Comment on "Can accretion disk properties observationally distinguish black holes from naked singularities?"

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One points out that a metric used as a General Relativity filled by a massless scalar φ solution in several studies, and that would have been a generalization of the Janis-Newman-Winicour spherical solution to the rotating case, does not solve the corresponding Einstein equation Rab=∂aφ∂bφ. As a consequence, the (conformally related) Krori-Bhattacharjee spacetime is not a vacuum Brans-Dicke solution.

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