J
2015
Gravitational lensing and ghost images in the regular Bardeen no-horizon spacetimes
SCHEE, Jan and Zdeněk STUCHLÍK
Basic information
Original name
Gravitational lensing and ghost images in the regular Bardeen no-horizon spacetimes
Edition
Journal of Cosmology and Astroparticle Physics, GB - Spojené království Velké Británie a, 2015, 1475-7516
Other information
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Confidentiality degree
není předmětem státního či obchodního tajemství
Organization unit
Faculty of Philosophy and Science in Opava
Keywords in English
modified gravity; gravitational lensing; no-horizon spacetimes
Tags
International impact, Reviewed
Links
GB14-37086G, research and development project.
V originále
We study deflection of light rays and gravitational lensing in the regular Bardeen no-horizon spacetimes. Flatness of these spacetimes in the central region implies existence of interesting optical effects related to photons crossing the gravitational field of the no-horizon spacetimes with low impact parameters. These effects occur due to existence of a critical impact parameter giving maximal deflection of light rays in the Bardeen no-horizon spacetimes. We give the critical impact parameter in dependence on the specific charge of the spacetimes, and discuss "ghost" direct and indirect images of Keplerian discs, generated by photons with low impact parameters. The ghost direct images can occur only for large inclination angles of distant observers, while ghost indirect images can occur also for small inclination angles. We determine the range of the frequency shift of photons generating the ghost images and determine distribution of the frequency shift across these images. We compare
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