Speaker
Description
Warped extra dimensions can address both the Planck-weak and flavor hierarchies of the Standard
Model (SM). In this paper we discuss the SM neutrino mass generation in a scenario in which a SM
singlet bulk fermion — coupled to the Higgs and the lepton doublet near the IR brane — is given
a Majorana mass of order the Planck scale on the UV brane. Despite the resemblance to a type I
seesaw mechanism, a careful investigation based on the mass basis for the singlet 4D modes reveals
a very different picture. Namely, the SM neutrino masses are generated dominantly by the exchange
of the TeV-scale mass eigenstates of the singlet, that are pseudo-Dirac and have a sizable Higgs-
induced mixing with the SM doublet neutrino: remarkably, in warped 5D models the anticipated
type I seesaw morphs into a natural realization of the so-called “inverse” seesaw. This understanding
uncovers an intriguing and direct link between neutrino mass generation (and possibly leptogenesis)
and TeV-scale physics. We also perform estimates using the dual CFT picture of our framework,
which back-up our 5D calculation.
Summary
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