Isometric actions of compact quantum groups on graph C*-algebras

For a strongly connected directed graph $Λ$, it is shown that the quantum automorphism group of $Λ$ acts isometrically in the sense of D. Goswami et al. on the spectral triple $(C^{\ast}(Λ), L^{2}(Λ^{\infty},M),D)$ constructed by Farsi et al.. It is also shown that the natural action of $U_{n}^{+}$ is not isometric on the Cuntz algebra $\mathcal{O}_{n}$.

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