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Title: Inflation in a scale-invariant universe

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. Lastly, ee find the predictions of this theory strongly compatible with current observations.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ;  [1]
  1. Univ. of Oxford, Oxford (United Kingdom)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. ETH Zurich, Zurich (Switzerland)
Publication Date:
Report Number(s):
FERMILAB-PUB-18-079-T; arXiv:1802.06069
Journal ID: ISSN 2470-0010; PRVDAQ; 1655609
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 12; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1437397
Alternate Identifier(s):
OSTI ID: 1454351

Ferreira, Pedro G., Hill, Christopher T., Noller, Johannes, and Ross, Graham G.. Inflation in a scale-invariant universe. United States: N. p., Web. doi:10.1103/PhysRevD.97.123516.
Ferreira, Pedro G., Hill, Christopher T., Noller, Johannes, & Ross, Graham G.. Inflation in a scale-invariant universe. United States. doi:10.1103/PhysRevD.97.123516.
Ferreira, Pedro G., Hill, Christopher T., Noller, Johannes, and Ross, Graham G.. 2018. "Inflation in a scale-invariant universe". United States. doi:10.1103/PhysRevD.97.123516.
@article{osti_1437397,
title = {Inflation in a scale-invariant universe},
author = {Ferreira, Pedro G. and Hill, Christopher T. and Noller, Johannes and Ross, Graham G.},
abstractNote = {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. Lastly, ee find the predictions of this theory strongly compatible with current observations.},
doi = {10.1103/PhysRevD.97.123516},
journal = {Physical Review D},
number = 12,
volume = 97,
place = {United States},
year = {2018},
month = {6}
}