Phase structure analysis of CP(N-1) model using Tensor renormalization group

The phase structure of the lattice CP($N-1$) model in two dimensions is analyzed by the tensor renormalization group (TRG) method. We focus on the case $N=2$ and compare the numerical result of the TRG method with that of the strong-coupling analysis in the presence of the $θ$ term and investigate the nature of the phase transition at $θ=π$.

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