Net-baryon number variance and kurtosis within nonequilibrium chiral fluid dynamics
| Autor: | Herold, Christoph, Nahrgang, Marlene, Yan, Yupeng, Kobdaj, Chinorat |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | J. Phys. G: Nucl. Part. Phys. 41 (2014) 115106 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0954-3899/41/11/115106 |
| Popis: | We study the variance and kurtosis of the net-baryon number in a fluid dynamical model for heavy-ion collisions. It is based on an effective chiral model with dilatons for the strong coupling regime of QCD. Taking into account spinodal instabilities, we demonstrate that this model exhibits a diverging quark number susceptibility and kurtosis all along the spinodal lines of the first-order phase transition, with a change of universality class at the critical end point. During the (3+1) dimensional expansion of a hot and dense fireball, instabilities are created by fluctuations in the explicitly propagated chiral and dilaton field. We find a clear enhancement of event-by-event fluctuations of the baryon number at the critical point and first-order phase transition in comparison with an evolution through the crossover region. Comment: 15 pages, 5 figures |
| Databáze: | arXiv |
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