Year: 1995
Type: article
Abstract: We address the issue of whether a region of disoriented chiral condensate (DCC), in which the chiral condensate has components along the pion directions, can form. We consider a system going through the chiral phase transition via a quench, in which relaxation of the high temperature phase to the low temperature one occurs rapidly (within a time scale of order \ensuremath{\sim}1 fm/c). We use a density matrix based formalism that takes both thermal and quantum fluctuations into account nonperturbatively to argue that if the O(4) linear \ensuremath{\sigma} model is the correct way to model the situation in QCD, then it is very unlikely, at least in the Hartree approximation, that a large (>10 fm) DCC region will form. Typical sizes of such regions are \ensuremath{\sim}1--2 fm and the density of pions in such regions is at most of order \ensuremath{\sim}0.2/${\mathrm{fm}}^{3}$. We end with some speculations on how large DCC regions may be formed.
Authors: D. Boyanovsky, H. J. de Vega, R. Holman
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2079140956