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

Authors

Edition

Journal of Cosmology and Astroparticle Physics, GB - Spojené království Velké Británie a, 2015, 1475-7516

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Organization unit

Faculty of Philosophy and Science in Opava

DOI

UT WoS

000359215400049

Keywords in English

modified gravity; gravitational lensing; no-horizon spacetimes

Tags

Tags

International impact, Reviewed

Links

GB14-37086G, research and development project.
Změněno: 27/1/2021 11:15, Mgr. Pavlína Jalůvková

Abstract

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