Black holes with surrounding matter in scalar-tensor theories
Vitor Cardoso, Isabella P. Carucci, Paolo Pani, Thomas P. Sotiriou
TL;DR
This paper identifies two mechanisms causing instability in Kerr black holes within scalar-tensor theories, emphasizing the role of surrounding matter and scalar effective mass in realistic astrophysical scenarios.
Contribution
It reveals how matter near black holes induces instabilities in scalar-tensor gravity, a novel insight into black hole physics in alternative theories of gravity.
Findings
Two instability mechanisms linked to matter presence
Scalar effective mass influences black hole stability
Highlights importance of realistic astrophysical conditions
Abstract
We uncover two mechanisms that can render Kerr black holes unstable in scalar-tensor gravity, both associated to the presence of matter in the vicinity of the black hole and the fact that this introduces an effective mass for the scalar. Our results highlight the importance of understanding the structure of spacetime in realistic, astrophysical black holes in scalar-tensor theories.
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