Does the detection of primordial gravitational waves exclude low energy inflation?

Tomohiro Fujita, Ryo Namba, Yuichiro Tada

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)17-21
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume778
DOIs
Publication statusPublished - 2018 Mar 10
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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