Suppressing Isocurvature Perturbations of QCD Axion Dark Matter
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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.
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Forward citations
Cited by 3 Pith papers
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Inflaton-gluon coupling raises the QCD scale early in inflation to eliminate axion isocurvature modes, selecting plateau inflation models for viable QCD axion dark matter.
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Isocurvature-Free QCD Axion Dark Matter from Inflaton-Driven Early QCD: the Necessity of Inflationary Plateaus
Inflaton-gluon coupling enables isocurvature-free QCD axion dark matter via early confinement and selects plateau inflation (p≥2) over monomial models.
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