Perturbations of Schwarzschild black holes in dynamical Chern-Simons modified gravity

Journal Article · Tue Sep 15 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.064008· OSTI ID:21322721

Cardoso, Vitor; Gualtieri, Leonardo ^[1]

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1. Centro Multidisciplinar de Astrofisica - CENTRA, Departamento de Fisica, Instituto Superior Tecnico, Avenida Rovisco Pais 1, 1049-001 Lisboa (Portugal)

Dynamical Chern-Simons modified gravity is an attractive, yet relatively unexplored, candidate to an alternative theory of gravity. The dynamical Chern-Simons correction couples a dynamical scalar field to the gravitational field. In this framework, we analyze the perturbation formalism and stability properties of spherically symmetric black holes. Assuming that no background scalar field is present, gravitational perturbations with polar and axial parities decouple. We find no effect of the Chern-Simons coupling on the polar sector, while axial perturbations couple to the Chern-Simons scalar field. The axial sector can develop strong instabilities if the coupling parameter {beta}, associated to the dynamical coupling of the scalar field, is small enough; this yields a constraint on {beta} which is much stronger than the constraints previously known in the literature.

• OSTI ID: 21322721
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
BLACK HOLES
CORRECTIONS
COUPLING
DISTURBANCES
GRAVITATION
GRAVITATIONAL FIELDS
INSTABILITY
PARITY
PERTURBATION THEORY
QUANTUM FIELD THEORY
QUANTUM GRAVITY
SCALAR FIELDS
SCHWARZSCHILD METRIC
STABILITY
SYMMETRY