1. Strong gravitational lensing in a black-hole spacetime dominated by dark energy.
- Author
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Chikun Ding, Changqing Liu, Yuanyuan Xiao, Liqun Jiang, and Rong-Gen Cai
- Subjects
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GRAVITATIONAL lenses , *BLACK holes , *SPACETIME , *DARK energy , *GRAVITATIONAL fields , *ASTRONOMICAL observations , *COSMOLOGICAL constant - Abstract
We study the influence of phantom fields on strong field gravitational lensing. Supposing that the gravitational field of the supermassive central object of the Galaxy is described by a phantom black hole metric, we estimate the numerical values of the coefficients and observations and find that the influence of the phantom fields is somewhat similar to that of the electric charge in a Reissner-Nordström black hole, i.e., the deflect angle and angular separation increase with the phantom constant b. However, other observations are contrary to the Reissner-Nordström case and show the effects of dark energy, such as (i) compressing the usual black hole and more powerfully attracting photons, (ii) making the relativistic Einstein ring larger than that of the usual black hole, and (iii) not weakening the usual relative magnitudes, which will facilitate observations. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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