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A no-hair theorem for spherical black holes in scalar-tensor gravity ispresented. Contrary to the existing theorems, which are proved in the Einsteinconformal frame, this proof is performed entirely in the Jordan frame. Thetheorem is limited to spherical symmetry (instead of axisymmetry) but holds fornon-constant Brans-Dicke couplings.

Jordan frame no-hair for spherical scalar-tensor black holes