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arXiv 1608.01097hep-ph
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非均匀相模型中的一致正则化和重正化

Consistent regularization and renormalization in models with inhomogeneous phases

Prabal Adhikari, Jens O. Andersen

摘要:

在凝聚态物理和高能物理的许多模型中,人们发现在高密度和低温下存在非均匀相。这些相位的特征在于空间依赖的凝聚或序参量。正确的计算需要考虑模型的真空涨落。这些波动是紫外发散的,必须加以正规化。我们讨论了正则化和重整化量子涨落的不同一致性方法,重点讨论了对称能量截断方案和维数正则化。我们应用这些方法计算了1+1维NJL模型在大$N_c$极限下的真空能量和3+1维夸克-介子模型在平均场近似下的真空能量。

英文摘要:

In many models in condensed matter physics and high-energy physics, one finds inhomogeneous phases at high density and low temperature. These phases are characterized by a spatially dependent condensate or order parameter. A proper calculation requires that one takes the vacuum fluctuations of the model into account. These fluctuations are ultraviolet divergent and must be regularized. We discuss different consistent ways of regularizing and renormalizing quantum fluctuations, focusing on a symmetric energy cutoff scheme and dimensional regularization. We apply these techniques calculating the vacuum energy in the NJL model in 1+1 dimensions in the large-$N_c$ limit and the 3+1 dimensional quark-meson model in the mean-field approximation both for a one-dimensional chiral-density wave.

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