Critical Behavior and Dimension Crossover of Pion Superfluidity

Critical Behavior and Dimension Crossover of Pion Superfluidity
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介子超流性的临界行为和维度交叉

DOI:
10.1103/physrevd.94.056012
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发表时间:
2015-11
期刊:
Phys. Rev. D
影响因子:
--
通讯作者:
Pengfei Zhuang
Pengfei Zhuang
中科院分区:
其他
文献类型:
--
作者:
Ziyue Wang;Pengfei Zhuang

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在泛函重整化群的框架下研究了π介子超流的临界行为。通过求解有限温度和同位旋密度下具有π超流性的SU(2)线性σ模型中的流动方程,并与零温度和零密度但连续维数的一般O(N)模型中流动图的不动点分析进行比较,π介子超流是一个二级相变,它服从O(2)普适类,其维数从d_{eff}=4$到d_{\text{eff}}=3$。通常使用的大$N$展开给出了与温度无关的临界指数$\beta$,并且仅在零温度下与重整化群一致。
We investigate the critical behavior of pion superfluidity in the frame of functional renormalization group. By solving the flow equation in the SU(2) linear sigma model with pion superfluidity at finite temperature and isospin density, and making comparison with the fixed point analysis of the flow diagram in a general $O(N)$ model at zero temperature and density but with continuous dimension, the pion superfluidity is a second order phase transition subject to a $O(2)$ universality class with a dimension crossover from $d_{\text{eff}}=4$ to $d_{\text{eff}}=3$. The usually used large $N$ expansion gives a temperature independent critical exponent $\beta$ and agrees with the renormalization group only at zero temperature.
DOI: --
发表时间: 2008
期刊: --
影响因子: --
作者:
M. Kozlov;E. Levin;V. Khachtryan;J. Miller
通讯作者: M. Kozlov;E. Levin;V. Khachtryan;J. Miller