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In this comment we address the preprint Z. Yao et al. (arXiv:1402.5417v1)concerning the conditions upon which the correct critical temperature exponent$\phi$ can be observed (experimentally or numerically) close to thesuperfluid-Bose glass quantum phase transition in three dimensions. Yao et al.announce to have resolved the contradiction between the predictions of Fisheret al. [Phys. Rev. B 40, 546 (1989)] that $\phi = \nu z \geq 2$ (where $\nu$and $z$ are critical exponents at the quantum phase transition) and recentexperiments and simulations, showing an exponent $\phi \sim 1.1$. Yao et al'sresolution hinges on claiming that the $\phi \sim 1.1$ observations, which wereconducted by varying the chemical potential, were not made to sufficientlyclose to the critical point to observe universal behavior. Here we criticallyexamine their criteria for observing universal behavior. We show that pastsimulations were in fact conducted closer to the quantum critical point thanthe new results of Yao et al.; and that Yao et al.'s own results for varyingchemical potential are consistent with previous results showing $\phi \sim1.1$, and do not show a clear crossover to a different $\phi$ value.

Comment to "Critical Exponents of the Superfluid-Bose Glass Transition in Three-Dimensions" by Z. Yao et al., arXiv:1402.5417v1