KINETICS VERSUS HYDRODYNAMICS: GENERALIZATION OF LANDAU/COOPER-FRYE PRESCRIPTION FOR FREEZE-OUT


Autoria(s): SINYUKOV, Yu. M.; AKKELIN, S. V.; KARPENKO, Iu A.; Hama, Yogiro
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/04/2012

18/04/2012

2009

Resumo

The 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-R-ye 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(sigma) (r, p), r) of the maximal emission at a fixed momentum p. The set of these points forms the hypersurfaces t(sigma)(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.

Identificador

ACTA PHYSICA POLONICA B, v.40, n.4, p.1025-1035, 2009

0587-4254

http://producao.usp.br/handle/BDPI/16159

http://th-www.if.uj.edu.pl/acta/vol40/pdf/v40p1025.pdf

Idioma(s)

eng

Publicador

POLISH ACAD SCIENCES INST PHYSICS

Relação

Acta Physica Polonica B

Direitos

openAccess

Copyright POLISH ACAD SCIENCES INST PHYSICS

Palavras-Chave #RELATIVISTIC NUCLEAR COLLISIONS #HEAVY-ION COLLISIONS #FLOW #EMISSION #Physics, Multidisciplinary
Tipo

article

proceedings paper

publishedVersion