Inflationary gravitational wave background as a tail effect
Finna-arvio
Inflationary gravitational wave background as a tail effect
The free propagator of a massless mode in an expanding universe can be written as a sum of two terms, a light cone and a tail part. The latter describes a subluminal (timelike) signal. We show that the inflationary gravitational wave background, influencing cosmic microwave background polarization and routinely used for constraining inflationary models through the so-called r ratio, originates exclusively from the tail part.
Tallennettuna:
Kieli |
englanti |
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Sarja | Physical Review D |
Aiheet | |
ISSN |
2470-0010 |