1,808 research outputs found
Spinodal Instabilities of Baryon-Rich Quark-gluon Plasma in the PNJL Model
Using the Polyakov-Nambu-Jona-Lasinia (PNJL) model, we study the spinodal
instability of a baryon-rich quark-gluon plasma in the linear response theory.
We find that the spinodal unstable region in the temperature and density plane
shrinks with increasing wave number of the unstable mode and is also reduced if
the effect of Polyakov loop is not included. In the small wave number or long
wavelength limit, the spinodal boundaries in both cases of with and without the
Polyakov loop coincide with those determined from the isothermal spinodal
instability in the thermodynamic approach. Also, the vector interactions among
quarks is found to suppress unstable modes of all wave numbers. Moreover, the
growth rate of unstable modes initially increases with the wave number but is
reduced when the wave number becomes large. Including the collisional effect
from quark scattering via the linearized Boltzmann equation, we further find
that it decreases the growth rate of unstable modes of all wave numbers.
Relevance of these results to relativistic heavy ion collisions is discussed.Comment: 13 pages, 9 figure
Pion flow and antiflow in relativistic heavy-ion collisions
Within the framework of a relativistic transport model (ART) for heavy-ion
collisions at AGS energies, we study the transverse flow of pions with respect
to that of nucleons using two complementary approaches. It is found that in
central collisions pions develop a weak flow as a result of the flow of baryon
resonances from which they are produced. On the other hand, they have a weak
antiflow in peripheral collisions due to the shadowing of spectators.
Furthermore, it is shown that both pion flow and antiflow are dominated by
those with large transverse momenta.Comment: Phys. Rev. C, Rapid communication, in press. Figures are available
from the authors upon reques
Kaon dispersion relation and flow in relativistic heavy-ion collisions
Within the framework of a relativistic transport model (ART) for heavy-ion
collisions at AGS energies, we examine the effects of kaon dispersion relation
on the transverse flow of kaons and their transverse momentum and azimuthal
angle distributions. We find that the transverse flow is the most sensitive
observable for studying the kaon dispersion relation in dense medium.Comment: 7 pages, latex, 3 figures available upon request from the authors,
Phys. Rev. C (1996) in pres
Revealing Tripartite Quantum Discord with Tripartite Information Diagram
A new measure based on the tripartite information diagram is proposed for
identifying quantum discord in tripartite systems. The proposed measure
generalizes the mutual information underlying discord from bipartite to
tripartite systems, and utilizes both one-particle and two-particle projective
measurements to reveal the characteristics of the tripartite quantum discord.
The feasibility of the proposed measure is demonstrated by evaluating the
tripartite quantum discord for systems with states close to
Greenberger-Horne-Zeilinger, W, and biseparable states. In addition, the
connections between tripartite quantum discord and two other quantum
correlations---namely genuine tripartite entanglement and genuine tripartite
Einstein-Podolsky-Rosen steering---are briefly discussed. The present study
considers the case of quantum discord in tripartite systems. However, the
proposed framework can be readily extended to general N-partite systems
Elliptic flow splitting as a probe of the QCD phase structure at finite baryon chemical potential
Using a partonic transport model based on the 3-flavor Nambu-Jona-Lasinio
model and a relativistic hadronic transport model to describe, respectively,
the evolution of the initial partonic and the final hadronic phase of heavy-ion
collisions at energies carried out in the Beam-Energy Scan program of the
Relativistic Heavy Ion Collider, we have studied the effects of both the
partonic and hadronic mean-field potentials on the elliptic flow of particles
relative to that of their antiparticles. We find that to reproduce the measured
relative elliptic flow differences between nucleons and antinucleons as well as
between kaons and antikaons requires a vector coupling constant as large as 0.5
to 1.1 times the scalar coupling constant in the Nambu-Jona-Lasinio model.
Implications of our results in understanding the QCD phase structure at finite
baryon chemical potential are discussed.Comment: 5 pages, 4 figures, discussions added, version accepted by Phys. Rev.
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