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arXiv · 1710.03118

Broadening of the chiral critical region in a hydrodynamically expanding medium

Christoph Herold·Marcus Bleicher·Marlene Nahrgang·Jan Steinheimer·Ayut Limphirat·Chinorat Kobdaj·Yupeng Yan
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Abstract

We investigate higher cumulants of the sigma field as the chiral order parameter at the QCD phase transition. We derive a thermodynamic expression for the skewness and kurtosis from susceptibilities and use these to determine $S\sigma$ and $\kappa\sigma^2$ for the sigma field in equilibrium. In a next step, we study the behavior of these cumulants in both an equilibrated static medium and an expanding medium resembling the hydrodynamic stage of a heavy-ion collision. For the latter one, we find a significant broadening of the critical region.

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Christoph Herold, Marcus Bleicher, Marlene Nahrgang, Jan Steinheimer, Ayut Limphirat, Chinorat Kobdaj, Yupeng Yan. 2017-10-09. Broadening of the chiral critical region in a hydrodynamically expanding medium. https://doi.org/10.1140/epja%2Fi2018-12438-1

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