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Models with one warped and two unwarped extra dimensions allow for thesolution of a number of open questions in particle physics. They can be used tosolve the hierarchy problem in the same sense as Randall-Sundrum extradimensions, they incorporate the Randall-Sundrum approach to flavor, and theygenerate a dark matter candidate via Kaluza-Klein parity in the flat extradimensions. In this paper, we examine the models AdS_5 x T_2 and AdS_5 x S_2,deriving the Kaluza-Klein spectrum for fermions propagating in the bulk. Whilethe toroidal model allows for a chiral zero mode, we find that the positivecurvature of the spherical model disallows all zero modes without furthermodifications.

Fermions in Randall-Sundrum Models with Two Additional Unwarped Extra Dimensions