Null geodesics and shadow of a rotating black hole in extended Chern-Simons modified gravity

Journal Article · Tue Jun 15 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.124045· OSTI ID:21413230

Amarilla, Leonardo ^[1]; Eiroa, Ernesto F ^[2]; Giribet, Gaston ^[3]

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1. Facultad de Ciencias Astronomicas y Geofisicas, Universidad Nacional de La Plata, Paseo del Bosque, 1900, La Plata (Argentina)
2. Instituto de Astronomia y Fisica del Espacio, C.C. 67 Suc. 28, 1428, Buenos Aires (Argentina)
3. Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon 1, 1428, Buenos Aires (Argentina)

The Chern-Simons modification to general relativity in four dimensions consists of adding to the Einstein-Hilbert term a scalar field that couples to the first-class Pontryagin density. In this theory, which has attracted considerable attention recently, the Schwarzschild metric persists as an exact solution, and this is why this model resists several observational constraints. In contrast, the spinning black hole solution of the theory is not given by the Kerr metric but by a modification of it, so far only known for slow rotation and small coupling constant. In the present paper, we show that, in this approximation, the null geodesic equation can be integrated, and this allows us to investigate the shadow cast by a black hole. We discuss how, in addition to the angular momentum of the solution, the coupling to the Chern-Simons term deforms the shape of the shadow.

• OSTI ID: 21413230
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 12 Vol. 81; 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
ANGULAR MOMENTUM
APPROXIMATIONS
BANACH SPACE
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CALCULATION METHODS
COUPLING
COUPLING CONSTANTS
DENSITY
EQUATIONS
EXACT SOLUTIONS
FIELD THEORIES
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SIMULATION
SPACE