QCD at finite temperature and density within the fRG approach:an overview  

作　　者：Wei-jie Fu 

机构地区：[1]School of Physics,Dalian University of Technology,Dalian,116024,China

出　　处：《Communications in Theoretical Physics》2022年第9期299-355,共57页理论物理通讯（英文版）

基　　金：supported by the National Natural Science Foundation of China under Grant No.12175030

摘　　要：In this paper,we present an overview on recent progress in studies of QCD at finite temperature and densities within the functional renormalization group(fRG)approach.The f RG is a nonperturbative continuum field approach,in which quantum,thermal and density fluctuations are integrated successively with the evolution of the renormalization group(RG)scale.The f RG results for the QCD phase structure and the location of the critical end point(CEP),the QCD equation of state(EoS),the magnetic EoS,baryon number fluctuations confronted with recent experimental measurements,various critical exponents,spectral functions in the critical region,the dynamical critical exponent,etc,are presented.Recent estimates of the location of the CEP from first-principle QCD calculations within f RG and Dyson-Schwinger equations,which pass through lattice benchmark tests at small baryon chemical potentials,converge in a rather small region at baryon chemical potentials of about 600 MeV.A region of inhomogeneous instability indicated by a negative wave function renormalization is found withμ_(B)■420 MeV.It is found that the non-monotonic dependence of the kurtosis of the net-proton number distributions on the beam collision energy observed in experiments could arise from the increasingly sharp crossover in the regime of low collision energy.

关 键 词：QCD phase transition chiral phase transition QCD phase diagram functional renormalization group 

分 类 号：O572.243[理学—粒子物理与原子核物理]