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We propose an infrared effective theory of quark confinement developing the 't Hooft's idea of abelian projection. QCD is regarded as a U(1) ×U(1) abelian gauge theory with magnetic monopoles. The effective theory contains dual abelian vector fields and complex scalar monopole fields in addition to quarks and gluons. A static potential between quarks or between gluons is mainly composed of the linear and the Yukawa interaction. A relation VQQ = VQQ/2 is derived with regard to the static potentials of quark-quark and quark-antiquark. Our model predicts the existence of neutral axial-vector bosons and heavy scalar bosons both of which are not composed of quarks.
Maedan et al. (Sun,) studied this question.