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We investigate the entanglement and R\'enyi entropies for the(1+1)-dimensional O(3) nonlinear sigma model using the tensor renormalizationgroup method. The central charge is determined from the asymptotic scalingproperties of both entropies. We also examine the consistency between theentanglement entropy and the $n$th-order R\'enyi entropy with $n\rightarrow 1$.

Entanglement and R\'enyi entropies of (1+1)-dimensional O(3) nonlinear sigma model with tensor renormalization group