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Spin-Induced Black Hole Spontaneous Scalarization

Dima, Alexandru; Barausse, Enrico; Franchini, Nicola; Sotiriou, Thomas P.

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Alexandru Dima

Enrico Barausse

Nicola Franchini

Professor of Gravitational Physics



We study scalar fields in a black hole background and show that, when the scalar is suitably coupled to curvature, rapid rotation can induce a tachyonic instability. This instability, which is the hallmark of spontaneous scalarization in the linearized regime, is expected to be quenched by nonlinearities and endow the black hole with scalar hair. Hence, our results demonstrate the existence of a broad class of theories that share the same stationary black hole solutions with general relativity at low spins, but which exhibit black hole hair at sufficiently high spins (a/M0.5). This result has clear implications for tests of general relativity and the nature of black holes with gravitational and electromagnetic observations.


Dima, A., Barausse, E., Franchini, N., & Sotiriou, T. P. (2020). Spin-Induced Black Hole Spontaneous Scalarization. Physical Review Letters, 125(23), Article 231101.

Journal Article Type Article
Acceptance Date Oct 27, 2020
Online Publication Date Dec 1, 2020
Publication Date Dec 1, 2020
Deposit Date Feb 2, 2021
Publicly Available Date Feb 8, 2021
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 125
Issue 23
Article Number 231101
Keywords General Physics and Astronomy
Public URL
Publisher URL
Additional Information Spin-Induced Black Hole Spontaneous Scalarization, Alexandru Dima, Enrico Barausse, Nicola Franchini, and Thomas P. Sotiriou, Phys. Rev. Lett. 125, 231101.


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