Thermalization of overpopulated systems in the 2PI formalism
Thermalization of overpopulated systems in the 2PI formalism
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DOI：
10.1103/physrevd.96.036004
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发表时间：
2017-05
影响因子：
5
通讯作者：
S. Tsutsui;J. Blaizot;Y. Hatta
中科院分区：
文献类型：
--
作者：
S. Tsutsui;J. Blaizot;Y. Hatta
基于$1/N$展开下次领先阶的两粒子不可约（2 PI）形式，研究了中等耦合标量$O（N）$理论中的过布居系统的热化.我们特别关注软模的增长，并研究这是否会导致形成瞬态玻色-爱因斯坦凝聚（BEC）时，初始占有率是足够高的。对于在我们的模拟中使用的耦合常数的值，我们发现，虽然系统迅速接近凝聚阈值，形成的BEC最终阻碍了粒子数变化过程。
Based on the two-particle irreducible (2PI) formalism to next-to-leading order in the $1/N$ expansion, we study the thermalization of overpopulated systems in scalar $O(N)$ theories with moderate coupling. We focus in particular on the growth of soft modes, and examine whether this can lead to the formation of a transient Bose-Einstein condensate (BEC) when the initial occupancy is high enough. For the value of the coupling constant used in our simulations, we find that while the system rapidly approaches the condensation threshold, the formation of a BEC is eventually hindered by particle number changing processes.