Conveners
Parallel session 24: New theoretical developments II
- Owe Philipsen (Goethe University Frankfurt)
Hydrodynamic attractors are a universal phenomenon of strongly interacting systems that describe the hydrodynamic-like evolution far from local equilibrium. The rapid hydrodynamization of the Quark-Gluon Plasma is behind the remarkable success of hydrodynamic models of high-energy nuclear collisions. Until now, hydrodynamic attractors have been studied only in monotonically expanding systems,...
Finite density lattice QCD usually relies on extrapolations in baryon
chemical potential ($\mu_B$), be it Taylor expansion, T' expansion or
analytical continuation. However, their range of validity is difficult to
control. In the canonical formulation, the baryon density is the
parameter of the system, not $\mu_B$.
Here we demonstrate that we can access finite density QCD in the...
Thermal fluctuations are a fundamental feature of dissipative systems that are essential for understanding physics near the expected critical point of QCD and in small systems. Such fluctuations can be modeled by including a stochastic source in the standard hydrodynamics equations. However, when this is done naively strange features can appear such as negative self-correlation functions...
We develop a comprehensive analytic framework for jet quenching in QCD media, based on a medium-induced parton cascade sourced by collinear virtual splittings. We show that the energy flow out of the jet cone, driven by turbulent gluon cascades, is governed by a non-linear rate equation that resums gluon splittings at arbitrary angles and is enhanced by the medium length, L. The solution of...
The effective kinetic theory of QCD provides a possible picture of various non-equilibrium processes in heavy- and light-ion collisions. While there have been substantial advances in simulating the EKT in simple systems with enhanced symmetry, eventually, event-by-event simulations will be required to test this physical picture. As of now, these simulations are prohibitively expensive due to...
We describe a unique formulation of relativistic viscous fluid dynamics based on the density frame. The equations of motion are strictly first order in time and have no non-hydrodynamic modes. The only fields are the energy and momentum densities $T^{0\mu}$ and the only parameters are the equilibrium equation state and the shear and bulk viscosities. We compare numerical results to QCD...
We use a novel real-time formulation of the functional renormalization group (FRG), as a valuable tool complementary to classical-statistical simulation, for dynamical systems with reversible mode couplings to study Model H, the conjectured dynamic universality class of the QCD critical point. We emphasize the structural similarities with Model G, conjectured to be the dynamic universality...
