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Spin-thermal shear coupling in a relativistic fluid
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We show that spin polarization of a fermion in a relativistic fluid at local thermodynamic equilibrium can be generated by the symmetric derivative of the four-temperature vector, defined as thermal shear. As a consequence, besides vorticity, acceleration and temperature gradient, also the shear tensor contributes to the polarization of particles in a fluid. This contribution to the spin polarization vector, which is entirely non-dissipative, adds to the well known term proportional to thermal vorticity and may thus have important consequences for the solution of the local polarization puzzles observed in relativistic heavy ion collisions.
Forward citations
Cited by 6 Pith papers
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An improved formula for Wigner function and spin polarization in a decoupling relativistic fluid at local thermodynamic equilibrium
A new derivation gives the spin polarization of emitted fermions in terms of thermal vorticity and shear evaluated on the decoupling surface, with the shear term expressed through the local hypersurface normal rather ...
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Local Spin Polarization in Anisotropic Gubser Flow: Suppression Mechanism and Formulation Dependence
In an anisotropic Gubser flow, the longitudinal spin polarization's sign depends on which shear formulation is used, and two popular formulations show exact or near-exact cancellation between vorticity and shear contr...
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Is nucleon spin thermalized in intermediate-energy heavy-ion collisions?
In Au+Au collisions at 50-150 AMeV, spin-thermalized formulas predict about twice the nucleon spin polarization that a spin-orbit transport model produces, indicating spin is not fully thermalized.
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Tensor spin polarization induced by curved freeze-out hypersurface
The curvature of the freeze-out hypersurface induces a tensor spin polarization of vector mesons at leading gradient order, with predicted phi-meson spin alignment around -10^-4 to -10^-3.
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Is the shear induced spin polarization non-dissipative?
Shear-induced spin polarization leaves the momentum-integrated entropy production rate unchanged in chiral kinetic theory, but Zubarev's linear response suggests a dissipative origin.
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Initial conditions and bulk viscosity effects on $\Lambda$ polarization in high-energy heavy ion collisions
Bulk viscosity determines the sign of longitudinal Lambda polarization at LHC energies in hydrodynamic simulations, and the azimuthal dependence of transverse polarization is sensitive to initial-state choices.
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