Stable spontaneously-scalarized black holes in generalized scalar-tensor theories

Antoniou, Georgios; Macedo, Caio F. B.; McManus, Ryan; Sotiriou, Thomas P.

Abstract

It has been shown that the synergy of a scalar field coupling with both the Ricci scalar and the Gauss-Bonnet invariant significantly affects the properties of scalarized black holes and neutron stars, including their domain of existence and the amount of scalar hair they carry. Here we study the radial stability of scalarized black-hole solutions. We demonstrate that they are stable against radial perturbations for Ricci couplings consistent with both a late-time cosmological attractor and the evasion of binary pulsar constraints. In addition, we investigate the effect of the Ricci coupling on the hyperbolicity of the equation governing linear, radial perturbations and show that it significantly reduces the region over which hyperbolicity is lost.

Citation

Antoniou, G., Macedo, C. F., McManus, R., & Sotiriou, T. P. (2022). Stable spontaneously-scalarized black holes in generalized scalar-tensor theories. Physical Review D, 106(2), Article 024029. https://doi.org/10.1103/physrevd.106.024029

• Journal Article Type: Article
• Acceptance Date: May 11, 2022
• Online Publication Date: Jul 18, 2022
• Publication Date: Jul 15, 2022
• Deposit Date: Jul 22, 2022
• Publicly Available Date: Jul 26, 2022
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 106
• Issue: 2
• Article Number: 024029
• DOI: https://doi.org/10.1103/physrevd.106.024029
• Public URL: https://nottingham-repository.worktribe.com/output/9092878
• Publisher URL: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.106.024029