Publications (137)426.15 Total impact

Article: The energy of a unitary Fermi gas in the normal phase including the effect of induced interaction
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ABSTRACT: In this paper, taking into account the effect of the induced interaction, we calculate the energy of ultracold Fermi gases at unitarity in the framework of nonselfconsistent Tmatrix approximation (nTMA) above the critical temperature and compare the result with the experimental data and other theoretical calculation without induced interaction. Our calculated chemical potential is higher than the experimental data, but our calculated energy obtains a good agreement with Tokyo experiment for temperature range between (Formula presented.) and (Formula presented.).Modern Physics Letters B 11/2015; DOI:10.1142/S0217984915502073 · 0.75 Impact Factor 
Article: Quantum particle confined to a thinlayer volume: Nonuniform convergence toward the curved surface
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ABSTRACT: In this paper we introduce an equation of state (EOS) of quark matter within the framework of DysonSchwinger equations (DSEs) to study the structure of compact stars. The smooth crossover from hadronic matter to quark matter in the hybrid star is studied. We compare different strategies to obtain crossover EOSs and find a new way to construct twosolarmass hybrid stars with even a relatively soft quark EOS, while earlier works show that the quark EOS should be stiff enough to support a massive hybrid star.Physical Review D 09/2015; 92(5). DOI:10.1103/PhysRevD.92.054012 · 4.64 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: A confining, symmetrypreserving, DysonSchwinger equation treatment of a vectorvector contact interaction is used to formulate Faddeev equations for the nucleon and Deltabaryon in which the kernel involves dynamical dressedquark exchange and whose solutions therefore provide momentumdependent Faddeev amplitudes. These solutions are compared with those obtained in the static approximation and with a QCDkindred formulation of the Faddeev kernel. They are also used to compute a range of nucleon properties, amongst them: the proton's sigmaterm; the large Bjorkenx values of separate ratios of unpolarised and longitudinallypolarised valence u and dquark parton distribution functions; and the proton's tensor charges, which enable one to directly determine the effect of dressedquark electric dipole moments (EDMs) on neutron and proton EDMs.  [Show abstract] [Hide abstract]
ABSTRACT: We investigate the dynamical chiral symmetry breaking and its restoration at finite density and temperature within the twoflavor NambuJonaLasinio model, and mainly focus on the critical behaviors near the critical end point (CEP) and tricritical point (TCP) of quantum chromodynamics. The multisolution region of the Nambu and Wigner ones is determined in the phase diagram for the massive and massless current quark, respectively. We use the various susceptibilities to locate the CEP/TCP and then extract the critical exponents near them. Our calculations reveal that the various susceptibilities share the same critical behaviors for the physical current quark mass, while they show different features in the chiral limit.European Physical Journal C 08/2015; 75(10). DOI:10.1140/epjc/s1005201537202 · 5.08 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Within the framework of DysonSchwinger equations (DSEs), we discuss the equation of state (EOS) and quark number densities of 2+1 flavors, that is to say, $u$, $d$, and $s$ quarks. The chemical equilibrium and electric charge neutrality conditions are used to constrain the chemical potential of different quarks. The EOS in the cases of 2 flavors and 2+1 flavors are discussed, and the quark number densities, the pressure, and energy density per baryon are also studied. The results show that there is a critical chemical potential for each flavor of quark, at which the quark number density turns to nonzero from 0; and furthermore, the system with 2+1 flavors of quarks is more stable than that with 2 flavors in the system. These discussion may provide some useful information to some research fields, such as the studies related to the QCD phase transitions or compact stars.  [Show abstract] [Hide abstract]
ABSTRACT: In the mean field approximation of (2+1)flavor NambuJonaLasinio model, we strictly derive several sets of coupled equations for the chiral susceptibility, the quark number susceptibility, etc. at finite temperature and quark chemical potential. The critical exponents of these susceptibilities in the vicinity of the QCD critical end point (CEP) are presented in SU(2) and SU(3) cases, respectively. It is found that these various susceptibilities share almost the same critical behavior near the CEP. The comparisons between the critical exponents for the order parameters and the theoretical predictions are also included.  [Show abstract] [Hide abstract]
ABSTRACT: Within the framework of DysonSchwinger equations (DSEs), we discuss the chiral phase transition of QCD with a chiral chemical potential $\mu_5$ as an additional scale. We focus especially on the issues related to the widely accepted as well as interested critical end point (CEP). With the help of a scalar susceptibility, we find that there might be no CEP$_5$ in the $T\mu_5$ plane, and the phase transition in the $T\mu_5$ plane might be totally crossover when $\mu<50$ MeV, which has apparent consistency with the Lattice QCD calculation. Our study may also provide some useful hints to some other studies related to $\mu_5$.Physical Review D 05/2015; 91(5). DOI:10.1103/PhysRevD.91.056003 · 4.64 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We employ a continuum approach to the three valencequark boundstate problem in relativistic quantum field theory to predict a range of properties of the proton's radial excitation and thereby unify them with those of numerous other hadrons. Our analysis indicates that the nucleon's first radial excitation is the Roper resonance. It consists of a core of three dressedquarks, which expresses its valencequark content and whose charge radius is 80% larger than the proton analogue. That core is complemented by a meson cloud, which reduces the observed Roper mass by roughly 20%. The meson cloud materially affects longwavelength characteristics of the Roper electroproduction amplitudes but the quark core is revealed to probes with $Q^2 \gtrsim 3 m_N^2$.Physical Review Letters 04/2015; 115(17). DOI:10.1103/PhysRevLett.115.171801 · 7.51 Impact Factor 
Article: Progress in vacuum susceptibilities and their applications to the chiral phase transition of QCD
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ABSTRACT: The QCD vacuum condensates and various vacuum susceptibilities are all important parameters which characterize the nonperturbative properties of the QCD vacuum. In the QCD sum rules external field formula, various QCD vacuum susceptibilities play important roles in determining the properties of hadrons. In this paper, we review the recent progress in studies of vacuum susceptibilities together with their applications to the chiral phase transition of QCD. The results of the tensor, the vector, the axialvector, the scalar, and the pseudoscalar vacuum susceptibilities are shown in detail in the framework of DysonSchwinger equations.Annals of Physics 04/2015; 358. DOI:10.1016/j.aop.2015.03.025 · 2.10 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We compute all kaon and pion parton distribution amplitudes (PDAs) to twistthree and find that only the pseudotensor PDA can reasonably be approximated by its conformal limit expression. At terrestrially accessible energy scales, the twisttwo and pseudoscalar twistthree PDAs differ significantly from those functions commonly associated with their forms in QCD's conformal limit. In all amplitudes studied, SU(3) flavoursymmetry breaking is typically a 13% effect. This scale is determined by nonperturbative dynamics; namely, the currentquarkmass dependence of dynamical chiral symmetry breaking. The heavierquark is favoured by this distortion, for example, support is shifted to the squark in the negative kaon. It appears, therefore, that at energy scales accessible with existing and foreseeable facilities, one may obtain reliable expectations for experimental outcomes by using these "strongly dressed" PDAs in formulae for hard exclusive processes. Following this procedure, any discrepancies between experiment and theory will be significantly smaller than those produced by using the conformallimit PDAs. Moreover, the magnitude of any disagreement will either be a better estimate of higherorder, highertwist effects or provide more realistic constraints on the Standard Model.Physical Review D 04/2015; 92(1). DOI:10.1103/PhysRevD.92.014035 · 4.64 Impact Factor 
Article: Dynamical chiral symmetry breaking in the NJL model with a constant external magnetic field
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ABSTRACT: In this paper we develop a new method that is different from Schwinger proper time method to deduce the fermion propagator with a constant external magnetic field. In the NJL model, we use this method to find out the gap equation at zero and nonzero temperature, and give the numerical results and phase diagram between magnetic field and temperature. Beside these, we also introduce current mass to study the susceptibilities, because there is a new parameter (the strength of external magnetic field) in this problem, corresponding this new parameter, we have defined a new susceptibility $\chi_B$ to compare with the other two susceptibilities $\chi_c$ (chiral susceptibility) and $\chi_T$ (thermal susceptibility), and all of the three susceptibilities show than when current mass is not zero, the phase transition is a crossover, while for comparison, in the chiral limit, the susceptibilities show a second order phase transition. At last, we give out the critical coefficients of different susceptibilities in the chiral limit.Physical Review D 03/2015; 91(3). DOI:10.1103/PhysRevD.91.036006 · 4.64 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We clearly refine a fundamental framework for the thinlayer quantization scheme. Further, we definitively clarify a performing sequence in the thinlayer quantization process. The limit $q_3\to 0$ ($q_3$ denotes the variable perpendicular to the curved surface) must be performed after calculating all curvilinear coordinate derivatives. In the general form, a canonical action integral, the limit $d\to 0$ ($d$ is the thickness of the curved surface) has to be calculated after performing all curvilinear coordinate integrations. In complete accordance with the sequence, in the presence of an electromagnetic field, for a charged particle constrained on a spatially curved surface the Lorentz gauge and the Schr\"{o}dinger equation cannot be decoupled from the mean curvature of the surface simultaneously, except $A^3=0$ ($A^3$ is a contravariant component along the direction perpendicular to the curved surface of the electromagnetic field vector potential $\vec{A}$) with a certain gauge transformation, and the canonical action integral does not show convenience for the thinlayer quantization scheme. Additionally, we derive the modifications induced by the thickness of the surface to the geometric potential and the kinetic operator.  [Show abstract] [Hide abstract]
ABSTRACT: In this paper we utilize our improved quasiparticle model to obtain the equation of state (EOS) and use it as an input to the TolmanOppenheimerVolkoff (TOV) equation to get the massradii relation of a pure quark star. We discuss the relation between structures of quark stars and the parameters in the EOS and get a maximum mass of quark star over two solar mass. To compare the result with recent observation, we also calculate the structure of a hybrid star and consider the influence of rotation. Finally, the hadronquark phase transition in the interior of neutron stars and how much energy will be released when a neutron star bursts into a quark star are discussed.Physical Review D 02/2015; 91(3). DOI:10.1103/PhysRevD.91.034018 · 4.64 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We calculate the quark number susceptibility (QNS) around the chiral critical end point (CEP). The CEP is found to be located at (μc, Tc) = (80 MeV, 148 MeV) where μc and Tc are the critical chemical potential and temperature, respectively. The QNS is found to have the highest and sharpest peak at the CEP. It is also found that, when the chemical potential μ is in the range of 60 MeV≤ μ ≤ 110 MeV, the QNS near the transition temperature is larger than the free field result, which indicates that the spacelike damping mode dominates the degree of freedom of motion near the CEP.Chinese Physics Letters 02/2015; 32(2):021201. DOI:10.1088/0256307X/32/2/021201 · 0.95 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The effect of chiral imbalance on the QCD phase structure is studied in a framework of Dyson\char21{}Schwinger equations. It is found that the chiral phase transition is always a crossover in the $T$${}{$\mu${}}_{5}$ plane when $$\mu${}$ is 0 MeV or small values. The trail of the critical endpoints (CEPs) along with the variation of the chiral chemical potential is given. We find that the effect of ${$\mu${}}_{5}$ is somewhat different from the existing chiral model calculations; namely, the CEP first moves roughly along the phase boundary of $T$${}$\mu${}$ plane in a smaller $$\mu${}$ direction, as in the chiral model calculations, but turns in the opposite direction to move away from the small chemical potential region, which has never been observed before. In addition, we also discuss the possibility of whether the study at finite temperature and chiral chemical potential can provide some useful information for the detection of the CEP at finite temperature and baryon chemical potential, since the former can be calculated in lattice QCD without the sign problem.Physical Review D 02/2015; 91(3). DOI:10.1103/PhysRevD.91.034017 · 4.64 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The studies of DysonSchwinger Equations (DSEs) provide us with insights into nonperturbative phenomenon of quantum field theory. However, DSEs are essentially an infinite set of coupled Green's functions, it's necessary to decouple parts of the equations which are thought of major physical importance to make the solution of these equations possible. Although the results are modeldependent, no qualitative deviations from exact solutions are expected with properly chosen truncation scheme. In this article, a globally convergent numerical method for the solution of the DSEs of QED$_3$ in Euclidean space is presented. This method can be adapted for more complex problems, however, it also shows its limitations when adopted in problems such as the searching for Wigner solutions.  [Show abstract] [Hide abstract]
ABSTRACT: Since the baryonnumber susceptibilities are correlated with the cumulant of baryonnumber fluctuations in experiments, we do calculations of the susceptibilities and compare them with the experimental fluctuation data under the framework of the DysonSchwinger equations (DSEs) approach. We compare our results with lattice QCD and experimental data at RHIC. The fitness of the results indicates that under the framework of DSEs, we can deal with the problems of heavy ion collisions properly.Physical Review D 12/2014; 90(11). DOI:10.1103/PhysRevD.90.114031 · 4.64 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Introducing constant background fields into the noncommutative gauge theory, we first obtain a Hermitian fermion Lagrangian which involves a Lorentz violation term, then we generalize it to a new deformed canonical noncommutation relations for fermion field. Massless neutrino oscillation in the deformed canonical noncommutation relations is analyzed. The restriction of the noncommutative coefficients is also discussed. By comparing with the existing experimental data of conventional neutrino oscillations, the order of noncommutative deformed coefficients is given from different ways.Physical Review D 12/2014; 91(3). DOI:10.1103/PhysRevD.91.036009 · 4.64 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We derive the curvature induced quantummechanical potential of a neutral spinless particle constrained to move on a surface of revolution. Using the thinlayer quantization scheme, we decompose the tangent component of the Schr\"odinger equation from the transverse component. The tangent Schr\"odinger equation is separated into angular and axial direction in cylindrical coordinate. The exactly solvable model with the shape of truncated cone is investigated and its geometrical induced states are given analytically. With hard wall boundary condition, we find that energy levels and energy differences decrease monotonically with raising the height and generatrix slope of the geometry. Moreover, particles possessing higher kinetic energy tends to occupy the place with greater curvature. These results do good favor to concerned nanostructure experiment.
Publication Stats
1k  Citations  
426.15  Total Impact Points  
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Institutions

19942015

Nanjing University
 Department of Physics
Nanching, Jiangsu Sheng, China


2014

Anyang Normal University
Changte, Henan Sheng, China


2013

National Space Science
Peping, Beijing, China


2011

Chongqing Jiaotong University
Ch’ungch’ingshih, Chongqing Shi, China


2010

Government of the People's Republic of China
Peping, Beijing, China


19982002

Academia Sinica
T’aipei, Taipei, Taiwan 
China Institute of Atomic Energy
Peping, Beijing, China
