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QGP中等离子激元的本征质量
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作者 方洁 刘绘 +1 位作者 方芳 孙红 《华中师范大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第4期436-439,共4页
在QGP动力论框架下,既讨论了夸克质量等于零时,QGP中等离子激元的本征质量的解析表达式及其它对化学势和温度的依赖关系,又研究了夸克质量不等于零,如在讨论奇异夸克物质时,应考虑奇异夸克数s,通过对化学势,温度及相关量赋值,计算了QGP... 在QGP动力论框架下,既讨论了夸克质量等于零时,QGP中等离子激元的本征质量的解析表达式及其它对化学势和温度的依赖关系,又研究了夸克质量不等于零,如在讨论奇异夸克物质时,应考虑奇异夸克数s,通过对化学势,温度及相关量赋值,计算了QGP中等离子激元的本征质量的数值积分,作出了本征质量的等化学势,等温度线,分析了夸克和胶子对本征质量贡献的大小,并与夸克质量为零时的极端相对论情况作了比较. 展开更多
关键词 QGP 本征质量 夸克胶子等离子体 等离子体激元 动力论 多时标方法 化学势
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New schemes with fractal error compensation for PDE eigenvalue computations 被引量:6
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作者 SUN JiaChang 《Science China Mathematics》 SCIE 2014年第2期221-244,共24页
With an error compensation term in the fractal Rayleigh quotient of PDE eigen-problems,we propose a new scheme by perturbing the mass matrix Mhto Mh=Mh+Ch2mKh,where Khis the corresponding stif matrix of a 2m 1 degree ... With an error compensation term in the fractal Rayleigh quotient of PDE eigen-problems,we propose a new scheme by perturbing the mass matrix Mhto Mh=Mh+Ch2mKh,where Khis the corresponding stif matrix of a 2m 1 degree conforming finite element with mesh size h for a 2m-order self-adjoint PDE,and the constant C exists in the priority error estimationλh jλj^Ch2mλ2j.In particular,for Laplace eigenproblems over regular domains in uniform mesh,e.g.,cube,equilateral triangle and regular hexagon,etc.,we find the constant C=I h 1Mh2 hKh and show that in this case the computation accuracy can raise two orders,i.e.,fromλh jλj=O(h2)to O(h4).Some numerical tests in 2-D and 3-D are given to verify the above arguments. 展开更多
关键词 PDE eigenvalues computation generalized matrix eigen-problem discrete Rayleigh quotient
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Weighing neutrinos in dynamical dark energy models 被引量:1
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作者 Xin Zhang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2017年第6期86-88,共3页
The discovery of neutrino oscillation indicates that neutrinos have masses and each flavor state is actually a superposition of three mass states with masses m1,m2,and m3.However,the neutrino oscillation experiments a... The discovery of neutrino oscillation indicates that neutrinos have masses and each flavor state is actually a superposition of three mass states with masses m1,m2,and m3.However,the neutrino oscillation experiments are not able to measure the absolute masses of neutrinos,but can only measure the squared mass differences between the neutrino mass eigenstates—The solar and reactor experiments gave 展开更多
关键词 dynamical superposition accelerator flavor inverted absolute hierarchy actually oscillation constraint
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Unconventional materials:the mismatch between electronic charge centers and atomic positions 被引量:2
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作者 Jiacheng Gao Yuting Qian +5 位作者 Huaxian Jia Zhaopeng Guo Zhong Fang Miao Liu Hongming Weng Zhijun Wang 《Science Bulletin》 SCIE EI CSCD 2022年第6期598-608,M0003,M0004,共13页
The complete band representations(BRs)have been constructed in the work of topological quantum chemistry.Each BR is expressed by either a localized orbital at a Wyckoff site in real space,or by a set of irreducible re... The complete band representations(BRs)have been constructed in the work of topological quantum chemistry.Each BR is expressed by either a localized orbital at a Wyckoff site in real space,or by a set of irreducible representations in momentum space.In this work,we define unconventional materials with a common feature of the mismatch between average electronic centers and atomic positions.They can be effectively diagnosed as whose occupied bands can be expressed as a sum of elementary BRs(eBRs),but not a sum of atomic-orbital-induced BRs(aBRs).The existence of an essential BR at an empty site is described by nonzero real-space invariants(RSIs).The"valence"states can be derived by the aBR decomposition,and unconventional materials are supposed to have an uncompensated total"valence"state.The high-throughput screening for unconventional materials has been performed through the first-principles calculations.We have discovered 423 unconventional compounds,including thermoelectronic materials,higher-order topological insulators,electrides,hydrogen storage materials,hydrogen evolution reaction electrocatalysts,electrodes,and superconductors.The diversity of these interesting properties and applications would be widely studied in the future. 展开更多
关键词 Unconventional materials Band representations Real-space invariants Thermoelectric materials
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Electronic Structure of Helium Atom in a Quantum Dot
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作者 Jayanta K.Saha S.Bhattacharyya T.K.Mukherjee 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第3期347-353,共7页
Bound and resonance states of helium atom have been investigated inside a quantum dot by using explicitly correlated Hylleraas type basis set within the framework of stabilization method.To be specific,precise energy ... Bound and resonance states of helium atom have been investigated inside a quantum dot by using explicitly correlated Hylleraas type basis set within the framework of stabilization method.To be specific,precise energy eigenvalues of bound 1sns(~1S^e)(n=1-6)states and the resonance parameters i.e.positions and widths of^lS^e states due to 2sns(n=2-5)and 2pnp(n=2-5)configurations of confined helium below N=2 ionization threshold of He^+have been estimated.The two-parameter(Depth and Width)finite oscillator potential is used to represent the confining potential due to the quantum dot.It has been explicitly demonstrated that the electronic structural properties become sensitive functions of the dot size.It is observed from the calculations of ionization potential that the stability of an impurity ion within a quantum dot may be manipulated by varying the confinement parameters.A possibility of controlling the autoionization lifetime of doubly excited states of two-electron ions by tuning the width of the quantum cavity is also discussed here. 展开更多
关键词 helium atom variational method quantum dot CORRELATION
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