Stochastic charge transport in relativistic hydrodynamics

by Baochi Fu (Bielefeld University)

Saturday 11 Oct 2025, 10:30 → 11:30 Asia/Shanghai

M423

In heavy-ion collision experiments, fluctuations of conserved charges serve as key observables for probing the QCD phase structure and searching for the critical point. These quantities are sensitive to the correlation length and are directly related to the susceptibilities computed from first principles Lattice QCD calculations. However, a fully dynamical description using stochastic hydrodynamics remains challenging due to numerical instabilities and high computational costs. 

In this work, we employ a linearized stochastic hydrodynamic approach that significantly reduces computational demands while maintaining high accuracy. We implement this linearized charge evolution in the 3+1D viscous hydrodynamic framework MUSIC with Cooper–Frye freeze-out, and find excellent agreement with analytical solutions across a variety of equations of state and transport coefficients. Furthermore, we extend this framework to simultaneously evolve the three conserved charges—baryon number (B), electric charge (Q), and strangeness (S)—and observe significant mixed-correlation signals

Biography: 
Baochi Fu is a postdoctoral researcher in the physics department at Bielefeld University since 2023. He received his B.S. degree in Physics from Nankai University and his Ph.D. from Peking University. His research focuses on relativistic hydrodynamics and its applications in heavy-ion collisions, including topics such as anisotropic flow, spin polarization, and fluctuating hydrodynamics.