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arXiv 2003.01034hep-th
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大N时二维线性西格玛模型中的非均匀态

Inhomogeneous states in two dimensional linear sigma model at large N

A. Pikalov

摘要:

本文考虑二维线性西格玛模型在大$N$极限下的非齐次解.这些解与最近在二维$CP^N$西格玛模型中发现的解相似。该解只存在于一定范围的耦合常数。我们计算的能量的解决方案作为模型的参数的函数,并表明,在某些值的耦合常数,它改变信号的符号可能的相变。本文还讨论了有限温度下非线性模型的情形。非均匀溶液的自由能在某一临界温度下变号。

英文摘要:

In this note we consider inhomogeneous solutions of two-dimensional linear sigma model in the large $N$ limit. These solutions are similar to the ones found recently in two-dimensional $CP^N$ sigma model. The solution exists only for some range of coupling constant. We calculate energy of the solutions as function of parameters of the model and show that at some value of the coupling constant it changes sign signaling a possible phase transition. The case of the nonlinear model at finite temperature is also discussed. The free energy of the inhomogeneous solution is shown to change sign at some critical temperature.

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