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Reduced general relativity for four-dimensional spherically-symmetricstationary space-times, more simply called the black hole mini-superspace, wasshown in previous work to admit a symmetry under the three-dimensionalPoincar\'e group ISO(2,1). Such a non-semi-simple symmetry group usuallysignals that the system is a special case of a more general model admitting asemi-simple Lie group symmetry. We explore here possible modifications of theHamiltonian constraint of the mini-superspace. We identify in particular acontinuous deformation of the dynamics that lifts the degeneracy of thePoincar\'e group and leads to a SO(3,1) or SO(2,2) symmetry. This deformationis not related to the cosmological constant. We show that the deformed dynamicscan be represented as the superposition of two non-interacting homogeneous FRWcosmologies, with flat slices filled with perfect fluid. The resulting modifiedblack hole metrics are found to be non-singular.

Regularized Black Holes from Doubled FLRW Cosmologies