The recent discovery of non-Schwarzschild black hole spacetimes has opened new directions of research in higher-derivative gravitational theories. However, despite intense analytical and numerical efforts, the link with the linearized theory is still poorly understood. In this work we address this point for the Einstein-Weyl Lagrangian, whose weak field limit is characterized by the standard massless graviton and a spin-2 ghost. We show that the strength of the Yukawa term at infinity determines the thermal properties of the black hole and the structure of the singularity near r = 0. Moreover, inspired by recent results in the Asymptotic Safety scenario we investigate the consequences of an imaginary ghost mass. In this case we find a countable set of solutions all characterized by spatial oscillations of typical wavelength determined by the mass of the spin-2 field.

Characterizing black hole metrics in quadratic gravity / Bonanno, Alfio; Silveravalle, Samuele Marco. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - ELETTRONICO. - 2019, 99:10.1501(2019). [10.1103/PhysRevD.99.101501]

Characterizing black hole metrics in quadratic gravity

Samuele, Silveravalle
2019-01-01

Abstract

The recent discovery of non-Schwarzschild black hole spacetimes has opened new directions of research in higher-derivative gravitational theories. However, despite intense analytical and numerical efforts, the link with the linearized theory is still poorly understood. In this work we address this point for the Einstein-Weyl Lagrangian, whose weak field limit is characterized by the standard massless graviton and a spin-2 ghost. We show that the strength of the Yukawa term at infinity determines the thermal properties of the black hole and the structure of the singularity near r = 0. Moreover, inspired by recent results in the Asymptotic Safety scenario we investigate the consequences of an imaginary ghost mass. In this case we find a countable set of solutions all characterized by spatial oscillations of typical wavelength determined by the mass of the spin-2 field.
2019
10.1501
Bonanno, Alfio; Silveravalle, Samuele Marco
Characterizing black hole metrics in quadratic gravity / Bonanno, Alfio; Silveravalle, Samuele Marco. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - ELETTRONICO. - 2019, 99:10.1501(2019). [10.1103/PhysRevD.99.101501]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/258661
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