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Phenomenological study of the anisotropic quark matter in the two-flavor Nambu–Jona–Lasinio model

Nuclear Science and Techniques 2022年第11期33卷 170-190页

作者： He-Xia Zhang Yu-Xin Xiao Jin-Wen Kang Ben-Wei Zhang Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China

With the two-flavor Nambu–Jona–Lasinio (NJL) model, we carried out a phenomenological study on the chiral phase structure, mesonic properties, and transport properties of momentum-space anisotropic quark matter. To calculate the transport coefficients we utilized the kinetic theory in the relaxation time approximation, where the momentum anisotropy is embedded in the estimation of both the distribution function and relaxation time. It was shown that an increase in the anisotropy parameterξmay result in a catalysis of chiral symmetry breaking. The critical endpoint(CEP) is shifted to lower temperatures and larger quark chemical potentials asξincreases, and the impact of momentum anisotropy on the CEP temperature is almost the same as that on the quark chemical potential of the CEP. The meson masses and the associated decay widths also exhibit a significant ξ dependence. It was observed that the temperature behavior of the scaled shear viscosity η/T~3 and scaled electrical conductivity σ/T exhibited a similar dip structure, with the minima of both η/T~3 and σ/T shifting toward higher temperatures with increasing ξ. Furthermore,we demonstrated that the Seebeck coefficient S decreases when the temperature rises and its sign is positive, indicating that the dominant carriers for converting the temperature gradient to the electric field are up-quarks. The Seebeck coefficient S is significantly enhanced with a largeξfor a temperature below the critical temperature.

关键词： Heavy-ion collision Momentum anisotropy NJL model Chiral phase transition transport coefficient Quark matter

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Effect of momentum anisotropy on quark matter in the quark-meson model

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Chinese Physics C 2021年第4期45卷 279-291页

作者：张贺霞张本威 Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Institute of Quantum Matter South China Normal UniversityGuangzhou 510006China

We investigate the chiral phase structure of quark matter with spheroidal momentum-space anisotropy specified by one anisotropy parameter ξ in the 2+1 flavor quark-meson model.We find that the chiral phase diagram and the location of the critical endpoint(CEP) are significantly affected by the value of ξ.With an increase inξ,the CEP is shifted to lower temperatures and higher quark chemical potentials.In addition,the temperature of the CEP is more sensitive to the anisotropy parameter than the corresponding quark chemical potential,which is the opposite to that from the finite system volume effect.The effects of the momentum anisotropy on the thermodynamic properties and scalar(pseudoscalar) meson masses are also studied at the vanishing quark chemical potential.The numerical results reveal that an increase in ξ can hinder the restoration of chiral symmetry.We also find that shear viscosity and electrical conductivity decrease as ξ increases.However,the bulk viscosity exhibits a significant nontrivial behavior with ξ in the entire temperature domain of interest.

关键词： quark-meson model momentum anisotropy chiral symmetry transport coefficient

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Turbulence and Anomalous transport

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Journal of Modern Physics 2023年第S1期14卷 1735-1740页

作者： Bin Liang College of Science Chongqing University of Posts and Telecommunication Chongqing China

Turbulence is a thermodynamic system composed of a lot of vorticons rather than disturbance to random moving particles. The transport coefficients derived from the definition on turbulence show that the anomalous transport is a natural result of present turbulence in Tokamak plasma and provides an important theoretical reference for the design and operation of Tokamak.

关键词： Turbulence Vorticon Anomalous transport transport coefficient

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Theoretical Study on the Confluence of Debris Flow and the Main River

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四川大学学报（工程科学版） 2005年第S1期37卷 138-142页

作者： Guo, Zhixue Huang, Er Cao, Shuyou Liu, Xingnian Fang, Duo Lab. of Hydraulic and Mountain River Eng. Sichuan Univ. Chengdu 610065 China

Because of the high momentum of debris flow,when it confluences with the Main River,the water level in the upstream of the conjunction point will increase and a portion of sediment will deposit in the con- junction area.The discharge of downstream will be less then the summation discharge of main river and side channel,and the density of downstream will be difference from both the density of the fluid of main river and tributary.Based on momentum theory,and with the transport coefficient and deposit coef...

关键词： debris flow transport coefficient deposit coeffieient water rising discharge ratio density ratio

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Research on Characteristic Parameters of Lightning Discharge Channels Based on Spectrum

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Meteorological and Environmental Research 2021年第2期12卷 20-22页

作者： Caixia DONG Qinghai Higher Vocational and Technical Institute Ledu 810799China

According to the time-resolved spectra of lightning return stroke process and based on the plasma transmission theory,the evolution characteristics of the thermal conductivity and thermal diffusion coefficient of the discharge channel over time during the lightning return stroke are discussed.The radial distribution of the channel temperature in the lightning peak current phase is calculated,and the heat transfer along the radial direction of the channel is analyzed.The calculated transmission characteristic parameter values of the lightning discharge channel are all in a reasonable range.The results show that the heat transport coefficient of the lightning channel is closely related to the channel temperature and electron density.After returning to the peak current,the channel temperature slowly decreases,and the transport coefficient shows a non-linear and monotonous decay trend.The closer to the current core channel is,the greater the temperature gradient is,and the more the heat transferred radially outward is.

关键词： Lightning discharge channel Thermal conductivity transport coefficient Characteristic parameter

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Theoretical Study on the Confluence of Debris Flow and the Main River

Theoretical Study on the Confluence of Debris Flow and the M...

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The 4th Sino-German Workshop on Unsteady Sediment transport

作者： GUO Zhixue HUANG Er CAO Shuyou LIU Xingnian FANG Duo (State Key Lab.of Hydraulic and Mountain River Eng. Sichuan Univ. Chengdu 610065 China)

＜正＞Because of the high momentum of debris flow,when it confluences with the Main River,the water level in the upstream of the conjunction point will increase and a portion of sediment will deposit in the conjunction area.The discharge of downstream will be less then the summation discharge of main river and side channel,and the density of downstream will be difference from both the density of the fluid of main river and tributary.Based on momentum theory,and with the transport coefficient and deposit coefficient,the water rising and sediment depositition characteristic within the conjunction area are studied.An equation that expressed by Froude number is deduced,which can reflect the hydraulic relation and confluence characteristic in the confluence area after the confluence of main river and side channel.The equation is verified with experiment data.The result shows that,if the parameters are used correcthy,the calculation value is coincide with the one get from experiment.

关键词： debris flow transport coefficient deposit coefficient water rising discharge ratio density ratio

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