1. Actually, in the gravitational case—because of the identity of inertial and gravitational masses—the particle behaviour can be easily connected to space-time geometry. On the contrary, in the present («strong») case that behaviour appears to depend on the particle mass. However, in theinner «world» of the hadron, one may preliminarly assume all quarks to have not only the same «strong charge», but also the same mass (which in the following will be taken to be about 1/2 of the nucleon mass). The fact of considering (so as we shall do) the hadron as a «closed universe», basedhowever on the strong field rather than on the gravitational field, is supported also by the observation that the ratio Universe radius over nucleon radius is 1036/10−15=1041, exactly equal to the ratio strong-interaction strength over gravitational-interaction strength (see the following). That equality will be explained in a forthcoming paper, together with the clarification of the fact that the Universe mass is ∼(1041)2=1032 times the nucleon mass.
2. See,e.g.,V. Berzi andE. Recami:Phys. Rev.,160, 1264 (1967) and references therein.
3. D. K. Roos:Nuovo Cimento,8 A, 603 (1972) and references therein.
4. See,e.g.,C. W. Misner, K. S. Thorne andJ. A. Wheeler:Gravitation (San Francisco, Cal., 1973), and references therein.
5. R. Mignani andE. Recami: preprint IC/75/88 (ICTP, Trieste, July 1975), to appear inNuovo Cimento, A;E. Recami andR. Mignani:Riv. Nuovo Cimento,4, 247 (1974).