Influence of quintessence dark energy on the shadow of black hole

• Published in: The European physical journal. C, Particles and fields Vol. 80; no. 11; pp. 1 - 14
• Main Authors: Zeng, Xiao-Xiong, Zhang, Hai-Qing
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.11.2020; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Accretion disks; Astronomy; Astrophysics and Cosmology; Black holes; Dark energy; Doppler effect; Elementary Particles; Emission; Hadrons; Heavy Ions; Horizon; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Photons; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quintessence (cosmology); Regular Article – Theoretical Physics; Shadows; String Theory
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-020-08656-7

We investigate the effects of quintessence dark energy on the shadows of black hole, surrounded by various profiles of accretions. For the thin-disk accretion, the images of the black hole comprises the dark region and bright region, including direct emission, lensing rings and photon rings. Although their details depend on the form of the emission, generically, direct emission plays a major role for the observed brightness of the black hole, while the lensing ring makes a small contribution and the photon ring makes a negligible contribution. The existence of a cosmological horizon also plays an important role in the shadows, since the observer in the domain of outer communications is near the cosmological horizon. For spherically symmetric accretion, static and infalling matters are considered. We find that the positions of photon spheres are the same for both static and infalling accretions. However, the observed specific intensity of the image for infalling accretion is darker than for static accretion, due to the Doppler effect of the infalling motion.