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. Lastly, ee find the predictions of this theory strongly compatible with current observations.
- Authors:
-
[1];
[2];
[3];
- Univ. of Oxford, Oxford (United Kingdom)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- ETH Zurich, Zurich (Switzerland)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1437397
- Alternate Identifier(s):
- OSTI ID: 1454351
- Report Number(s):
- FERMILAB-PUB-18-079-T; arXiv:1802.06069
Journal ID: ISSN 2470-0010; PRVDAQ; 1655609; TRN: US1900321
- Grant/Contract Number:
- AC02-07CH11359
- Resource 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)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Ferreira, Pedro G., Hill, Christopher T., Noller, Johannes, and Ross, Graham G. Inflation in a scale-invariant universe. United States: N. p., 2018.
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:https://doi.org/10.1103/PhysRevD.97.123516
Ferreira, Pedro G., Hill, Christopher T., Noller, Johannes, and Ross, Graham G. Wed .
"Inflation in a scale-invariant universe". United States. doi:https://doi.org/10.1103/PhysRevD.97.123516. https://www.osti.gov/servlets/purl/1437397.
@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}
}
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Figures / Tables:
FIG. 1: Plot of $n$$S$ vs. $α$1. Note that the spectral index of scalar perturbations does not depend on $α$2 at leading order in $α$1, which is unlike the result for $r$ above.
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