1,726 research outputs found
Importance of Granular Structure in the Initial Conditions for the Elliptic Flow
We show effects of granular structure of the initial conditions (IC) of
hydrodynamic description of high-energy nucleus-nucleus collisions on some
observables, especially on the elliptic-flow parameter v2. Such a structure
enhances production of isotropically distributed high-pT particles, making v2
smaller there. Also, it reduces v2 in the forward and backward regions where
the global matter density is smaller, so where such effects become more
efficacious.Comment: 4 pages, 5 figure
HBT Interferometry for Sonoluminescence Bubble
The two-photon correlation of the light pulse emitted from a sonoluminescence
bubble is discussed. It is shown that several important information about the
mechanism of light emission, such as the time-scale and the shape of the
emission region could be obtained from the HBT interferometry. We also argue
that such a measurement may serve to reject one of the two currently suggested
emission mechanisms, i.e., thermal process versus dynamical Casimir effect.Comment: 13 pages, RevTeX, 2 eps figures include
Topics on Hydrodynamic Model of Nucleus-Nucleus Collisions
A survey is given on the applications of hydrodynamic model of
nucleus-nucleus collisons, focusing especially on i) the resolution of
hydrodynamic equations for arbitrary configurations, by using the
smoothed-particle hydrodynamic approach; ii) effects of the event-by-event
fluctuation of the initial conditions on the observables; iii) decoupling
criteria; iv) analytical solutions; and others.Comment: 30 pages, 29 figures; corrected typo
On the necessity to include event-by-event fluctuations in experimental evaluation of elliptical flow
Elliptic flow at RHIC is computed event-by-event with NeXSPheRIO. We show
that when symmetry of the particle distribution in relation to the reaction
plane is assumed, as usually done in the experimental extraction of elliptic
flow, there is a disagreement between the true and reconstructed elliptic flows
(15-30% for =0, 30% for =0.5 GeV). We suggest a possible way to
take into account the asymmetry and get good agreement between these elliptic
flows
Simple solutions of relativistic hydrodynamics for longitudinally expanding systems
Simple, self-similar, analytic solutions of 1+1 dimensional relativistic
hydrodynamics are presented, generalizing Bjorken's solution to inhomogeneous
rapidity distribution.Comment: 12 pages, elsart.cls, 2 eps figure
Simple solutions of relativistic hydrodynamics for systems with ellipsoidal symmetry
Simple, self-similar, analytic solutions of (1+3)-dimensional relativistic
hydrodynamics are presented for ellipsoidally symmetric finite fireballs
corresponding to non-central collisions of heavy ions at relativistic
bombarding energies. The hydrodynamical solutions are obtained for a new,
general family of equations of state with the possibility of describing phase
transitions.Comment: 13 pages, no figures, uses elsart.cl
Event-by-event analysis of ultra-relativistic heavy-ion collisions in smoothed particle hydrodynamics
The method of smoothed particle hydrodynamics (SPH) is applied for
ultra-relativistic heavy-ion collisions. The SPH method has several advantages
in studying event-by-event fluctuations, which attract much attention in
looking for quark gluon plasma (QGP) formation, because it gives a rather
simple scheme for solving hydrodynamical equations. Using initial conditions
for Au+Au collisions at RHIC energy produced by NeXus event generator, we solve
the hydrodynamical equation in event-by-event basis and study the fluctuations
of hadronic observables such as dN/dy due to the initial conditions. In
particular, fluctuations of elliptic flow coefficient v2 is investigated for
both the cases, with and without QGP formation. This can be used as an
additional test of QGP formation.Comment: LaTeX, 16 figures, 3 tables, 23 pages. Talk presented at 6th
International Workshop on Relativistic Aspects of Nuclear Physics(RANP2000),
Caraguatatuba, Tabatinga Beach, Sao Paulo, Brazil, October 17-20, 2000. To be
published in the proceedings (World Scientific, Singapore
Event-by-event fluctuations in hydrodynamical description of heavy-ion collisions
Effects caused by the event-by-event fluctuation of the initial conditions in
hydrodynamical description of high-energy heavy-ion collisions are
investigated. Non-negligible effects appear for several observable quantities,
even for a fixed impact parameter . They are sensitive to the equation
of state, being the dispersions of the observable quantities in general smaller
when the QGP phase appears at the beginning of hydrodynamic evolution than when
the fluid remains hadron gas during whole the evolution.Comment: 4 pages, 4 figures, talk presented to Quark Matter 2001 Conferenc
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