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Scaling Properties of Spectra in New Exact Solutions of Rotating, Multi-Component Fireball Hydrodynamics

by Tamás Csörgő 1,2,* and Gábor Kasza 2
1
Wigner RCP, H-1525 Budapest 114, P.O.Box 49, Hungary
2
EKU KRC, H-3200 Gyöngyös, Mátrai út 36, Hungary
*
Author to whom correspondence should be addressed.
Universe 2018, 4(4), 58; https://doi.org/10.3390/universe4040058
Received: 25 January 2018 / Revised: 23 February 2018 / Accepted: 23 February 2018 / Published: 26 March 2018
We describe fireballs that rehadronize from a perfect fluid of quark matter, characterized by the lattice QCD equation of state, to a chemically frozen, multi-component mixture, that contains various kinds of observable hadrons. For simplicity and clarity, we apply a non-relativistic approximation to describe the kinematics of this expansion. Unexpectedly, we identify a secondary explosion that may characterize fireball hydrodynamics at the QCD critical point. After rehadronization, the multi-component mixture of hadrons keeps on rotating and expanding together, similarly to a single component fluid. After kinetic freeze-out, the effective temperature T i of the single-particle spectra of hadron type h i is found to be a sum of the kinetic freeze-out temperature T f (that is independent of the hadron type h i ) and a term proportional to the mass m i of hadron type h i . The coefficient of proportionality to m i is found to be independent of the hadron type h i but to be dependent on the radial flow and vorticity of collective dynamics. View Full-Text
Keywords: hydrodynamics; exact solution; quark-gluon plasma; hadronization; vorticity; radial flow hydrodynamics; exact solution; quark-gluon plasma; hadronization; vorticity; radial flow
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Csörgő, T.; Kasza, G. Scaling Properties of Spectra in New Exact Solutions of Rotating, Multi-Component Fireball Hydrodynamics. Universe 2018, 4, 58.

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