随机流体的N粒子不可约作用量
N-particle irreducible actions for stochastic fluids
AI总结:
本文构造了守恒密度随机流体动力学的一粒子和两粒子不可约有效作用量,推导并用Pauli-Villars场正则化了Schwinger-Dyson方程,数值求解发现高圈效应重整化了非线性耦合,并揭示了带有逐渐减小指数抑制的n圈修正迹象。
摘要:
我们构造了 undergoing diffusive motion 的守恒密度随机流体动力学的一粒子和两粒子不可约(1PI和2PI)有效作用量。我们在单圈阶计算了1PI作用量,并在双圈近似下计算了2PI作用量。我们推导了一组Schwinger-Dyson方程,并使用Pauli-Villars场对所得方程进行正则化。我们数值求解了非临界流体的Schwinger-Dyson方程。我们发现Schwinger-Dyson求和的高圈效应重整化了非线性耦合。我们还发现了diffuson-cascade的迹象,即n圈修正的出现带有越来越小的指数抑制。
英文摘要:
We construct one- and two-particle irreducible (1PI and 2PI) effective actions for the stochastic fluid dynamics of a conserved density undergoing diffusive motion. We compute the 1PI action at one-loop order, and the 2PI action in two-loop approximation. We derive a set of Schwinger-Dyson equations, and regularize the resulting equations using Pauli-Villars fields. We numerically solve the Schwinger-Dyson equations for a non-critical fluid. We find that higher-loop effects summed by the Schwinger-Dyson renormalize the non-linear coupling. We also find indications of a diffuson-cascade, the appearance $n$-loop corrections with smaller and smaller exponential suppression.
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