Scalarized black holes in new massive gravity dressed by a nonminimally coupled scalar

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2023-12, Vol.83 (12), p.1137-7, Article 1137
• Main Author: Myung, Yun Soo
• Format: Article
• Language: English
• Subjects: Astronomy; Astrophysics and Cosmology; Black holes; Computer simulation; Elementary Particles; Gravity; Hadrons; Heavy Ions; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Parameters; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Regular Article - Theoretical Physics; Stability; String Theory; Thermodynamics
• ISSN: 1434-6052; 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-023-12327-8

We investigate scalarized black holes in new massive gravity dressed by a nonminimally coupled scalar. For this purpose, we find the Gregory–Laflamme (GL) and tachyonic instability bounds of bald BTZ black hole expressed in terms of m 2 a massive spin-2 parameter and α a scalar coupling parameter to Ricci scalar by making use of the linearized theory around black hole. On the other hand, we obtain a solution bound of 0.161 < α < 3 / 16 for achieving non-BTZ black holes with scalar hair analytically and a thermodynamic bound of 1 / 8 < α < 13 / 80 for obtaining consistent thermodynamic quantities. Without imposing the GL instability bound ( m 2 < 1 / 2 ℓ 2 ) , we find a very narrow bound of 0.161 < α < 0.1625 which is located inside tachyonic instability bound of α > 1 / 8 + m Φ 2 ℓ 2 / 6 for obtaining scalarized black holes where m Φ 2 is a scalar mass parameter.