Conveners
Section 9: 分会场-1, Session 2
- 川 刘 ()
At large isospin chemical potential $\mu_I$ and low temperature, QCD undergoes a second-order transition to a Bose-Einstein condensate of charged pions, whose order is encoded in the non-analytic $\mu_I$-dependence of the pressure and of the isospin density derived from it. Including dynamical photons is expected, on general grounds, to drive this transition first order. Since unequal quark...
Strong magnetic fields produced in relativistic heavy-ion collisions can modify conserved-charge fluctuations and their associated chemical potentials. The Ru and Zr isobars share the same mass number, $A=96$, but have different charge-to-baryon ratios, making Ru+Ru and Zr+Zr collisions a controlled setting for isolating isospin effects. In this talk, we will present first-principles,...
We propose a universality-based reconstruction of the QCD chiral crossover line from Lee--Yang edge singularities in the complex baryon chemical potential plane[1]. The framework maps lattice-extracted complex Lee--Yang-zero estimates, treated as proxies for edge singularities, to the universal chiral Lee--Yang edge and thereby determines the $\mu_B$ dependence of both the chiral critical line...
Understanding how external magnetic fields affect chiral and singlet $U(1)_A$ symmetry breaking is an important question in QCD under extreme conditions. In a pure magnetic background, the unequal electric charges of the light quarks explicitly reduce the non-singlet flavor symmetry, making it necessary to identify the appropriate neutral mesonic partner channels. We clarify the neutral-sector...
The chiral anomaly underlies many processes, including the two-photon decay of the neutral pion and the axion-photon coupling, and fixes their leading-order contributions to a constant independent of QCD dynamics. However, traditional lattice QCD methods compute the complete amplitude, making percent-level precision demanding. We show that, by applying the anomalous Ward identity (AWI), the...
An infinite-heavy quark system can clearly be divided into two subsystems: one consisting of two infinitely heavy quarks and the other being the sea gluon and sea quark subsystem, allowing us to define the reduced density matrix and entanglement entropy. We calculate the reduced density matrix defined in color space under the Coulomb gauge condition on lattice dynamical configurations and find...
