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Titolo:
HOT-SPOTS AND TURBULENT INITIAL CONDITIONS OF QUARK-GLUON PLASMAS IN NUCLEAR COLLISIONS
Autore:
GYULASSY M; RISCHKE DH; ZHANG B;
Indirizzi:
COLUMBIA UNIV,DEPT PHYS,PUPIN PHYS LABS,538 W 120TH ST NEW YORK NY 10027
Titolo Testata:
Nuclear physics. A
fascicolo: 4, volume: 613, anno: 1997,
pagine: 397 - 434
SICI:
0375-9474(1997)613:4<397:HATICO>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEAVY-ION COLLISIONS; FLUX-CORRECTED TRANSPORT; PION INTERFEROMETRY; MONTE-CARLO; ENERGY-LOSS; QCD; MODEL; EQUATION; STATE; FLUCTUATIONS;
Keywords:
RELATIVISTIC HEAVY-ION COLLISIONS; RELATIVISTIC FLUID DYNAMICS; PHASE TRANSITIONS; QUARK-GLUON PLASMA; MINIJET PRODUCTION, TURBULENCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
65
Recensione:
Indirizzi per estratti:
Citazione:
M. Gyulassy et al., "HOT-SPOTS AND TURBULENT INITIAL CONDITIONS OF QUARK-GLUON PLASMAS IN NUCLEAR COLLISIONS", Nuclear physics. A, 613(4), 1997, pp. 397-434

Abstract

As a result of multiple mini-jet production, initial conditions of the QCD plasma formed in ultrarelativistic nuclear collisions may be inhomogeneous, with large fluctuations of the local energy density (hot spots),and turbulent, with a chaotic initial transverse velocity field. Assuming rapid local thermalization, the evolution of such plasmas iscomputed using longitudinal boost-invariant (3+1)-dimensional hydrodynamics. We compare the evolution in case that the speed of sound in the plasma is constant to one resulting from an equation of state involving a strong first-order transition, with a minimum of the velocity ofsound as a function of energy density, We find that azimuthally asymmetric fluctuations and correlations of the transverse energy flow, dE(perpendicular to)/dy d phi, can develop in both cases due to the initial inhomogeneities. Hot spots also enhance significantly high-k(perpendicular to) direct photon yields, In the case with a phase transition,the hadronization surface evolves into an unusual foam-like structure. Also in that case, we find that hadronization is considerably delayed relative to the ideal gas case, just as previous studies have found for homogeneous initial conditions. The time-delay signature of a rapid cross-over transition region in the QCD equation of state (as observable via meson interferometry) is thus found to be remarkably robust to uncertainties in the initial conditions in heavy-ion reactions.

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Documento generato il 07/08/20 alle ore 00:55:23