We review the derivation of the fluid-dynamical equations of motion from kinetic theory. Applying this method we derive multicomponent relativistic second-order dissipative fluid dynamics from the Boltzmann equations for a reactive mixture of NS particle species with NQ intrinsic quantum numbers (e.g. electric charge, baryon number, and strangeness). The resulting transient fluid-dynamical...
Two formulations of relativistic hydrodynamics of particles with spin 1/2 are compared. The first approach, dubbed the canonical one, uses expressions for the energy-momentum and spin tensors that have properties that follow a direct application of Noether's theorem, which yields a totally antisymmetric spin tensor. The other one is based on a simplified form of the spin tensor and is commonly...
We argue that a detailed analysis of the spin alignment of vector mesons can serve as a probe of some aspects of spin dynamics in the vortical fluid for which there have been quite a few theoretical developments but
relatively little phenomenology: The degree of relaxation between vorticity and parton spin polarization, and the degree of coherence of the hadron wavefunction at freeze-out. We...
Relativistic hydrodynamics is surprisingly predictive, even in the presence of large gradients and large deviations from equilibrium. In some of its incarnations, the method of moments can be used to justify the hydrodynamic behavior of a relativistic gas. However, it can’t be directly generalized. If long range interactions are introduced through a medium-dependent mass or a semi-classical...
We discuss the quantum fluctuations of energy in subsystems of hot relativistic gas for both scalar and spin half particles. For small subsystem sizes, we find a substantial increase of fluctuations compared to those known from standard thermodynamic considerations. However, if the size of the subsystem is sufficiently large, we reproduce the result for energy fluctuations in the canonical...
In this talk I will explore several theoretical issues in applying the S-matrix formulation of statistical mechanics to coupled channel scattering, e.g. dealing with inelasticity, treating overlapping resonances, and studying the influences from dynamical structures like poles and roots on thermal observables. As an application, I will discuss a coupled-channel model describing the S=-1...
In this talk, I will present the outcome of our study on quark clusters at finite temperature and baryochemical potential. The properties of hadronic clusters are derived using generalized Beth-Uhlenbeck formulas with underlying quark degrees of freedom following from the PNJL model. This allows us to describe within a unified approach the transition from a hadronic phase where quarks are...
We study the production of charm quarks in a hot QCD medium composed of the dynamical quarks and gluons, dressed by the effective temperature-dependent masses. The temperature dependence is incorporated through the coupling deduced from the lattice QCD equation of state for $N_f=2+1$ [1]. For the time evolution of the QGP, we employ the hydrodynamic results [2] which involve the shear...
We discuss the screening of a four-quark interaction by the ring diagram and its back-reaction on the quark gap equation in an effective chiral quark model. In consequence, a medium-dependent coupling is derived. This naturally reduces the chiral transition temperature in a class of models. It is also capable of generating the inverse magnetic catalysis at finite temperatures and magnetic...
Following the idea that a stable sexaquark state with quark content (uuddss) would have gone unnoticed by experiments so far and that such a particle would be a good dark matter candidate, we investigate the possible role of a stable sexaquark in the physics of compact stars given the stringent constraints on the equation of state that stem from observations of high mass pulsars and GW170817...
