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Photon surfaces, shadows, and accretion disks in gravity with minimally coupled scalar fieldстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Bogush Igor, Gal’tsov Dmitri, Gyulchev Galin, Kobialko Kirill, Nedkova Petya, Vetsov Tsvetan
- Журнал: Physical Review D
- Том: 106
- Номер: 2
- Год издания: 2022
- Издательство: American Physical Society
- Местоположение издательства: United States
- Номер статьи: 024034
- DOI: 10.1103/physrevd.106.024034
- Аннотация: In this article, we conduct a sequential study of possible observable images of black hole simulators described by two recently obtained rotating geometries in Einstein gravity, minimally coupled to a scalar field. One of them, “Kerr-like,” can be seen as a legitimate alternative to the rotating Fisher-Janis-Newman-Winicour solution, and the other (TSL) is a scalar generalization of the Tomimatsu-Sato-like solution. Unlike the previous version of the rotating Fisher-Janis-Newman-Winicour solution, these solutions do indeed satisfy the system’s equations of motion. Our study includes both analytical and numerical calculations of equatorial circular orbits, photon regions, gravitational shadows, and radiation from thin accretion disks for various values of the object’s angular momentum and scalar charge. The TSL solution was found to simulate Kerr for all valid parameter values with high accuracy. The maximum difference between the deviations of shadows from a circle for the Kerr and TSL cases does not exceed 1% and fits into the experimental observational data M87* and Sgr A*. However, near-extreme objects show two times smaller peak values of the observed outflow luminosity of the accretion disk than for the Kerr black hole. The Kerr-like solution cannot be ruled out by the experimental data for small values of the scalar charge either. As the scalar charge increases, the optical properties change dramatically. The shadow can become multiply connected, strongly oblate, and the photon region does not hide the singularity, so it should be classified as a strong singularity.
- Добавил в систему: Кобялко Кирилл Владимирович