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arXiv 1005.4950cond-mat.stat-mech
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非平衡临界短时弛豫过程的重整化群描述:三圈近似

Renormalization-group description of nonequilibrium critical short-time relaxation processes: a three-loop approximation

P. V. Prudnikov, V. V. Prudnikov, I. A. Kalashnikov

摘要:

用场论的重整化群方法描述了序参量的非平衡初值对其在临界点演化的影响。在动力学耗散模型中,采用三圈近似下的$\varepsilon$展开法,计算了具有$n$分量序参量的系统短时演化的动力学临界指数$θ'$.三维系统的$θ'$的数值确定使用Padé-Borel方法的渐近级数的总和。

英文摘要:

The influence of nonequilibrium initial values of the order parameter on its evolution at a critical point is described using a renormalization group approach of the field theory. The dynamic critical exponent $θ'$ of the short time evolution of a system with an $n$-component order parameter is calculated within a dynamical dissipative model using the method of $\varepsilon$-expansion in a three-loop approximation. Numerical values of $θ'$ for three-dimensional systems are determined using the Padé-Borel method for the summation of asymptotic series.

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