SMuK 2021 – scientific programme
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GR: Fachverband Gravitation und Relativitätstheorie
GR 1: Black Holes
GR 1.6: Talk
Monday, August 30, 2021, 12:15–12:30, H2
Quasinormal modes of hot, cold and bald Einstein-Maxwell-scalar black holes — Jose Luis Blázquez-Salcedo1, Carlos A. R. Herdeiro2, •Sarah Kahlen3, Jutta Kunz3, Alexandre M. Pombo2, and Eugen Radu2 — 1Universidad Complutense de Madrid, Spain — 2Universidade de Aveiro, Portugal — 3Universität Oldenburg, Germany
In Einstein-Maxwell-scalar (EMs) theory, gravity is coupled to a Maxwell field and a scalar field φ, with some function f coupling the two fields. The choice of that function strongly influences the properties of the resulting black hole solutions. In the talk, static spherically symmetric EMs black hole solutions with coupling function f(φ)=1+α φ4 are dealt with. For fixed coupling constant α, there are two branches of solutions. The quasinormal modes, the eigenvalues of the linearly perturbed field equations, that can be categorized into axial and polar modes, are presented for both these branches. This allows for statements about their stability, and it is furthermore demonstrated how the presence of the scalar field influences different types of modes and breaks the isospectrality between polar and axial modes, which e.g. holds for Reissner-Nordström black holes in Einstein-Maxwell theory and for Schwarzschild black holes.