Speaker
Description
The observation of global and local spin polarization in heavy-ion collisions is explained as being induced by thermodynamics gradients of the QGP at local thermal equilibrium, such as the thermal vorticity and the thermal shear. However, since not all the features of the measurements can be well reproduced by the models, the assumption that the spin degrees of freedom of the QGP are equilibrated can be questioned. In this talk, I will derive the dissipative, out-of-equilibrium contributions to spin polarization at first order in gradients using the Zubarev method for spin hydrodynamics. I will prove that the thermal shear can not give rise to dissipative corrections to spin polarization. I will derive momentum dependent kubo formulas that gives the intensity of each contributions and that can be evaluated for any underlying microscopic theory. At the end I will discuss consequences on the interpretation of the measurements.
| Category | Theory |
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