https://doi.org/10.1140/epjc/s10052-020-08822-x
Regular Article - Theoretical Physics
Light from Schwarzschild black holes in de Sitter expanding universe
West University of Timişoara, V. Pârvan Ave. 4, 300223, Timisoara, Romania
Received:
5
November
2020
Accepted:
29
December
2020
Published online:
16
January
2021
A new method is applied for deriving simultaneously the redshift and shadow of a Schwarzschild black hole moving freely in the de Sitter expanding universe as recorded by a remote co-moving observer. This method is mainly algebraic, focusing on the transformation of the conserved quantities under the de Sitter isometry relating the black hole co-moving frame to observer’s one. Hereby one extracts the general expressions of the redshifts and shadows of the black holes having peculiar velocities but their expressions are too extended to be written down here. Therefore, only some particular cases and intuitive expansions are presented while the complete results are given in an algebraic code (Cotăescu in Maple code BH01, https://physics.uvt.ro/~cota/CCFT/codes, 2020).
© The Author(s) 2021
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