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Iron Kα line of Kerr black holes with scalar hair

Bambi, Cosimo; Zhou, Menglei; Ni, Yueying +3 more

Recently, a family of hairy black holes in 4-dimensional Einstein gravity minimally coupled to a complex, massive scalar field was discovered [1]. Besides the mass M and spin angular momentum J, these objects are characterized by a Noether charge Q, measuring the amount of scalar hair, which is not associated to a Gauss law and cannot be measured …

Iron Kα line of boson stars

Cao, Zheng; Bambi, Cosimo; Zhou, Menglei +3 more

The present paper is a sequel to our previous work [1] in which we studied the iron Kα line expected in the reflection spectrum of Kerr black holes with scalar hair. These metrics are solutions of Einstein's gravity minimally coupled to a massive, complex scalar field. They form a continuous bridge between a subset of Kerr black holes and a family…