Comment on “Interpretation of thermal conductance of the ν = 5 / 2 edge”

We address the interpretation proposed in the paper [Simon, Phys. Rev. B 97, 121406(R) (2018)] of the thermal conductance data from [Banerjee et al., Nature (London) 559, 205 (2018)]. We show that the interpretation is inconsistent with experimental data and the sample structure. In particular, the paper misses the momentum mismatch between contrapropagating modes. Contrary to the claim of the paper, low energy tunneling involves a large momentum change. We consider only the “small Majorana velocity” mechanism [Simon, Phys. Rev. B 97, 121406(R) (2018)]. Other mechanisms, interpretations of the experiment, and their difficulties are beyond the scope of this Comment.