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- W2792321866 abstract "When nuclei collide peripherally at relativistic velocities, a Quark-Gluon Plasma may be formed with much larger values of vorticity than in any other known physical system: the STAR collaboration has reported observations of global polarization of $Lambda$ and $overline{Lambda}$ hyperons, generated in such collisions, corresponding to a value of the local angular velocity about $9,pm 1,times 10^{21},cdot,$s$^{-1}$ (averaged over impact energies). We show that, in a gauge-gravity model of QGP vorticity, one should nevertheless expect the vorticity to be bounded above in a collision with a given collision energy and centrality; furthermore, this bound is by a quantity which emph{decreases} with increasing impact energy. That is, the prediction is that QGP vorticity should be suppressed in collisions at high energy: we predict that it should be barely detectable at $sqrt{s_{m{NN}}} = 200$ GeV, but much more evident in the lower-energy collisions studied in the various Beam Energy Scans. emph{This apparently paradoxical prediction is in fact supported by observational data}. The bound is approximately attained in the cases where hyperon polarization is observable; if this is always the case in such experiments, then the model agrees with recent suggestions that these observations are related to a strong dependence of the relevant plasma moment of inertia on impact energy." @default.
- W2792321866 created "2018-03-29" @default.
- W2792321866 creator A5082581961 @default.
- W2792321866 date "2018-03-07" @default.
- W2792321866 modified "2023-09-27" @default.
- W2792321866 title "A Bound on Vorticity" @default.
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