G. Dvali, C. Gomez and D. Lüst
Within the framework as used in the preceeding paper the semi-classical black hole bound on the number of particle species Nspecies is revised. It is shown that unlike the bound on global charge, the bound on species survives in the quantum picture and gives rise to a new fundamental length-scale, beyond which the resolution of species identities is impossible. This finding nullifies the so-called species problem. This scale sets the size of the lightest quantum black hole in the theory, the Planckion.