Critical point particle number fluctuations from molecular dynamics

Abstract

We study fluctuations of particle number in the presence of critical point by utilizing molecular dynamics simulations of the classical Lennard-Jones fluid in a periodic box. The numerical solution of the $N$-body problem naturally incorporates all correlations, exact conservation laws, and finite size effects, allowing us to study the fluctuation signatures of the critical point in a dynamical setup. We find that large fluctuations associated with the critical point are observed when measurements are performed in coordinate subspace, but, in the absence of collective flow and expansion, are essentially washed out when momentum cuts are imposed instead. We put our findings in the context of event-by-event fluctuations in heavy-ion collisions.

arXiv comment16 pages, 9 figures, to be published in Physical Review C

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Cited by in corpus (6)

• Cooper-Frye sampling with short-range repulsion
• Impact of hadronic interactions and conservation laws on cumulants of conserved charges in a dynamical model
• Factorial cumulants from short-range correlations and global baryon number conservation
• Cumulants from short-range correlations and baryon number conservation - next-to-leading order
• Fluctuations in heavy ion collisions and global conservation effects
• Fluctuations of conserved charges in hydrodynamics and molecular dynamics