Suppressing isocurvature perturbations of QCD axion dark matter

Kwang Sik Jeong, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


We propose a novel mechanism to suppress the isocurvature perturbations of the QCD axion. The point is that the QCD interactions become strong at an intermediate or high energy scale in the very early Universe, if the Higgs field has a sufficiently large expectation value. The effective QCD scale can be even higher in the presence of extra colored particles. We show that the QCD axion then becomes so heavy during inflation that its isocurvature perturbations are significantly suppressed, thereby relaxing the constraint on the inflation scale.

Original languageEnglish
Pages (from-to)448-451
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number4-5
Publication statusPublished - 2013 Dec 18


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