Higuchi, Atsushi, Lee, Yen Cheong, Nicholas, Jack R.
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...
Higuchi, Atsushi, Lee, Yen Cheong
We study conformally-coupled massive scalar field theory with the mass term treated as a perturbation in the expanding half of de Sitter spacetime as a toy model for comparing various perturbative...
How to use retarded Green's functions in de Sitter spacetime (2008)
Higuchi, Atsushi, Lee, Yen Cheong
We demonstrate in examples that the covariant retarded Green's functions in electromagnetism and linearized gravity work as expected in de Sitter spacetime. We first clarify how retarded Green's...