RT Journal Article
T1 Quasinormal modes of hot, cold and bald Einstein–Maxwell-scalar black holes
A1 Blázquez Salcedo, José Luis
A1 Herdeiro, Carlos A. R.
A1 Kahlen, Sarah
A1 Kunz, Jutta
A1 Pombo, Alexandre M.
A1 Radu, Eugen
AB Einstein–Maxwell-scalar models allow for different classes of black hole solutions, depending on the non-minimal coupling function f(ϕ) employed, between the scalar field and the Maxwell invariant. Here, we address the linear mode stability of the black hole solutions obtained recently for a quartic coupling function, f(ϕ)=1+αϕ4 (Blázquez-Salcedo et al. in Phys. Lett. B 806:135493, 2020). Besides the bald Reissner–Nordström solutions, this coupling allows for two branches of scalarized black holes, termed cold and hot, respectively. For these three branches of black holes we calculate the spectrum of quasinormal modes. It consists of polar scalar-led modes, polar and axial electromagnetic-led modes, and polar and axial gravitational-led modes. We demonstrate that the only unstable mode present is the radial scalar-led mode of the cold branch. Consequently, the bald Reissner–Nordström branch and the hot scalarized branch are both mode-stable. The non-trivial scalar field in the scalarized background solutions leads to the breaking of the degeneracy between axial and polar modes present for Reissner–Nordström solutions. This isospectrality is only slightly broken on the cold branch, but it is strongly broken on the hot branch.
PB Springer
SN 1434-6044
YR 2021
FD 2021-02-15
LK https://hdl.handle.net/20.500.14352/7268
UL https://hdl.handle.net/20.500.14352/7268
LA eng
NO Unión Europea. Horizonte 2020
NO FCT
NO DFG
NO Center for Research and Development in Mathematics and Applications (CIDMA) through the Portuguese Foundation for Science and Technology (FCT - Fundação para a Ciência e a Tecnologia)
DS Docta Complutense
RD 6 oct 2024