Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-09-07
Class.Quant.Grav.27:105010,2010
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
12 pages, 24 figures. V2: 10 pages, 13 figures, significant changes, matches published version
Scientific paper
10.1088/0264-9381/27/10/105010
A promising extension of general relativity is Chern-Simons (CS) modified gravity, in which the Einstein-Hilbert action is modified by adding a parity-violating CS term, which couples to gravity via a scalar field. In this work, we consider the interesting, yet relatively unexplored, dynamical formulation of CS modified gravity, where the CS coupling field is treated as a dynamical field, endowed with its own stress-energy tensor and evolution equation. We consider the possibility of observationally testing dynamical CS modified gravity by using the accretion disk properties around slowly-rotating black holes. The energy flux, temperature distribution, the emission spectrum as well as the energy conversion efficiency are obtained, and compared to the standard general relativistic Kerr solution. It is shown that the Kerr black hole provide a more efficient engine for the transformation of the energy of the accreting mass into radiation than their slowly-rotating counterparts in CS modified gravity. Specific signatures appear in the electromagnetic spectrum, thus leading to the possibility of directly testing CS modified gravity by using astrophysical observations of the emission spectra from accretion disks.
Harko Tiberiu
Kovács Zoltán
Lobo Francisco S. N.
No associations
LandOfFree
Thin accretion disk signatures in dynamical Chern-Simons modified gravity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Thin accretion disk signatures in dynamical Chern-Simons modified gravity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thin accretion disk signatures in dynamical Chern-Simons modified gravity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-296227