共查询到20条相似文献,搜索用时 78 毫秒
1.
A. L. Garcia-Perciante L. S. Garcia-Colin Alfredo Sandoval-Villalbazo 《General Relativity and Gravitation》2009,41(7):1645-1654
It is shown that the so-called generic instabilities that appear in the framework of relativistic linear irreversible thermodynamics
(LIT), describing the fluctuations of a simple fluid close to equilibrium, arise due to the coupling of heat with hydrodynamic
acceleration which appears in Eckart’s formalism of relativistic irreversible thermodynamics. Further, we emphasize that such
behavior should be interpreted as a contradiction to the postulates of LIT, namely a violation of Onsager’s hypothesis on
the regression of fluctuations, and not as fluid instabilities. Such contradictions can be avoided within a relativistic linear
framework if a Meixner-like approach to the phenomenological equations is employed. 相似文献
2.
The oblique propagation of the quantum electrostatic solitary waves in magnetized relativistic quantum plasma is investigated using the quantum hydrodynamic equations. The plasma consists of dynamic relativistic degenerate electrons and positrons and a weakly relativistic ion beam. The Zakharov‐Kuznetsov equation is derived using the standard reductive perturbation technique that admits an obliquely propagating soliton solution. It is found that two types of quantum acoustic modes, that is, a slow acoustic mode and fast acoustic mode, could be propagated in our plasma model. The parameter that determines the nature of soliton, that is, compressive or rarefactive soliton, for slow mode is investigated. Our numerical results show that for the slow mode, the determining parameter is ion beam velocity in the case of relativistic degenerate electrons. We also have examined the effects of plasma parameters (like the beam velocity, the density ratio of positron to electron, the relativistic factor, and the propagation angle) on the characteristics of solitary waves. 相似文献
3.
Gang Li Bin Zhu Yuchi Wu Feng Lu Fang Tan Tiankui Zhang Yue Yang Minghai Yu Yonghong Yan Wei Fan Yuqiu Gu 《等离子体物理论文集》2019,59(10)
A chirped laser pulse indicates that the laser frequency changes over the duration of the pulse: a positively (negatively) chirped pulse implies that the laser frequency increases (decreases) with time. In this paper, we use a simplified, fully relativistic hydrodynamic approach to simulate the influence of chirp on the propagation of a femtosecond relativistic laser pulse in underdense plasma. Based on this simplified cold‐fluid model, the influence of chirp on the main dynamics of the laser pulse, such as self‐steepening, red‐shift in the leading edge, variation of the frequency chirp, and the generated wakefields can be studied self‐consistently. The simulation results show that a pulse with a positive chirp results in a larger increment in the intensity parameter a0 when propagating a certain distance into an underdense plasma compared with an un‐chirped and a negatively chirped pulse, which is largely because of a much greater forward shift of the peak amplitude and more severe pulse self‐steepening effect due to the frequency red‐shift at the leading edge when exciting a plasma wave. The ponderomotive force, which relates to the first‐order differential of the laser pulse intensity envelope, is expected to be stronger for a positively chirped pulse because of its steeper leading edge and larger intensity parameter a0. As a result, the wakefield driven by the positively chirped laser pulse is more intense than that driven by an un‐chirped and a negatively chirped laser pulse, which is confirmed by our self‐consistent hydrodynamic simulation. 相似文献
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Comparing the relativistic and nonrelativistic frame works, we study
the effect of the relativistic center-of-mass vector on the electric
polarizability of a compound system. 相似文献
6.
We develop a relativistic nuclear structure model,
relativistic consistent angular-momentum projected
shell-model (RECAPS), which combines the relativistic mean-field
theory with the angular-momentum projection method. In this new
model, nuclear ground-state properties are first calculated
consistently using relativistic mean-field (RMF) theory. Then angular
momentum projection method is used to project out states with good
angular momentum from a few important configurations. By
diagonalizing the hamiltonian, the energy levels and wave
functions are obtained. This model is a new attempt for the
understanding of nuclear structure of normal nuclei and for the
prediction of nuclear properties of nuclei far from stability. In
this paper, we will describe the treatment of the relativistic mean
field. A computer code, RECAPS-RMF, is developed. It solves the
relativistic mean field with axial-symmetric deformation in the
spherical harmonic oscillator basis. Comparisons between our
calculations and existing relativistic mean-field calculations
are made to test the model. These include the ground-state
properties of spherical nuclei 16O and 208Pb, the
deformed nucleus 20Ne. Good agreement is obtained. 相似文献
7.
用非相对论、标量相对论和二分量相对论三种不同的密度泛函方法对UF_6分子的电子结构进行了量子化学计算,并利用编写的程序计算出了三种方法下各个价轨道的电子动量谱,比较了三种方法计算的价轨道能级及动量分布的差异.结果表明,相对论效应不仅使UF_6的能级劈裂和移动,而且对部分价轨道电子动量分布有显著的影响. 相似文献
8.
Two-pion interferometry at small relative momentum for pion sources with transverse and longitudinal expansions in relativistic heavy ion collisions 下载免费PDF全文
A two-pion correlation function at small relative momentum for pion sources with transverse and longitudinal expansions in relativistic heavy ion collisions is obtained using two-pion interferometry at small relative momentum, and the relations between the real and apparent parameters of the pion source are given. The relations can be used to extract both the temperature and the transverse and longitudinal expansion velocities of pion sources and to verify the correctness of relativistic transformation T′=T\sqrt {1-v^2} of temperature in relativistic statistical mechanics and thermodynamics. 相似文献
9.
The presence of relativistic electrons in the Earth's magnetosphere may excite EMEC waves via resonant interaction. The understanding of EMEC waves induced by such electrons requires relativistic treatment. Therefore, we present here the investigation of EMEC waves based on relativistic trapped electrons represented by kappa-Maxwellian distribution in auroral plasmas. The analytical expressions of real frequency and relativistic growth rate are derived. Our numerical outcomes report that relativistic approximation increases the wave growth and causes reduction in the threshold value of drift velocity of trapped electrons for instability. The wave frequency that corresponds to the maximum growth decreases as we go from nonrelativistic limit to relativistic. The maximum growth increases with the increment in plasma frequency, perpendicular thermal velocity, drift velocity of trapped electrons, and Lorentz factor γ. Moreover, the relativistic effects on maximum growth are more pronounced for smaller values of drift velocity and perpendicular thermal velocity. 相似文献
10.
通过巧妙地让陈子定理包含光速,可以得到粒子运动的相对论速度基本关系.根据这个相对论速度基本关系,可以推导出相对论质点动力学方程,能量质量关系,动量能量关系,洛伦兹变换等结果. 相似文献
11.
NonlinearEvolutionofDrivenElectronPlasmaOscillationsinInhomogeneousPlasmas¥SHENGZhengming;XUZhizhan;YUWei;MAJinxiu(ShanghaiIn... 相似文献
12.
基于一个描述夸克胶子火柱演化的相对论流体力学模型,研究了夸克相、强子相互作用以及非热过程(DrellYan对、粲强子衰变)的中等质量双轻子的产生.发现由于相边对夸克胶子物质演化的影响和RHIC能量核碰撞产生的夸克胶子物质具有高的初始温度,夸克相对双轻子的贡献显著增强,比那些来自强子相互作用的贡献重要,甚至能与来自非热的贡献比较.表明中等质量双轻子的增强是一个在核碰撞中产生了夸克胶子物质的可能信号.
关键词:
夸克-胶子物质
双轻子增强
相对论流体力学模型 相似文献
13.
A relativistic quasi-static model for the motion of the electrons in relativistic laser fields is proposed. Using the model, the recent experimental results about the generation of the hot electrons in relativistic laser fields can be fit quite well and the important role of the rescattering can be shown clearly. 相似文献
14.
Marek Dudyński 《Journal of statistical physics》1989,57(1-2):199-245
Solutions are analyzed of the linearized relativistic Boltzmann equation for initial data fromL
2(r, p) in long-time and/or small-mean-free-path limits. In both limits solutions of this equation converge to approximate ones constructed with solutions of the set of differential equations called the equations of relativistic hydrodynamics. 相似文献
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We present an analytical model for the electron energy loss through a two-dimensional (2D) layer of graphene, fully taking into account relativistic effects. Using two different models for graphene's 2D conductivity, one a two-fluid hydrodynamic model with an added correction to account for the inter-band electron transitions near the Dirac point in undoped graphene, the other derived from ab initio plane-wave time-dependent density functional theory in the frequency domain (PW-TDDFT-ω) calculations applied on a graphene superlattice, we derive various different expressions for the probability density of energy and momentum transfer from the incident electron to graphene. To further compare with electron energy loss spectroscopy (EELS) experiments that use setups like scanning Transmission Electron Microscopy, we integrated our energy loss functions over a range of wavenumbers, and compared how the choice of range directly affects the shape, position, and relative heights of graphene's π → π* and σ → σ* transition peaks. Comparisons were made with experimental EELS data under different model inputs, revealing again the strong effect that the choice of wavenumber range has on the energy loss. 相似文献
17.
多注相对论速调管相对于常规相对论速调管, 每注电子束具有更低的导流系数和更低的空间电荷力, 却具有更高的束波转换效率. 本文基于这方面的需求, 通过三维软件模拟与实验研究了扇形多注强流相对论电子束的产生与传输. 通过建立电子枪的三维模型, 分析了阴极端面静电场的分布及其对电子束产生的影响; 通过粒子模拟获得了发射束流, 然后通过粒子跟踪仿真, 得到了电子束在空心漂移管和多扇形孔漂移管中传输的束斑图, 并对其进行了理论分析与解释. 模拟和实验结果表明, 电子束在空心漂移管传输过程中不仅绕束自身中心旋转, 还绕系统的中心旋转, 通过旋转多扇形孔漂移管实现对中的方法可提高传输效率. 相似文献
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对《大学物理》2000年第11期上发表的《氢原子的磁矩-对自旋的讨论之一》一提出了不同的看法,认为该错把相对论的流密度当成了非相对论的流密度,前不能在非相对论近似下过滤到后,在相对论情况下,自旋和轨道耦合在一起,不能互相独立,在非相对论情况下自旋独立于轨道运动而存在;因而,自旋不是轨道角动量的相对论效应。 相似文献