192 citations · 2.3k across the 49 of their papers we have counts for
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gr-qc2023★ 1 cited
Inflationary gravitational wave background as a tail effect
Niko Jokela, K. Kajantie, M. Laine +2
The free propagator of a massless mode in an expanding universe can be written as a sum of two terms, a lightcone and a tail part. The latter describes a subluminal (time-like) sig…
gr-qc2006★ 23 cited
Covariant generalization of cosmological perturbation theory
Kari Enqvist, Janne Hogdahl, Sami Nurmi +1
We present an approach to cosmological perturbations based on a covariant perturbative expansion between two worldlines in the real inhomogeneous universe. As an application, at an…