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(Referência obtida automaticamente do Google Scholar, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Kinetics Versus Hydrodynamics: Generalization of Landau/Cooper-Frye Prescription for Freeze-Out

Autor(es):
Sinyukov‚ Y.M. ; Akkelin‚ SV ; Karpenko‚ I.A. ; Hama‚ Y. ; others
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: ACTA PHYSICA POLONICA B; v. 40, n. 4, p. 1025-1035, 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. (AU)

Processo FAPESP: 04/10619-9 - Estudo de interações hadrônicas a altas energias
Beneficiário:Yogiro Hama
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 08/55658-2 - Yuri Mikhailovich Sinyukov | Bogolyubov Institute for Theorical Physics - Ucrânia
Beneficiário:Yogiro Hama
Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional