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Linear Chemical Potential Dependence of Two-Quark Condensate

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Communications in Theoretical Physics 2006年第5期46卷 901-904页

作者： zong Hong-shi Department of Physics Nanjing University Nanjing 210093 China Joint Center for Particle Nuclear Physics and Cosmology Nanjing 210093 China

By differentiating the inverse dressed quark propagator at finite chemical potential μ with respect to μ, the linear response of the dressed quark propagato r to the chemical potential can be obtained, From this we extract a modelindependent formula for the linear chemical potential dependence of the in-medium two-quark condensate and show by two independent methods （explicit calculation and Lorentz covariance arguments） that the first-order contribution in μ to the in-medium two-quark condensate vanishes identically. Therefore if one wants to study the in-medium two-quark condensate one should expand to at/east the second order in the chemical potential μ.

关键词： QCD vacuum two-quark condensate finite chemical potential

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The Mixed Quark-Gluon Condensate from the Global Color Symmetry Model

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Communications in Theoretical Physics 2002年第8期38卷 205-208页

作者： zong Hong-shi Department of Physics Nanjing University Nanjing 210093 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China Department of Physics Nanjing Normal University Nanjing 210097 China Department of Physics Sichuan University Chengdu 610064 China Institute of Theoretical Physics Academia Sinica P.O. Box 2735 Beijing 100080 China

The mixed quark-gluon condensate from the global color symmetry model is derived. It is shown that themixed quark-gluon condensate depends explicitly on the gluon propagator. This interesting feature may be regarded asan additional constraint on the model of gluon propagator. The values of the mixed quark-gluon condensate from someansatz for the gluon propagator are compared with those determined from QCD sum rules.

关键词： nonperturbative methods in QCD global color symmetry model

Modified Approach for Calculating Four-Quark Condensates

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Communications in Theoretical Physics 2007年第2期47卷 293-298页

作者： zong Hong-shi SUN Wei-Min Department of Physics Nanjing University Nanjing 210093 China Joint Center for Particle Nuclear Physics and Cosmology Nanjing 210093 China CCAST （World Laboratory） P.O. Box 8730 Beijing 100080 China

By differentiating the dressed quark propagator with respect to a variable background field, the linear response of the dressed quark propagator in the presence of the background field can be obtained. From this general method, using the vector background tield as an illustration, we extract a general formula for the four-quark condensate （0： q（0）γμq（0）q（0）γμq（0）：｜0）. This formula contains the corresponding fully dressed vector vertex. We use this formula to analyze the factorization problem of the four-quark condensate and show that in the bare vertex approximation factorization holds exactly.

关键词： QCD vacuum four-quark condensates Dyson-Schwinger approach

Calculation of Partition Function of QCD at Finite Chemical Potential

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Communications in Theoretical Physics 2008年第2期49卷 435-438页

作者： SUN Wei-Min zong Hong-shi Department of Physics Nanjing University Nanjing 210093 China joint Center for Particle Nuclear Physics and Cosmology Nanjing 210093 China

In equilibrium statistical field theory, the partition function has fundamental importance. In this paper we propose a direct and general method for calculating the partition function and equation of state of QCD at finite chemical potential. It is found that the partition function is totally determined by the dressed quark propagator at finite chemical potential up to a multiplicative constant. From this a criterion for the phase transition between the Nambu and the Wigner phases is obtained. This general method is applied to two specific cases： the free quark theory and QCD with a model dressed quark propagator having confinement features. In the first case, the standard Fermi distribution at T = 0 is reproduced. In the second case, we apply the conclusion in previous works to obtain the dressed quark propagator at finite chemical potential and find the unphysical result that the baryon number density vanishes for all values of chemical potential. The reason for this result is discussed.

关键词： partition function of QCD phase transition

Quadratic Yukawa coupling and matrix Yukawa coupling in the large N expansion

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Chinese Science Bulletin 2014年第5期59卷 484-491页

作者： Song shi Wei-Min Sun Hong-shi zong Department of Physics Nanjing University State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Science Joint Center for Particle Nuclear Physics and Cosmology

In this article,we study three types of new Yukawa couplings(the boson field is coupled to the fermion field).Two of them are quadratic Yukawa couplings(the boson field is in the form of a vector),and the other one is the matrix Yukawa coupling(the boson field is in the form of a matrix).Based on the above three couplings,we introduce the Higgs mechanism,and find out the properties of the generated mass for the fermions with multiple *** the matrix boson,we introduce its coupling with non-Abelian gauge *** turns out that the generated mass of the gauge field through the Higgs mechanism is *** the large N limit,using the method of auxiliary field,we study the dynamical behaviors of the quadratic Yukawa couplings,including the poles of some dressed propagators.

关键词：场耦合矩阵希格斯机制玻色子场费米子场动力学行为联轴器规范场

Disk Thicknesses and Some Parameters of 108 Non-Edge-On Spiral Galaxies

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Chinese Journal of Astronomy and Astrophysics 2007年第4期7卷 579-589页

作者： Tao Hu Qiu-He Peng Hong-shi zong Department of Astronomy Nanjing University Nanjing 210093 Department of Physics Nanjing University Nanjing 210093 Department of Physics and Electronics Zhangzhou Normal University Zhangzhou 363000 Joint Astrophysics Center of Chinese Academy of Sciences-Peking University Beijing 100871 Open Laboratory of Cosmic Ray and High Energy Astrophysics Chinese Academy of Sciences Beijing 100039

We present disk thicknesses, some other parameters and their statistics of 108 nonedge-on spiral galaxies. The method for determining the disk thickness is based on solving Poisson＇s equation for a disturbance of matter density in three-dimensional spiral galaxies. From the spiral arms found we could obtain the pitch angles, the inclination of the galactic disk, and the position of the innermost point （the forbidden region with radius r0 to the galactic center） of the spiral arm, and finally the thickness.

关键词： galaxy: disk- galaxies: fundamental parameters- galaxies: spiral - galaxies:structure

Chiral phase transition and equation of state in chiral imbalance

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Chinese Physics C 2021年第8期45卷 145-152页

作者： Qing-Wu Wang Chao shi Hong-shi zong College of Physics Sichuan UniversityChengdu 610064China Department of nuclear science and technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Physics Nanjing UniversityNanjing 210093China Department of Physics Anhui Normal UniversityWuhuAnhui 241000China Nanjing Institute of Proton Source Technology Nanjing 210046China

The chiral phase transition and equation of state are studied within a novel self-consistent mean-field approximation of the two-flavor Nambu-Jona-Lasinio *** this newly developed model,modifications to the chemical μand chiral chemical μ5 potentials are naturally included by introducing vector and axial-vector channels from Fierz-transformed Lagrangian to the standard *** the proper-time scheme,the chiral phase transition is a crossover in the T-μ ***,when μ5 is incorporated,our study demonstrates that a first order phase transition may ***,the chiral imbalance will soften the equation of state of quark *** mass-radius relationship and tidal deformability of quark stars are *** maximum mass and radius decrease as μ5 *** study also indicates that the vector and axial-vector channels exhibit an opposite influence on the equation of state.

关键词： chiral imbalance critical end point tidal deformability

Transverse Ward-Takahashi identities and full vertex functions in different representations of QED3

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Chinese Physics C 2020年第7期44卷 55-64页

作者： Cui-Bai Luo Hong-shi zong Department of Physics Anhui Normal UniversityAnhui 241002China Department of Physics Nanjing UniversityNanjing 210093China Nanjing Proton Source Research and Design Center Nanjing 210093China

We derive the transverse Ward-Takahashi identities(WTI)of N-dimensional quantum electrodynamics by means of the canonical quantization method and the path integration method,and subsequently attempt to prove that QED3 is solvable based on the transverse and longitudinal WTI,indicating that the full vector and tensor vertices functions can be expressed in terms of the fermion propagators in ***,we discuss the effect of differentγmatrix representations on the full vertex function.

关键词： Ward-Takahashi identities vertex functions QED3

Contribution of myeloid-derived suppressor cells to tumor-induced immune suppression,angiogenesis,invasion and metastasis

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Journal of Genetics and Genomics 2010年第7期37卷 423-430页

作者： Xian-zong Ye shi-Cang Yu Xiu-Wu Bian Institute of Pathology and Southwest Cancer Center Southwest Hospital Third Military Medical University Chongqing 400038 China

Growing evidence suggests that myeloid-derived suppressor cells （MDSCs）,which have been named ＂immature myeloid cells＂ or ＂myeloid suppressor cells＂（MSCs）,play a critical role during the progression of cancer in tumor-bearing mice and cancer *** their name implies,these cells are derived from bone marrow and have a tremendous potential to suppress immune *** studies indicated that these cells also have a crucial role in tumor *** can directly incorporate into tumor *** secret many pro-angiogenic factors as *** addition,they play an essential role in cancer invasion and metastasis through inducing the production of matrix metalloproteinases （MMPs）,chemoattractants and creating a pre-metastatic *** evidence supports the idea that cancer stem cells （CSCs） are responsible for tumorigenesis,resistance to therapies,invasion and ***,we hypothesize that CSCs may ＂hijack＂ MDSCs for use as alternative niche cells,leading to the maintenance of stemness and enhanced chemo-and radio-therapy *** countermeasure that directly targets to MDSCs may be useful for against angiogenesis and preventing cancer from invasion and ***,the study of MDSCs is important to understand tumor progression and to enhance the therapeutic efficacy against cancer.

关键词： myeloid-derived suppressor cells immune suppression angiogenesis invasion metastasis