A study of vorticity formation in high energy nuclear collisions
By F. Becattini, G. Inghirami, V. Rolando, A. Beraudo, L. Del Zanna, A. Pace, M. Nardi, G. Pagliara, V. Chandra. 2015
210 citations recorded by the source corpus.
We present a quantitative study of vorticity formation in peripheral ultrarelativistic heavy-ion collisions at $${\sqrt{s}_\mathrm{NN}}= 200$$sNN=200 GeV by using the ECHO-QGP numerical code, implementing relativistic dissipative hydrodynamics in the causal Israel–Stewart framework in $$3+1$$3+1 dimensions with an initial Bjorken flow profile. We consider different definitions of vorticity which are relevant in relativistic hydrodynamics. After demonstrating the excellent capabilities of our code, which proves to be able to reproduce Gubser flow up to 8 fm/c, we show that, with the initial conditions needed to reproduce the measured directed flow in peripheral collisions corresponding to an average impact parameter $$b=11.6$$b=11.6 fm and with the Bjorken flow profile for a viscous Quark Gluon Plasma with $$\eta /s=0.1$$η/s=0.1 fixed, a vorticity of the order of some $$10^{-2}\,c$$10-2c/fm can develop at freeze-out. The ensuing polarization of $$\Lambda $$Λ baryons does not exceed 1.4 % at midrapidity. We show that the amount of developed directed flow is sensitive to both the initial angular momentum of the plasma and its viscosity.
Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/471d91592510c207f3a50726d1b7d751019291bb
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Citations in the corpus
- Global polarization of $\Lambda$ hyperons in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV (2018, unknown): “It is likely related to other observables such as directed flow, elliptic flow, and the source tilt of the system measured via femtoscopy [9, 11, 16].”
- Mapping the phases of quantum chromodynamics with beam energy scan (2019, background): “Owing to the compressible nature of this fluid, it will develop a nontrivial distribution of local fluid vorticity which has a nonzero average 〈ω〉 over the whole fluid along the out-of-plane direction [173–178].”
- Global hyperon polarization at local thermodynamic equilibrium with vorticity, magnetic field and feed-down (2016, background): “Accounting for vorticity (via tuning the initial conditions and specific viscosity) it was possible to quantitatively describe the rapidity dependence of directed flow [3,4], which, at present, cannot be described by any model not including initial angular momentum [2,5,6].”