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      Vortical fluid and \(\Lambda\) spin correlations in high-energy heavy-ion collisions

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          Abstract

          Fermions become polarized in a vortical fluid due to spin-vorticity coupling. The spin polarization density is proportional to the local fluid vorticity at the next-to-leading order of a gradient expansion in a quantum kinetic theory. Spin correlations of two \(\Lambda\)-hyperons can therefore reveal the vortical structure of the dense matter in high-energy heavy-ion collisions. We employ a (3+1)D viscous hydrodynamic model with event-by-event fluctuating initial conditions from A MultiPhase Transport (AMPT) model to calculate the vorticity distributions and \(\Lambda\) spin correlations. The azimuthal correlation of the transverse spin is shown to have a cosine form plus an offset due to a circular structure of the transverse vorticity around the beam direction and global spin polarization. The longitudinal spin correlation shows a structure of vortex-pairing in the transverse plane due to the convective flow of hot spots in the radial direction. The dependence on colliding energy, rapidity, centrality and sensitivity to the shear viscosity are also investigated.

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          New High-Resolution Semi-discrete Central Schemes for Hamilton–Jacobi Equations

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            Author and article information

            Journal
            2016-05-12
            Article
            1605.04024
            954900ca-c947-4b0a-914d-f3237268fc6f

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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            Custom metadata
            5 pages in Latex, 3 figures
            hep-ph nucl-ex nucl-th

            High energy & Particle physics,Nuclear physics
            High energy & Particle physics, Nuclear physics

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