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Almost maximally broken permutation symmetry for neutrino mass matrix
Kyungsik Kang, Sin Kyu Kang, Jihn E. Kim +1
Assuming three light neutrinos are Majorana particles, we propose mass matrix ansatz for the charged leptons and Majorana neutrinos with family symmetry broken into $S_{1}…
Can Strong QCD in the Early Universe Raise the Axion Decay Constant?
Jihn E. Kim
We report that the hypothesis that the upper bound on the axion decay constant can be moved up beyond GeV in models with a stronger QCD in the early universe is not reali…
Cosmological Implications of Radiatively Generated Axion Scale
K. Choi, E. J. Chun, J. E. Kim
We study cosmological implications of supersymmetric axion models in which the axion scale is generated radiatively. Such models lead to the so-called thermal inflation and subsequ…
Axion Cosmology with a Stronger QCD in the Early Universe
Kiwoon Choi, Hang Bae Kim, Jihn E. Kim
We examine in the context of supersymmetric models whether the usual cosmological upper bound on the axion decay constant can be relaxed by assuming a period of stronger QCD in the…