Inflationary gravitational wave background as a tail effect
Jokela, N., Kajantie, K., Sarkkinen, M., Laine, M., & Nurmi, S. (2023). Inflationary gravitational wave background as a tail effect. Physical Review D, 108, Article L101503. https://doi.org/10.1103/PhysRevD.108.L101503
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2023Copyright
© 2023 American Physical Society
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.
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American Physical Society (APS)ISSN Search the Publication Forum
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