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Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
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Vortical Fluid and Λ Spin Correlations in High-Energy Heavy-Ion Collisions
Long-Gang Pang1, Hannah Petersen1,2,3, Qun Wang4
1Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany.
Physical Review Letters
|November 19, 2016
Summary
Fermions in vortical fluids exhibit spin polarization linked to fluid vorticity. Radial expansion in heavy-ion collisions creates spin correlations in hyperon momentum, revealing key vortical structures.
Area of Science:
- Nuclear Physics
- High-Energy Physics
- Fluid Dynamics
Background:
- Fermions in vortical fluids display spin polarization due to spin-vorticity coupling.
- This polarization is directly proportional to local fluid vorticity.
- Radial expansion transforms spatial vortical structures into spin correlations in final hyperon transverse momentum.
Purpose of the Study:
- Investigate the conversion of spatial vortical structures into spin correlations.
- Identify and characterize vortical structures in heavy-ion collisions.
- Analyze the azimuthal correlation of hyperon transverse spin.
Main Methods:
- Utilized a (3+1)D viscous hydrodynamic model.
- Incorporated fluctuating initial conditions from the AMPT model.
- Calculated azimuthal correlations of transverse spin and longitudinal spin.
Main Results:
- Revealed toroidal and paired longitudinal vortical structures.
- Observed a cosine form plus offset in transverse spin correlation due to toroidal vorticity.
- Found oscillatory longitudinal spin correlation from multiple transverse vorticity pairs.
Conclusions:
- The study elucidates the connection between fluid vorticity and hyperon spin polarization.
- Identified specific vortical structures influencing spin correlations.
- Results provide insights into spin-vorticity coupling in relativistic heavy-ion collisions.
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