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Title: Scale Independent $R^2$ Inflation

Abstract

Weyl (scale) invariant theories of scalars and gravity can generate all mass scales spontaneously. In this paper we study a particularly simple version -- scale invariant $R^2$ gravity -- and show that, during an inflationary period, it leads to fluctuations which, for a particular parameter choice, are almost indistinguishable from normal $R^2$ inflation. Current observations place tight constraints on the primary coupling constant of this theory and predict a tensor to scalar ratio, $0.0033 > r > 0.0026$, which is testable with the next generation of cosmic microwave background experiments.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]
  1. Oxford U.
  2. Fermilab
  3. Zurich, ETH
  4. Oxford U., Theor. Phys.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1546015
Report Number(s):
arXiv:1906.03415; FERMILAB-PUB-19-244-T; OUTP-19-07P
1738976
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Ferreira, Pedro G., Hill, Christopher T., Noller, Johannes, and Ross, Graham G. Scale Independent $R^2$ Inflation. United States: N. p., 2019. Web.
Ferreira, Pedro G., Hill, Christopher T., Noller, Johannes, & Ross, Graham G. Scale Independent $R^2$ Inflation. United States.
Ferreira, Pedro G., Hill, Christopher T., Noller, Johannes, and Ross, Graham G. Sat . "Scale Independent $R^2$ Inflation". United States. https://www.osti.gov/servlets/purl/1546015.
@article{osti_1546015,
title = {Scale Independent $R^2$ Inflation},
author = {Ferreira, Pedro G. and Hill, Christopher T. and Noller, Johannes and Ross, Graham G.},
abstractNote = {Weyl (scale) invariant theories of scalars and gravity can generate all mass scales spontaneously. In this paper we study a particularly simple version -- scale invariant $R^2$ gravity -- and show that, during an inflationary period, it leads to fluctuations which, for a particular parameter choice, are almost indistinguishable from normal $R^2$ inflation. Current observations place tight constraints on the primary coupling constant of this theory and predict a tensor to scalar ratio, $0.0033 > r > 0.0026$, which is testable with the next generation of cosmic microwave background experiments.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {6}
}