Can string theory answer why the Yukawa couplings or the v.e.v.s.have the values they have in our Universe? I mean, why can string theory answer( and EXPLAIN) the question of why the top coupling to the Higgs is so big in comparison with the remaining particles? And with respect to fermions, can the Higgs coupling explain the tiny neutrino masses withour invoking Majorana conditions on the fermion fields? That is, can the Higgs sector select to be fine-tune the neutrinos to Majoranas with low couplings (excepting possible right-handed heavy neutrinos or sterile neutrinos) and heavy quarks to high couplings by some reason?
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