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The QCD axion with $f_a$ at an intermediate scale, 10**9-10**12 GeV, seems in conflict with the gravity spoil of global symmetries and may face the axionic domain wall problem.
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K. Choi and J.E. Kim, Domain walls in superstring models , Phys. Rev. Lett. 55
1985
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S. M. Barr and D. Seckel, Planck scale corrections to axion models , Phys. Rev. D 46
1997
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J.E. Kim, Constraints on very light axions from cavity experiments , Phys. Rev. D 58
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K.-S. Choi, I.-W. Kim and J. E. Kim, String compactification, QCD axion and axion-photon-photon coupling , JHEP 0703
2007
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J-H Huh, J.E. Kim, and B. Kyae, SU(5) flip × {}_{\rm flip}\times SU(5) ′
2009
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J. E. Kim and G. Carosi, Axions and the strong CP problem , Rev. Mod. Phys. 82
2010
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J.E. Kim, Abelian discrete symmetries 𝐙 N {\bf Z}_{N} and 𝐙 n R {\bf Z}_{nR} from string orbifolds , Phys. Lett. B 726
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J.E. Kim, Light pseudoscalars, particle physics, and cosmology , Phys. Rep. 150
1987
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J.J. Atick, L. Dixon, and A. Sen, String calculation of Fayet-Iliopoulos d d terms in arbitrary supersymmetric compactifications , Nucl. Phys. B 292
1987
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J. E. Kim, The strong CP problem in orbifold compactifications and an SU(3) × \times SU(2) × \times U(1) n
1988
Cited alongside, same era.
G.G. Raffelt, Bounds on exotic particle interactions from SN 1987a , Phys. Rev. Lett. 60
1989
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A. Casas, E.K. Katehou, and C. Munoz, U(1) Charges in orbifolds: Anomaly cancellation and phenomenological consequences , Nucl. Phys. B 317
1989
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J.E. Kim, arXiv:1603.02145 [hep-ph]
Cited in the paper.
2013
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2013
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For a review, see, J.E. Kim, Y.K. Semertzidis, and S. Tsujikawa, Bosonic coherent motions in the Universe , Front. Phys. 2
2014
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P. Sikivie, Of axions, domain walls and the early Universe , Phys. Rev. Lett. 48
2014
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J. E. Kim, Calculation of axion–photon–photon coupling in string theory , Phys. Lett. B 735
2014
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