Uniqueness theorems for static black holes in metric-affine gravity
Abstract
Using the equivalence theorem for the triplet ansatz sector of metric-affine gravity (MAG) theories and the Einstein-Proca system, it is shown that the only static black hole of the triplet sector of MAG is the Schwarzschild solution, under the constraint (-4β4 + k1β5/2k0 + k2γ4/k0)/ z4 ≠ 0 on the coupling constants. For the special case (-4β4 + k1β5/2k0 + k2γ4/k0)/ z4 = 0, it follows that the only static non-extremal black hole is the Reissner-Nordstr\"om one. The results can be extended to exclude also the existence of soliton solutions of the triplet sector of MAG.
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