Freeze-out by bulk viscosity driven instabilities

Details Freeze-out by bulk viscosity driven instabilities Freeze-out by bulk viscosity driven instabilities

2008-03-28

arxiv.org/abs/0803.4070v2

Acta Phys.Polon.B39:1733-1744,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Minor corrections and reference updates. In press, Acta Physica Polonica B Talk given at the Krakow Epiphany conference, Krako

Scientific paper

We describe a new scenario (first introduced in [G. Torrieri, B. Tom\'a\v{s}ik and I. Mishustin, Phys. Rev. C \textbf{77}, 034903 (2008)]) for freezeout in heavy ion collisions that could solve the lingering problems associated with the so-called HBT puzzle. We argue that bulk viscosity increases as $T$ approaches $T_c$. The fluid {then} becomes unstable against small perturbations, and fragments into clusters of a size much smaller than the total size of the system. These clusters maintain the pre-existing outward-going flow, as a spray of droplets, but develop no flow of their own, and hadronize by evaporation. We show that this scenario can explain HBT data and suggest how it can be experimentally tested.

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