Instantons and Monopoles for Nonperturbative QCD
  We study the nonperturbative QCD in terms of topological objects, i.e., QCD-monopoles and instantons. In the 't Hooft abelian gauge, QCD is reduced into an abelian gauge theory with QCD-monopoles, and the confinement mechanism can be understood with the dual superconductor picture. Regarding the flux-tube ring as the glueball, we study the glueball properties by combining the dual Ginzburg-Landau theory and the Nambu-Goto action. We find the strong correlations between instantons and monopole world-lines both in the continuum theory and in the lattice QCD. The nonperturbative QCD vacuum is filled with instantons and monopoles, and dense instantons generate a macroscopic network of the monopole world-line, which would be responsible for the confinement force in the infrared region. 
H. Suganuma(RCNP), F. Araki(RCNP), M. Fukushima(RCNP), H.Ichie(RCNP),   Y. Koma(RCNP), S. Sasaki(RCNP), A. Tanaka(RCNP), H. ...