共查询到20条相似文献,搜索用时 281 毫秒
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ZONGHong-Shi QIShi CHENWei WUXiao-Hua 《理论物理通讯》2003,40(6):675-680
A new approach for calculating vacuum susceptibilities from an effective quark-quark interaction model is derived. As a special case, the vector vacuum susceptibility is calculated. A comparison with the results of the previous approaches is given. 相似文献
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The pion and tensor vacuum susceptibilities are calculated in the
framework of the renormalizable Dyson-Schwinger equations. A comparison
with the results of other nonperturbative QCD approaches is given. 相似文献
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J.Q. Shen 《Annalen der Physik》2010,522(7):524-531
An isotropic electromagnetic medium becomes gyrotropically anisotropic when it moves, and an anisotropic electromagnetic environment can then be created in this motion‐induced anisotropic medium. One of the most remarkable features is that the quantum vacuum in the anisotropic electromagnetic environment exhibits a nonzero electromagnetic momentum density, since the universal symmetry of the vacuum fluctuation field is broken, and the anisotropic quantum vacuum mode structure is produced because of the symmetry breaking. This would give rise to a noncompensation effect among the four vacuum eigenmodes (i.e., the forward and backward propagating modes as well as their respective mutually perpendicular polarized components), and leads to an anisotropic correction to the vacuum momentum in the moving medium. The physical significance and the potential applications of the anisotropic quantum vacuum are discussed. This quantum‐vacuum effect may be used to develop sensitive sensor techniques and to design new quantum optical and photonic devices. 相似文献
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采用无规相近似(RPA)耦合集团展开方法,计算出2?+1维SU(2?)格点规范场的三到六阶真空波函数和真空能量.在计算中,用空心图构成试探波函数,得到的三到六阶真空波函数的计算结果在弱耦合区1g2〉1.2都表现出良好的标度行为.与较早的计算结果比较,采用RPA方法计算的真空波函数比采用非RPA方法计算的结果的标度行为有大幅度的改善.采用RPA方法计算的真空能量比采用非RPA方法计算的真空能量略低,这表明此方法是成功的方法. 相似文献
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The spectral radiance of vacuum ultraviolet (UV) target is of crucial significance to plenty of researches including deep space exploration and spacecraft damage test. Two types of test systems and methods for vacuum UV light sources were studied. Through the research of test method for vacuum UV spectral radiance, a corresponding test system was developed, which included vacuum UV standard light source, optical imaging system, light splitting module, vacuum UV detector module, vacuum chamber and data processing system. According to the direct measurement method and the comparative method, the spectral radiance of deuterium lamps was tested and analyzed, the influencing factors and the relative index error of vacuum UV spectral radiance were discussed, and the accurate measurement of vacuum UV spectral radiance in the five wavelength ranges of 121.2 nm, 135.6 nm, 160 nm, 180 nm, 200 nm at 0.01 μW/cm2·nm·sr~1 μW/ cm2·nm·sr was realized. The repeatability of the measurement is 0.001 34, which shows that the proposed test system can realize the test of vacuum UV signal. © 2022 Editorial office of Journal of Applied Optics. All rights reserved. 相似文献
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A scheme of two-dimensional(2D) atom localization induced by a squeezed vacuum is proposed, in which the threelevel V-type atoms interact with two classical standing-wave fields. It is found that when the environment is changed from an ordinary vacuum to a squeezed vacuum, the 2D atom localization is realized by detecting the position-dependent resonance fluorescence spectrum. For comparison, we demonstrate that the atom localization originating from the quantum interference effect is distinct from that induced by a squeezed vacuum. Furthermore, the combined effects of the squeezed vacuum and quantum interference are also discussed under appropriate conditions. The internal physical mechanism is analyzed in terms of dressed-state representation. 相似文献
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We study vacuum of QCD in this work. The structure of non-local
quark vacuum condensate, values of various local quark and gluon
vacuum condensates, quark-gluon mixed vacuum condensate, quark and
gluon virtuality in QCD vacuum state, quark dynamical mass and
susceptibility of QCD vacuum state to external field are predicted by use of the solutions of Dyson-Schwinger equations in “rainbow”
approximation with a modeling gluon propagator and three different
sets of quark-quark interaction parameters. Our theoretical
predictions are in good agreement with the correspondent empirical
values used widely in literature, and many other theoretical
calculations. The quark propagator and self-energy functions are
also obtained from the numerical solutions of Dyson-Schwinger
equations. This work is centrally important for studying
non-perturbative QCD, and has many important applications both in
particle and nuclear physics. 相似文献
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ZHOU Li-Juan WU Qing MA Wei-Xing 《理论物理通讯》2008,50(7):161-174
We study vacuum of QCD in this work. The structure of non-local quark vacuum condensate, values of various local quark and gluon vacuum condensates, quark-gluon mixed vacuum condensate, quark and gluon virtuality in QCD vacuum state, quark dynamical mass and susceptibility of QCD vacuum state to external field are predicted by use of the solutions of Dyson-Schwinger equations in "rainbow" approximation with a modeling gluon propagator and three different sets of quark-quark interaction parameters. Our theoretical predictions are in good agreement with the correspondent empirical values used widely in literature, and many other theoretical calculations. The quark propagator and self-energy functions are also obtained from the numerical solutions of Dyson Schwinger equations. This work is centrally important for studying non-perturbative QCD, and has many important applications both in particle and nuclear physics. 相似文献
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Some power series expansions for the vacuum projection operator of paraboson and parafermion are derived. A recursion method is essential to these derivations of the power series expansion in terms of creation and annihilation operators of the paraparticles. 相似文献
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傅谦 《核聚变与等离子体物理》1985,(2)
为了使E-580型真空紫外摄谱仪能够运用在等离子体诊断实验中,我们用Okazaki等的实验方法,以角向箍缩等离子体为光源,对它作了强度校准。 真空紫外摄谱仪及等离子体光源的情况见文献[2,3],仪器布置同文献[1],本实验选用9对谱线,见表1。 图1是OⅥ150和OⅥ3811的示波图(第二半周內波形),全屏扫描时间约12μs。在信号 相似文献
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Michal Demetrian 《International Journal of Theoretical Physics》2007,46(3):652-663
The vacuum decay in a de Sitter universe is studied for the class of effective inflaton potentials that curvature at the top
is less than as well as greater than a critical value determined previously. By comparing the actions of the Hawking - Moss
instanton and the Coleman - de Luccia instanton(s) the mode of vacuum decay is determined in this critical situation. 相似文献
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A study is made of the steady-state populations of a three-level ladder atom in a squeezed vacuum, driven by a superposition of a monochromatic laser wave with incoherent population pumping. Using the density matrix equations for the system, the steady-state populations are calculated numerically and shown graphically as functions of two-photon detuning for various cases of the squeezed vacuum and different incoherent pump rates. It is shown that the incoherent population pumping tends to greatly decrease the two-photon absorption from the squeezed vacuum. 相似文献