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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...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Accepted Manuscript

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Publisher copy:
10.1103/PhysRevD.97.123516

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Institution:
University of Oxford
Division:
MPLS Division
Department:
Physics; Astrophysics
Oxford college:
Oriel College
Role:
Author
Publisher:
American Physical Society Publisher's website
Journal:
Physical Review D Journal website
Volume:
97
Issue:
12
Pages:
Article: 123516
Publication date:
2018-06-13
Acceptance date:
2018-05-26
DOI:
EISSN:
2470-0029
ISSN:
2470-0010
Pubs id:
pubs:826623
URN:
uri:8b199fe6-fa5e-4e50-9ddb-7873d6186d38
UUID:
uuid:8b199fe6-fa5e-4e50-9ddb-7873d6186d38
Local pid:
pubs:826623

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