QCD axion window and false vacuum Higgs inflation

Hiroki Matsui, Fuminobu Takahashi, Wen Yin

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The abundance of the QCD axion is known to be suppressed if the Hubble parameter during inflation, Hinf , is lower than the QCD scale, and if the inflation lasts sufficiently long. We show that the tight upper bound on the inflation scale can be significantly relaxed if the eternal old inflation is driven by the standard-model Higgs field trapped in a false vacuum at large field values. Specifically, Hinf can be larger than 100 GeV if the false vacuum is located above the intermediate scale. We also discuss the slow-roll inflation after the tunneling from the false vacuum to the electroweak vacuum.

Original languageEnglish
Article number154
JournalJournal of High Energy Physics
Issue number5
Publication statusPublished - 2020 May 1


  • Beyond Standard Model
  • Cosmology of Theories beyond the SM
  • Higgs Physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'QCD axion window and false vacuum Higgs inflation'. Together they form a unique fingerprint.

Cite this