Kinetics vs hydrodynamics: generalization of Landau/Cooper-Frye prescription for freeze-out

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dc.creatorSinyukov, Yu. M.
dc.creatorAkkelin, S. V.
dc.creatorKarpenko, Iu. A.
dc.creatorHama, Y.
dc.date2009-01-12
dc.date.accessioned2026-07-07T13:07:44Z
dc.date.available2026-07-07T13:07:44Z
dc.descriptionThe problem of spectra formation in hydrodynamic approach to A+A collisions is considered within the Boltzmann equations. It is shown analytically and illustrated by numerical calculations that the particle momentum spectra can be presented in the Cooper-Frye form despite freeze-out is not sharp and has the finite temporal width. The latter is equal to the inverse of the particle collision rate at points $(t_σ({\bf r},p),{\bf r})$ of the maximal emission at a fixed momentum $p$. The set of these points forms the hypersurfaces $t_σ({\bf r},p)$ which strongly depend on the values of $p$ and typically do not enclose completely the initially dense matter. This is an important difference from the standard Cooper-Frye prescription (CFp), with a common freeze-out hypersurface for all $p$, that affects significantly the predicted spectra. Also, the well known problem of CFp as for negative contributions to the spectra from non-space-like parts of the freeze-out hypersurface is naturally eliminated in this improved prescription.
dc.description10 pages, 3 figures, presented at Workshop on Particle Correlations and Femtoscopy: WPCF-2008
dc.identifierhttps://arxiv.org/abs/0901.1576
dc.identifierhttp://arxiv.org/abs/0901.1576
dc.identifierActa Phys.Polon.B40:1025-1036,2009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/228186
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Experiment
dc.titleKinetics vs hydrodynamics: generalization of Landau/Cooper-Frye prescription for freeze-out
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