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Description
Ultralight bosons can condense to form the so-called scalar clouds around rotatingblack holes (BHs) through superradiant instabilities. When quantum effects near thePlanck scale of the event horizon are considered, the classical BH is replaced by anexotic compact object, such as an area-quantized BH. In this work, we examine thesuperradiant instabilities of massive scalar fields around area-quantized BHs. We modelthe frequency-dependent reflectivity function of area-quantized BHs for massive scalarfields, which reflects the distinctive selection property of these BHs for massive scalarfields. We then utilize this model to investigate the case where the scalar fields can besuperradiated by area-quantized BHs. We find that the area quantization of BHs canaffect the formation and effective radius, and suppress the total mass of scalar clouds.Especially, the energy gap of area-quantized BHs can break the growth continuity ofscalar clouds between different modes. These are distinct from the case of classical BHs.