛的潜在应用价值。

基于声学黑洞的水下航行器承压板减振设计及性能研究

为了减少传递到水下航行器探测声学阵列承压板的振动能量,基于声学黑洞原理设计了一种减振圆板附属结构。采用加速度振级落差表征其减振性能,并分别开展了激振器轴向和径向激励下的承压板减振性能试验。研究结果表明,该减振圆板结构在50 Hz~10 kHz的频率范围内减振效果良好,充分说明了文中设计的减振圆板附属结构具有轻质、高效、宽频的减振特点,拥有广泛的潜在应用价值。

Rotating Charged Hairy Black Hole in(2+1) Dimensions and Particle Acceleration

In this paper, we construct rotating charged hairy black hole in(2+1) dimensions for infinitesimal black hole charge and rotation parameters. Then we consider this black hole as particle accelerator and calculate the centerof-mass energy of two colliding test particles near the rotating charged hairy black hole in(2+1) dimensions. As we expected, the center-of-mass energy has infinite value.

Acceleration of particles in Einstein-Maxwell-dilaton black holes

It has recently been pointed out that, under certain conditions, the energy of particles accelerated by black holes in the center-of-mass frame can become arbitrarily high. In this paper, we study the collision of two particles in the case of four-dimensional charged nonrotating, extremal charged rotating and near-extremal charged rotating Kaluza-Klein black holes as well as the naked singularity case in Einstein-Maxwell-dilaton theory. We find that the center-of-mass energy for a pair of colliding particles is unlimited at the horizon of charged nonrotating Kaluza-Klein black holes, extremal charged rotating Kaluza-Klein black holes and in the naked singularity case.

Thermal Radiation of a General Non-stationary Black Hole

The thermal radiation of the most general non-stationary black holes is discussed in this paper.The universal representatives determining the location of an event horizon and the temperature function are given.

一种研究动态非球对称黑洞熵的普适方法

A method with which one can calculate the entropy of a non-stationary and non-spherically symmetric black hole is suggested. This method is universal to every kind of black holes. By means of thin film model, the entropy density at every point of the event horizon is calculated first, then the total entropy is obtained through integration.

匀加速直线运动黑洞的熵

采用薄膜brick-wall模型，计算了Kinnersley度规表述的匀加速直线运动黑洞的熵.对于加速黑洞，时空具有轴对称性，视界面上各点的温度不是一个常数，首先计算视界面每一点的熵密度，再对视界面积分得到总熵.

吸积的宇宙

提出一个新的宇宙起源模型.在该模型中,认为我们居住其中的宇宙外面仍然是一个物质的世界,可称之为广义宇宙.在广义宇宙中,我们的宇宙可以看作是其中的一个吸积黑洞.从广义宇宙的概念和宇宙是吸积的概念出发,可以得出宇宙由于本身引力势能的原因在加速膨胀,不需要所谓的排斥能或暗能量,也回答了宇宙起源的问题.

再论暗物质、可能的暗能量与引力子/波——从宇宙微波背景辐射B模偏振之发现的物理学意义谈起

(1)论述了以宇宙大部分星系合并成的重力真空星的类似局部暴涨解释了宇宙加速膨胀的可能暗能量的高比例之源;也因此,哈佛-史密森天体物理学中心等BICEP2望远镜发现的宇宙微波背景辐射的B模式偏振信号,无论作为"宇宙暴涨的确凿证据",还是作为引力波的宇宙原初证据,均不一定成立的;其更大的可能性是宇宙暴涨与上述的类似局部暴涨的引力波叠加作用的结果。(2)论述了美国费米国家加速器实验室CDF2008年发现的疑似暗物质的标准模型之外的新粒子,可能是已有的Ω粒子。(3)BICEP2望远镜的前述发现有力地支持引力子的单手性,为中国本文作者2012年提出的左旋中微子(中微子震荡不足以证明其非零质量)与引力子可能的一致性提供进一步的佐证,为4种力的广义统一提供新的可能性。

考虑旋转备用约束的含风电场电力系统优化调度模型

文章建立电场电力系统优化调度模型,该模型考虑了风电功率预测误差的情况下,系统旋转备用容量满足负荷及风电波动的需求。模型中涉及火电机组、风电场的发电成本以及火电机组环境污染惩罚费用,并提出基于时变加速度的随机黑洞粒子群算法对模型进行求解,时变加速度增强了算法早期全局搜索能力,并保证迭代后期收敛到全局最优,同时黑洞原理避免了算法收敛早熟,陷入局部最优解。最后对含一个风电场的10机系统算例建模仿真,从而验证模型以及算法的合理性和有效性。

电磁加速黑洞视界处的温度函数及黑洞加速定理

得到了电磁直线加速黑洞的Ｄｉｒａｃ粒子的动力学方程在视界附近的渐近解，详细讨论了这类黑洞的视界年温度分布并给出黑洞加速度的极限值．

加速旋转荷电黑洞视界面积量子化

黑洞视界面积量子化问题是理论物理研究的前沿课题,也是近些年科学讨论的热点问题,现在人们对黑洞视界面积量子化问题等内容进行了一系列的研究,也已经取得了一些成果,但是有一些相关理论的研究还需要深入。通过近视界近似,利用绝热协变量,采用Bohrsommerfeld量子化原则和黑洞热力学第一定律,研究了不同坐标系下电荷磁荷加速旋转荷电黑洞的视界面积量子化及熵的量子化问题。总而言之,将绝热协变量量子化视界面积推广到对复杂荷电黑洞的视界面积量子化问题的分析和讨论。其核心关键技巧是绝热协变量的方法。最后得到的结果表明,黑洞的面积谱是等间距的,与本身黑洞参数无关。

用新乌龟坐标计算任意直线加速带电黑洞的熵

利用新乌龟坐标计算了任意直线加速带电黑洞的熵,简化了截断因子,并得到了黑洞熵与黑洞视界面积成正比的结论.而且截断因子与稳态黑洞的相同,都为90β.