2026/08/12(Wed) 10:30 -12:00 五樓第一會議室 5F, 1st Meeting Room
Title
Modeling QCD under extreme conditions in relativistic heavy-ion collisions
Speaker
尼科班瓦博士 (本院物理研究所) Dr. Nicholas Benoit (Institute of Physics, Academia Sinica)Abstract
For ~20 years, relativistic heavy-ion collisions have studied the extreme state of matter called quark-gluon plasma (QGP). This has been driven by precise experiment results and advanced theory models. Yet some transport properties of the near-equilibrium QGP and the initial non-equilibrium stage remain unknown. We address some of those gaps with our two models.
Our first model connects experiment observables to QGP's conductive transport. That transport occurs because QGP is a strongly interacting fluid in an electromagnetic background. To model such a system, we have employed relativistic resistive magneto-hydrodynamics (RRMHD). Our RRMHD model predicts a small, non-zero conductivity for QGP changes the observed flow of charged hadrons and photons.
Our second model shows that non-perturbatively produced quarks carry information about the initial non-equilibrium system. Non-equilibrium occurs right after the collision liberates numerous gluons that form a dense, over occupied state. We model that as classical Yang-Mills fields (glasma). Calculations show those fields are strong enough to non-perturbatively produce particles by modifying the local vacuum (Schwinger mechanism). We combine those ideas into a real-time lattice simulation, i.e., colored particle-in-cell (cPIC) model. Our model finds imprints of the non-equilibrium stage in correlations of conserved charges and quark spin-polarization fluctuations.
Together, our models show how heavy-ion collisions still reveal interesting physics after 20 years: both in QGP's conductivity and in the imprints left by its non-equilibrium birth. This talk is based on our works 2411.01406 [hep-ph], 2502.04611 [nucl-th], 2606.14166 [hep-ph], and currently unpublished work.
Language
演講語言 (Language): in English