 Gryb et al. (2018) compare the kinds of universality argument seemingly needed in this case to the more standard, familiar form of such arguments made in the context of renormalization group methods. They conclude that all available universality arguments made to support taking analogue experiments to confirm the existence of Hawking radiation are wanting in at least one of six categories that they collectively deem necessary for such arguments to work (robustness, physical plausibility, degree of universality, empirical support, and integration of robustness and universality), with failure of integration being the most serious problem. 