共查询到19条相似文献,搜索用时 78 毫秒
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指出用传统的"平行线"模型和光速有限来解释光斑移动现象,当将情况推广到极限时,会出现一些局限,并提出了一种新的与实际情况更符合的"同心圆"模型,由此可以解释光斑移动现象. 相似文献
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超光速粒子存在的可能性及其性质是个值得探讨的课题,对超光速粒子的讨论,已有不少工作[1-4].《亚光速和超光速映射理论》以下简称《映射》)一文试图根据对立统一规律,建立亚光速和超光速粒子的统一理论,是应该肯定的.但所提出的“共存原理”没有根据. 按共存观点,超光速粒子与亚光速粒子有完全一一对应的共存关系,凡在加速器中的粒子碰撞时产生一个亚光速粒子就必须“同时产生”一个超光速粒子,这是与大量粒子物理实验的观测不符合的.即使根据《映射》一文的观点,也得不到这样的结果.从文中的(3.8)、(5.5)和(5.6)式可以推得而且沿用该文的… 相似文献
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全文的关键在于作者导出的“超光速洛仑兹变换”到底是什么意思?它有没有新的内容?它反映的是什么样的超光速运动的时空特性?它的客观依据是什么? 作者的意思是从所谓的“亚光速与超光速共存原理”出发,他实际上是从“对偶共存”假定出发,从而就可以认为所谓“超光速世界”不过就是“亚光速世界”的“映像”,而且假定在这个“映像”中的速度v要满足以完成其“对偶共存”的意图. 不管作者使用的是什么样的数学方法,但究其实质,为了得到满足他的“对偶共存”假定的“超光速洛仑兹变换(4.11)或者(4.12)式,作者引用的“映射”’变换,其实就是令:… 相似文献
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反常色散介质“超光速”现象研究的新进展 总被引:2,自引:0,他引:2
文章介绍了王力军等人的光脉冲在反常色散介质传播实验的测量结果,说明了实验测量的不完全性,因而它不能在是否超光速的问题的答案,文章还介绍了近一年来相应的理论研究工作,文章作者依据物理概念和理论研究结果论证了该实验所得的负群速度本身并不超光速;如果把负群速度看成是某种能量的传播那私超光速出现在负群速度开始时间间,因而它是超距作用,违反能量守恒或动量守恒,因此,负群速度只是表观速度,能流的研究结果也证明了这一点。这就是说,该实验并没有观察 到超观察到超光速传播。 相似文献
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利用飞秒脉冲自相关技术研究了高质量三维胶体光子晶体中的慢光速和超光速效应.实验中使用的胶体光子晶体是采用压力控制的绝热沉积技术(PCIHVD)制备的、由聚苯乙烯小球组成的人工蛋白石结构.由于其中的缺陷和位错密度很低,它们具有很高的通带透过率和陡峭的能带边缘.测量了从通带到带边直至带隙中央群速度的变化,在只有20层左右小球的样品中观察到低至0.43c的慢光速以及高至1.34c的超光速现象.此外,利用时域有限差分(FDTD)方法对短脉冲在三维光子晶体中的群速度进行了数值模拟,并且和
关键词:
三维胶体光子晶体
慢光速
超光速
脉冲自相关 相似文献
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光拍法测光速实验中的几个误解 总被引:1,自引:0,他引:1
利用光拍法测光速的实验中主要存在3个误解.笔者结合实验教学,从光拍频波的原理、光拍频波的形成和传播以及光拍频波的接收和光路调节3个方面,对光拍法测光速实验中易产生误解的内容进行了剖析并给予澄清. 相似文献
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The Extragalactic Background Light (EBL) stands for the mean surface brightness of the sky as we would see it from a representative vantage point in the intergalactic space outside of our Milky Way Galaxy. Averaged over the whole 4π solid angle it represents the collective light from all luminous matter radiated throughout the cosmic history. Part of the EBL is resolved into galaxies that, with the increasing detecting power of giant telescopes and sensitive detectors, are seen to deeper and deeper limiting magnitudes. This resolved part is now known to contribute a substantial or even the major part of the EBL. There still remains, however, the challenge of finding out to what extent galaxies too faint or too diffuse to be discerned individually, individual stars or emission by gas outside the galaxies, or – more speculatively – some hitherto unknown light sources such as decaying elementary particles are accounting for the remaining EBL. We review the recent progress that has been made in the measurement of EBL. The current photometric results suggest that there is, beyond the resolved galaxies, an EBL component that cannot be explained by diffuse galaxy halos or intergalactic stars. 相似文献
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Whether an additional light scalar exists is an interesting topic in particle physics beyond the Standard Model(SM), as we do not know as yet the nature of physics beyond the SM in the low mass region in view of the inconsistent results of the ATLAS and CMS collaborations in their search for light resonances around 95 GeV in the diphoton channel. We study a light scalar in the Minimal Dilaton Model(MDM). Under the theoretical and the latest experimental constraints, we sort the selected data samples into two scenarios according to the diphoton rate of the light scalar: the large-diphoton scenario(with σ_(γγ)/SM■0.2) and the small-diphoton scenario(with σ_(γγ)/SM■0.2),which are favored by the CMS and ATLAS results, respectively. We compare the two scenarios, test the characteristics of the model parameters, the scalar couplings, production and decay, and consider how they could be further discerned at colliders. We draw the following conclusions for the two scenarios:(i) The large-diphoton scenario has in general a small Higgs-dilaton mixing angle(|sinθ_S|■0.2) and a small dilaton vacuum expectation value(VEV)f(0.5■η≡ v/f■1),and the small-diphoton scenario has large mixing(| sinθ_S|■0.4) or large VEV(η≡v/f ■0.3).(ii) The large-diphoton scenario in general predicts small syy coupling(|C_(sγγ)/SM|■ 0.3) and large sgg coupling(0.6■|C_(sgg)/SM|■1.2), while the small-diphoton scenario predicts small sgg coupling(|C_(sgg)/SM|■0.5).(iii) The large-diphoton scenario can interpret the small diphoton excess seen by CMS at its central value, when m_s■ 95 GeV,η■0.6 and | sinθ_S|■0.(iv) The large-diphoton scenario in general predicts a negative correlation between the Higgs couplings |C_(hγγ)/SMI and |C_(hgg)/SM|, while the small-diphoton scenario predicts that both couplings are smaller than 1,or |C_(hγγ)/SM|■0.9■|C_(hgg)/SM|. 相似文献
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Indirect measurement of the intensity of incident light by the light transmission fluctuation method
The light transmission fluctuation method is a simple and useful method for in situ and in-line measurement of particle size and concentration. To accomplish the measurement, it is necessary to know the intensity of incident light or background signal I(0). However, measuring I(0) during in-line applications is hard. In this Letter, an algorithm is proposed to indirectly measure I(0) based on the variation of transmitted light signals. Experiments have been carried out to verify the algorithm and the maximum deviation between premeasured I(0) and indirectly measured I(0)' is less than 2.5%. 相似文献
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读出光光源对液晶光阀实验的影响 总被引:3,自引:1,他引:2
液晶光阀实验中一般是用带布氏窗的He-Ne激光器作为读出光光源,本文分析了普通He-Ne激光、半导体激光、卤素灯等常见光源在液晶光阀实验中应用的可能性和各自特点并进行了实验验证. 相似文献
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M. Giurgea 《Czechoslovak Journal of Physics》1970,20(5):639-639
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T.K. Melik-Barkhudarov 《Physics letters. A》1981,82(3):109-110
An expression for the resonance radiation pressure is found in the framework of the Weisskopf-Wigner theory. It is shown, that at saturation its value is twice that of the phenomenological theory. 相似文献