Light from Reissner–Nordstrom–de Sitter black holes

2021/01/31 by Ion I. Cotǎescu, Ion I. Cotaescu · 1 citation
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Black Holes and Theoretical Physics #Black hole (networking) #Cosmology and Gravitation Theories #De Sitter universe #Extremal black hole #Geodesic #Geometry #Horizon #Mathematical physics #Observer (physics) #Photon #Photon sphere #Physics #Quantum mechanics #Redshift #Shadow (psychology) #Universe #White hole #de Sitter–Schwarzschild metric #gr-qc

paper · pdf · doi:10.1142/s0217732321501625

14 pages, 3 figures. arXiv admin note: text overlap with arXiv:2011.02434

arxiv created 2021/04/22 · openalex publication_date 2021/07/20 · arxiv updated 2021/08/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We derive for the first time the form of the spiral null geodesics around the photon sphere of the Reissner–Nordstrom black hole in the de Sitter expanding universe. Moreover, we obtain the principal parameter we need for deriving, according to our method [I. I. Cotăescu, Eur. Phys. J. C 81, 32 (2021)], the black hole shadow and the related redshift as measured by a remote observer situated in the asymptotic zone. We obtain thus a criterion of detecting charged black holes without peculiar velocities when one knows the mass, redshift and the black hole shadow.

Citations

• Light from Schwarzschild Black Holes in de Sitter expanding universe
• Quantum Fields in Curved Space
• Viewing the Shadow of the Black Hole at the Galactic Center
• A relation between distance and radial velocity among extra-galactic nebulae
• The physical meaning of the de Sitter invariants
• A Homogeneous Universe of Constant Mass and Increasing Radius accounting for the Radial Velocity of Extra-galactic Nebulae

Cited by

• Shadow and weak deflection angle of extended uncertainty principle black hole surrounded with dark matter