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I comment on two recent papers on Kerr effect as evidence of gyrotropic orderin cuprates, and I suggest that the arguments may not be sound. The difficultyis that in practically all cases the wave vector $k_{z}$ perpendicular to thecopper-oxygen plane is not a good quantum number. This appears to beproblematic for arXiv:1212.2698, whereas in arXiv:1212.2274 the symmetryarguments may turn out to be robust, but the microscopic picture is wanting.Thus, the Kerr effect in cuprates remains a puzzle, as there is little doubtthat the arguments presented against time reversal symmetry breaking appear tobe rather strong in both of these papers on experimental grounds.

Comments on Kerr effect and gyrotropic order in cuprates