Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-05-31
Phys.Rev.Lett. 83 (1999) 4697-4700
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, REVTEX, 6 figures, Short discussion of baryon-chemical potentials expected in relativistic heavy-ion collisions added
Scientific paper
10.1103/PhysRevLett.83.4697
We propose a novel mechanism for DCC formation in a first-order chiral phase transition. In this case the effective potential for the chiral order parameter has a local minimum at $\Phi\sim 0$ in which the chiral field can be ``trapped''. If the expansion is sufficiently fast a bubble of disoriented chiral field can emerge and decouple from the rest of the fireball. The bubble may overshoot the mixed phase and subsequently supercool until the barrier disappears, when the potential resembles that at T=0. This situation corresponds to the initial condition realized in a ``quench''. Thus, the subsequent alignment in the vacuum direction leads to strong amplification of low momentum modes of the pion field. We propose that these DCCs could accompany the previously suggested baryon rapidity fluctuations.
Dumitru Adrian
Scavenius Ove
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