Abstract
On the basis of supersymmetric SU(5) scheme, axion models are investigated by taking into account constraints extracted from cosmology (domain wall problem) and astrophysics (invisibility of axion). A global U(1) axial symmetry is assumed to break down spontaneously at an intermediate mass scale in the tree approximation. Two minimal cases are examined by working the Peccei-Quinn mechanism in R-symmetry peculiar to SUSY theories and in the ordinary chiral phase transformations. The former case suggests the number of generations to be four, while the latter yields a certain relation among P-Q charges, in order to get rid of the domain structure.
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