Non-equilibrium evolution of the disoriented chiral condensate in heavy-ion collisions

Conference · Wed Jun 01 04:00:00 EDT 1994

OSTI ID:10156353

Kluger, Y

We study the dynamics of the chiral phase transition expected during the expansion of the quark-qluon plasma produced in a high energy hadron or heavy ion collision in the O(4) linear sigma model to leading order in a large N expansion for strong coupling constants. Starting from an approximate equilibrium configuration at an initial proper time {tau} in the disordered phase, we study the transition to the ordered broken symmetry phase as the system expands and cools. We give results for the proper time evolution of the effective pion mass, the order parameter < {sigma} > as well as for the pion two point correlation function expressed in terms of a time dependent phase space number density and pair correlation density. We investigate the possibility of disoriented chiral condensate being formed during the expansion. In order to create large domains of disoriented chiral condensates low-momentum instabilities have to last for long enough periods of time. Our simulations show that instabilities that are formed during the initial stages of the expansion survive for proper times that are at most 3 fm/c.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 10156353
• Report Number(s): LA-UR--94-1566; CONF-940280--1; ON: DE94012897
• Country of Publication: United States
• Language: English

Related Subjects

662230
663450
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHIRAL SYMMETRY
CORRELATION FUNCTIONS
GREEN FUNCTION
HEAVY ION REACTIONS
HEAVY-ION-INDUCED REACTIONS AND SCATTERING
PHASE SPACE
PHASE TRANSFORMATIONS
QUANTUM CHROMODYNAMICS
QUARK MATTER
SIGMA MODEL