Inflationary gravitational wave background as a tail effect
Abstract
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.
Main Authors
Format
Articles
Research article
Published
2023
Series
Subjects
Publication in research information system
Publisher
American Physical Society (APS)
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202312208427Use this for linking
Review status
Peer reviewed
ISSN
2470-0010
DOI
https://doi.org/10.1103/PhysRevD.108.L101503
Language
English
Published in
Physical Review D
Citation
- 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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Copyright© 2023 American Physical Society