TY - JOUR
T1 - Does the detection of primordial gravitational waves exclude low energy inflation?
AU - Fujita, Tomohiro
AU - Namba, Ryo
AU - Tada, Yuichiro
N1 - Funding Information:
We would like to thank Emanuela Dimastrogiovanni, Matteo Fasiello, Shinji Mukohyama, Marco Peloso, Matthew Reece, Martin Sloth, Henry Tye and Yi Wang for useful discussions and correspondences. TF acknowledges the support by Grant-in-Aid for JSPS Fellows No. 29-9103 . RN is supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and by the Lorne Trottier Chair in Astrophysics and Cosmology at McGill University . YT is supported by Japan Society for the Promotion of Science Research Fellowship for Young Scientists and grants from Région Île-de-France .
Funding Information:
We would like to thank Emanuela Dimastrogiovanni, Matteo Fasiello, Shinji Mukohyama, Marco Peloso, Matthew Reece, Martin Sloth, Henry Tye and Yi Wang for useful discussions and correspondences. TF acknowledges the support by Grant-in-Aid for JSPS Fellows No. 29-9103. RN is supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and by the Lorne Trottier Chair in Astrophysics and Cosmology at McGill University. YT is supported by Japan Society for the Promotion of Science Research Fellowship for Young Scientists and grants from Région Île-de-France.
Publisher Copyright:
© 2017 The Authors
PY - 2018/3/10
Y1 - 2018/3/10
N2 - We show that a detectable tensor-to-scalar ratio (r≥10−3) on the CMB scale can be generated even during extremely low energy inflation which saturates the BBN bound ρinf≈(30MeV)4. The source of the gravitational waves is not quantum fluctuations of graviton but those of SU(2) gauge fields, energetically supported by coupled axion fields. The curvature perturbation, the backreaction effect and the validity of perturbative treatment are carefully checked. Our result indicates that measuring r alone does not immediately fix the inflationary energy scale.
AB - We show that a detectable tensor-to-scalar ratio (r≥10−3) on the CMB scale can be generated even during extremely low energy inflation which saturates the BBN bound ρinf≈(30MeV)4. The source of the gravitational waves is not quantum fluctuations of graviton but those of SU(2) gauge fields, energetically supported by coupled axion fields. The curvature perturbation, the backreaction effect and the validity of perturbative treatment are carefully checked. Our result indicates that measuring r alone does not immediately fix the inflationary energy scale.
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U2 - 10.1016/j.physletb.2017.12.014
DO - 10.1016/j.physletb.2017.12.014
M3 - Article
AN - SCOPUS:85043706811
SN - 0370-2693
VL - 778
SP - 17
EP - 21
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -