A procedure to solve gauge and tetrad invariant conservation equations coupling electromagnetic and gravitational perturbations of Kerr and Kerr–Newman space-times is presented. This procedure has two steps. In the first place it must be proved that one can use the gauge and tetrad freedom to write the conservation equation as a source-free Maxwell-like equation, and second, the conservation equation has to be solved in this particular gauge.
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Fayos et al. (1990) studied this question.
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