TY - JOUR
T1 - Suppressing isocurvature perturbations of QCD axion dark matter
AU - Jeong, Kwang Sik
AU - Takahashi, Fuminobu
N1 - Funding Information:
This work was supported by Grant-in-Aid for Scientific Research (C) (No. 23540283 ) [KSJ], Scientific Research on Innovative Areas (No. 24111702 [FT], No. 21111006 [FT], and No. 23104008 [KSJ and FT]), Scientific Research (A) (No. 22244030 and No. 21244033 ) [FT], and JSPS Grant-in-Aid for Young Scientists (B) (No. 24740135 ) [FT].
PY - 2013/12/18
Y1 - 2013/12/18
N2 - 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.
AB - 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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U2 - 10.1016/j.physletb.2013.10.061
DO - 10.1016/j.physletb.2013.10.061
M3 - Article
AN - SCOPUS:84888297136
SN - 0370-2693
VL - 727
SP - 448
EP - 451
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 4-5
ER -