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arXiv 2007.00666cond-mat.stat-mech
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非解析非平衡场论:伊辛模型的随机再热

Non-Analytic Non-Equilibrium Field Theory: Stochastic Reheating of the Ising Model

Camille Aron, Manas Kulkarni

摘要:

多体非平衡定态可以用朗道-金兹伯格理论来描述,如果允许势中有非解析项的话。我们通过计算伊辛磁体与热浴接触并经历随机再加热的情况来证实这一说法:它在随机时间被重置为顺磁体。通过随机场论和蒙特卡罗模拟的结合,我们揭示了通常的$φ^4$势是如何被内禀非平衡性质的非解析算子变形的。我们证明了它们的红外相关性在低温下的重整化组分析的非平衡稳态。平衡铁磁固定点,从而不稳定的随机再加热,我们确定了新的非平衡固定点。

英文摘要:

Many-body non-equilibrium steady states can be described by a Landau-Ginzburg theory if one allows non-analytic terms in the potential. We substantiate this claim by working out the case of the Ising magnet in contact with a thermal bath and undergoing stochastic reheating: It is reset to a paramagnet at random times. By a combination of stochastic field theory and Monte Carlo simulations, we unveil how the usual $φ^4$ potential is deformed by non-analytic operators of intrinsic non-equilibrium nature. We demonstrate their infrared relevance at low temperatures by a renormalization-group analysis of the non-equilibrium steady state. The equilibrium ferromagnetic fixed point is thus destabilized by stochastic reheating, and we identify the new non-equilibrium fixed point.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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