TY - JOUR
T1 - Strong CP problem and axion dark matter with small instantons
AU - Kitano, Ryuichiro
AU - Yin, Wen
N1 - Publisher Copyright:
© 2021, The Author(s).
PY - 2021/7
Y1 - 2021/7
N2 - The axion mass receives a large correction from small instantons if the QCD gets strongly coupled at high energies. We discuss the size of the new CP violating phases caused by the fact that the small instantons are sensitive to the UV physics. We also discuss the effects of the mass correction on the axion abundance of the Universe. Taking the small-instanton contributions into account, we propose a natural scenario of axion dark matter where the axion decay constant is as large as 1015-16 GeV. The scenario works in the high-scale inflation models.
AB - The axion mass receives a large correction from small instantons if the QCD gets strongly coupled at high energies. We discuss the size of the new CP violating phases caused by the fact that the small instantons are sensitive to the UV physics. We also discuss the effects of the mass correction on the axion abundance of the Universe. Taking the small-instanton contributions into account, we propose a natural scenario of axion dark matter where the axion decay constant is as large as 1015-16 GeV. The scenario works in the high-scale inflation models.
KW - Beyond Standard Model
KW - Compactification and String Models
KW - Cosmology of Theories beyond the SM
KW - CP violation
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U2 - 10.1007/JHEP07(2021)078
DO - 10.1007/JHEP07(2021)078
M3 - Article
AN - SCOPUS:85110724069
VL - 2021
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1126-6708
IS - 7
M1 - 78
ER -