Molecular dynamics analysis of particle number fluctuations in the mixed phase of a first-order phase transition

Kuznietsov, Volodymyr A.; Savchuk, Oleh; Poberezhnyuk, Roman V.; Vovchenko, Volodymyr; Gorenstein, Mark I.; Stoecker, Horst

doi:10.1103/PhysRevC.107.055206

Title: Molecular dynamics analysis of particle number fluctuations in the mixed phase of a first-order phase transition

Journal Article · Fri May 26 00:00:00 UTC 2023 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.107.055206 · OSTI ID:1975417

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Bogolyubov Institute for Theoretical Physics, Kyiv (Ukraine); Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Frankfurt Inst. for Advanced Studies (FIAS), Frankfurt (Germany)
Michigan State Univ., East Lansing, MI (United States); Bogolyubov Institute for Theoretical Physics, Kyiv (Ukraine); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Frankfurt Inst. for Advanced Studies (FIAS), Frankfurt (Germany)
Bogolyubov Institute for Theoretical Physics, Kyiv (Ukraine); Frankfurt Inst. for Advanced Studies (FIAS), Frankfurt (Germany)
Univ. of Houston, TX (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Frankfurt Inst. for Advanced Studies (FIAS), Frankfurt (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Goethe Univ., Frankfurt (Germany)

Molecular dynamics simulations are performed for a finite nonrelativistic system of particles with Lennard-Jones potential. We study the effect of liquid-gas mixed phase on particle number fluctuations in coordinate subspace. A metastable region of the mixed phase, the so-called nucleation region, is analyzed in terms of a noninteracting cluster model. Large fluctuations due to spinodal decomposition are observed. They arise due to the interplay between the size of the acceptance region and that of the liquid phase. These effects are studied with a simple geometric model. The model results for the scaled variance of particle number distribution are compared with those obtained from the direct molecular dynamic simulations.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Michigan State University, East Lansing, MI (United States)

Sponsoring Organization:: National Academy of Sciences of Ukraine; Simons Foundation; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231; FG02-03ER41259

OSTI ID:: 1975417

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 107; ISSN 2469-9985; ISSN 2469-9993

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Molecular dynamics analysis of particle number fluctuations in the mixed phase of a first-order phase transition

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