Phenomenological issues in TeV scale gravity with light neutrino masses

The possible existence of bulk singlet neutrinos in the scenario with large compactified dimensions and low string scale M* has important consequences for low-energy observables. We demonstrate that intergenerational mass spl itting and mixing lead to the effective violation of the lepton universalit y and flavor changing processes in charged lepton sector. Current experimen tal constraints push M* to the scale of 10 TeV over most of the interesting range for neutrino mass splitting. (C) 1999 Published by Elsevier Science B.V. All rights reserved.