On freeze-out problem in relativistic hydrodynamics

Details On freeze-out problem in relativistic hydrodynamics On freeze-out problem in relativistic hydrodynamics

2008-10-13

arxiv.org/abs/0810.2262v2

Phys.Atom.Nucl.72:1238-1244,2009

Physics

Nuclear Physics

Nuclear Theory

6 pages, 2 figures, references are corrected and updated, to be published in the issue of Phys. Atom. Nucl. dedicated to S.T.

Scientific paper

10.1134/S1063778809070187

A finite unbound system which is equilibrium in one reference frame is in general nonequilibrium in another frame. This is a consequence of the relative character of the time synchronization in the relativistic physics. This puzzle was a prime motivation of the Cooper--Frye approach to the freeze-out in relativistic hydrodynamics. Solution of the puzzle reveals that the Cooper--Frye recipe is far not a unique phenomenological method that meets requirements of energy-momentum conservation. Alternative freeze-out recipes are considered and discussed.

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