Journal article
Inflation in a scale-invariant universe
- Abstract:
- A scale-invariant universe can have a period of accelerated expansion at early times: inflation. We use a frame-invariant approach to calculate inflationary observables in a scale-invariant theory of gravity involving two scalar fields: the spectral indices, the tensor-to-scalar ratio, the level of isocurvature modes, and non-Gaussianity. We show that scale symmetry leads to an exact cancellation of isocurvature modes and that, in the scale symmetry–broken phase, this theory is well described by a single scalar-field theory. We find the predictions of this theory strongly compatible with current observations.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
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(Preview, Accepted manuscript, pdf, 325.8KB, Terms of use)
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- Publisher copy:
- 10.1103/PhysRevD.97.123516
Authors
- Publisher:
- American Physical Society
- Journal:
- Physical Review D More from this journal
- Volume:
- 97
- Issue:
- 12
- Article number:
- 123516
- Publication date:
- 2018-06-13
- Acceptance date:
- 2018-05-26
- DOI:
- EISSN:
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2470-0029
- ISSN:
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2470-0010
- Keywords:
- Pubs id:
-
pubs:826623
- UUID:
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uuid:8b199fe6-fa5e-4e50-9ddb-7873d6186d38
- Local pid:
-
pubs:826623
- Source identifiers:
-
826623
- Deposit date:
-
2018-03-11
Terms of use
- Copyright holder:
- American Physical Society
- Copyright date:
- 2018
- Notes:
- Copyright © 2018 American Physical Society. This is the accepted manuscript version of the article. The final version is available online from American Physical Society at: https://doi.org/10.1103/PhysRevD.97.123516
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