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- W1867686091 abstract "Rotating black holes can support quasi-stationary (unstable) bound-state resonances of massive scalar fields in their exterior regions. These spatially regular scalar configurations are characterized by instability timescales which are much longer than the timescale M set by the geometric size (mass) of the central black hole. It is well-known that, in the small-mass limit α≡Mμ≪1 (here μ is the mass of the scalar field), these quasi-stationary scalar resonances are characterized by the familiar hydrogenic oscillation spectrum: ωR/μ=1−α2/2n¯02, where the integer n¯0(l,n;α→0)=l+n+1 is the principal quantum number of the bound-state resonance (here the integers l=1,2,3,… and n=0,1,2,… are the spheroidal harmonic index and the resonance parameter of the field mode, respectively). As it depends only on the principal resonance parameter n¯0, this small-mass (α≪1) hydrogenic spectrum is obviously degenerate. In this paper we go beyond the small-mass approximation and analyze the quasi-stationary bound-state resonances of massive scalar fields in rapidly-spinning Kerr black-hole spacetimes in the regime α=O(1). In particular, we derive the non-hydrogenic (and, in general, non-degenerate) resonance oscillation spectrum ωR/μ=1−(α/n¯)2, where n¯(l,n;α)=(l+1/2)2−2mα+2α2+1/2+n is the generalized principal quantum number of the quasi-stationary resonances. This analytically derived formula for the characteristic oscillation frequencies of the composed black-hole-massive-scalar-field system is shown to agree with direct numerical computations of the quasi-stationary bound-state resonances." @default.
- W1867686091 created "2016-06-24" @default.
- W1867686091 creator A5046640072 @default.
- W1867686091 date "2015-10-01" @default.
- W1867686091 modified "2023-09-28" @default.
- W1867686091 title "Quasi-bound states of massive scalar fields in the Kerr black-hole spacetime: Beyond the hydrogenic approximation" @default.
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- W1867686091 doi "https://doi.org/10.1016/j.physletb.2015.07.071" @default.
- W1867686091 hasPublicationYear "2015" @default.
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