Intersection of black hole theory and quantum chromodynamics: the gluon   propagator corresponding to linear confinement at large distances and   relativistic bound states in the confining SU(N)-Yang-Mills fields
  The exact nonperturbative confining solutions of the SU(3)-Yang-Mills equations recently obtained by author in Minkowski spacetime with the help of the black hole theory techniques are analysed and on the basis of them the gluon propagator corresponding to linear confinement at large distances (small momenta) is constructed in a nonperturbative way. At small distances (large momenta) the resulting propagator passes on to the standard (nonperturbative) gluon propagator used in the perturbative quantum chromodynamics (QCD). The results suggest some scenario of linear confinement for mesons and quarkonia which is also outlined. As a consequence there arises a motivation for studying the relativistic bound states in the above confining SU($N$)-Yang-Mills fields. This possiblity is realized for $N=2,3,4$ with the aid of the black hole theory results about spinor fields on black holes with a subsequent application to the charmonium spectrum in the most important physical case N=3. Incidentally uniqueness of the confining solutions is discussed and a comparison with the nonrelativistic potential approach is given. 
Yu. P. Goncharov (Sankt-Petersburg State Polytechnical University,   Russia)