More on the covariant retarded Green's function for the electromagnetic field in de Sitter spacetime

Details More on the covariant retarded Green's function for the electromagnetic field in de Sitter spacetime More on the covariant retarded Green's function for the electromagnetic field in de Sitter spacetime

2009-07-23

arxiv.org/abs/0907.4002v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, addendum to PRD 78, 084031 (2008) [arXiv:0808.0642]

Scientific paper

In a recent paper (Phys. Rev. D78, 084031 (2008), arXiv:0808.0642, Ref. [1]) it was shown in examples that the covariant retarded Green's functions in particular gauges for electromagnetism and linearized gravity can be used to reproduce field configurations correctly in spite of the spacelike nature of past infinity in de Sitter spacetime. In this paper we extend the work of Ref. [1] concerning the electromagnetic field and show that the covariant retarded Green's function with an arbitrary value of the gauge parameter reproduces the electromagnetic field from two opposite charges at antipodal points of de Sitter spacetime.

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