Title: The Life of QCD Fluctuations

Speaker: Prof. Navid Abbasi

    Professor Navid Abbasi received his Ph.D. in Physics from Sharif University of Technology in Tehran in 2014. He then held a five-year postdoctoral position at the Institute for Research in Fundamental Sciences (IPM, Tehran), where he also led the Quark-Gluon Plasma Theory Team during his last two years. In 2019, he joined the School of Nuclear Science and Technology at Lanzhou University as a professor. His research focuses on relativistic hydrodynamics, stochastic fluctuations, kinetic theory, and holographic approaches to non-equilibrium dynamics in quantum field theory and nuclear matter. His work has been published in journals including JHEP, Physical Review D, Physical Review Letters, Progress in Particle and Nuclear Physics, and Physics Letters B.

Abstract: 

    The search for the QCD critical point is one of the central goals of the beam-energy scan program in heavy-ion collisions. A key proposed signature is the non-Gaussian fluctuations of conserved charges, but interpreting these fluctuations requires understanding not only their equilibrium critical behavior, but also their real-time evolution during the finite lifetime of the fireball. In this talk, I will first give an overview of how fluctuation observables arise in heavy-ion collisions, why they are sensitive to critical dynamics, and how fluctuating hydrodynamics provides a bridge between hydrodynamic correlation functions and experimental observables. I will then focus on the conserved-charge diffusion sector and discuss how equal-time correlation functions can be evolved and mapped to finite-acceptance cumulants. Finally, I will briefly describe our current work on how memory in the diffusive current can modify this evolution and leave an imprint on the final fluctuation signal.

Host: A. Prof. Shan-Jin Wu

2026-06-16, 9:30AM, Bld. Houyi, Room 216.