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Building up on our earlier work [1,2], we show the possibility of generating"light" fermion mass scales of MeV-GeV range (possibly related to first twogenerations of quarks/leptons) as well as eV (possibly related to first twogenerations of neutrinos) in type IIB string theory compactified onSwiss-Cheese orientifolds in the presence of a mobile space-time fillingD3-$brane restricted to (in principle) stacks of fluxed D7-branes wrapping the"big" divisor \Sigma_B. This part of the paper is an expanded version of thelatter half of section 3 of a published short invited review [3] written up byone of the authors [AM]. Further, we also show that there are no SUSY GUT-typedimension-five operators corresponding to proton decay, as well as estimate theproton lifetime from a SUSY GUT-type four-fermion dimension-six operator to be10^{61} years. Based on GLSM calculations in [1] for obtaining the geometricKaehler potential for the "big divisor", using further the Donaldson'salgorithm, we also briefly discuss in the first of the two appendices,obtaining a metric for the Swiss-Cheese Calabi-Yau used, that becomes Ricciflat in the large volume limit.

On 'Light' Fermions and Proton Stability in 'Big Divisor' D3/D7 Swiss Cheese Phenomenology