Conveners
Session 5
- Francesco Giacosa (Jan Kochanowski University)
The concept of spin hydrodynamics is introduced and the newest developments in this field are reviewed.
We develop a new form of the Wigner function for a relativistic gas of spin-1/2 particles in local equilibrium [1]. This new expression resolves the previously encountered issue with the normalization of the mean spin polarization and also leads to the generalized thermodynamic relations for perfect spin hydrodynamics, agreeing therefore with kinetic theory with classical spin treatment....
We compare two recently developed frameworks of perfect spin hydrodynamics for spin-1/2 particles, based respectively on classical kinetic theory and the Wigner function. We show that the conserved currents in both approaches have the same form at each order of the expansion in the components of the spin polarization tensor ω. The only difference is a relative multiplicative factor, which is...
We analyze the effect of using the Fermi–Dirac statistics, rather than its Boltzmann approxima-
tion, in numerical simulations of perfect spin hydrodynamics of particles with spin 1/2. The system
considered is a one-dimensional boost-invariant expansion with corrections to the energy–momentum
tensor and the baryon current that are second order in the spin polarization tensor ω. The...
At present, our understanding of the non-equilibrium aspects of a relativistic spin fluid is derived from the study of Wigner function coupled with the semiclassical expansion. In our work, we present an exact computation (up to quantum loop corrections) of the Wigner functions for quarks in a field of oscillating pion condensate. The oscillating pion condensate enters the equation of motion...
In this talk I present a Bayesian global analysis of a (2+1)-d viscous hydrodynamics model with event-by-event EKRT initial state describing simultaneously four collision systems: Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV, Pb+Pb collisions at 2.76 TeV and 5.02 TeV, and Xe+Xe collisions at 5.44 TeV. To make the analysis computationally feasible, two layers of model emulation are utilized:...
Lattice QCD results for the magnetic susceptibility of the medium just below the cross-over temperature are difficult to be reproduced by the available hadronic models. In particular, the widely used hadron resonance gas, remarkably successful to describe numerous other lattice results, is substantially too strong diamagnetic as compared to the data, at all temperatures available in the...
In non-central heavy-ion collisions, the presence of strong electromagnetic (EM) fields causes charged hadrons to experience different deflections along and opposite to the impact parameter direction. This results in a splitting of the directed flow between oppositely charged hadrons. Since the strength of the EM field varies with both centrality and system size, studying the directed flow...
