On a connection between gravitation and quantum chromodynamics
  In this paper we point out a remarkable numerical relation between the large scale parameters of gravitation G_N and H_0 and the two fundamental parameters of quantum cromodynamics alpha_{QCD} and Lambda_{QCD}. With this remark we make the conjecture that Newton's gravitational constant could show an energy dependence analogous to alpha_{QCD}. 
J.A. Martins Simoes