  Models with two right-handed neutrinos are able to accommodate solar and
atmospheric neutrino oscillation observations as well as a mechanism for the
baryon asymmetry of the universe. While economical in terms of the required new
states beyond the Standard Model, given that there are three generations of the
other leptons and quarks this raises the question concerning why only two
right-handed neutrino states should exist. Here we develop from first
principles a fundamental unification scheme based upon a direct generalisation
and analysis of a simple proper time interval with a structure beyond that of
local 4-dimensional spacetime and further augmenting that of models with extra
spatial dimensions. This theory leads to properties of matter fields that
resemble the Standard Model, with an intrinsic left-right asymmetry which is
particularly marked for the neutrino sector. It will be shown how the theory
can provide a foundation for the natural incorporation of two right-handed
neutrinos and may in principle underlie firm predictions both in the neutrino
sector and for other new physics beyond the Standard Model. While connecting
with contemporary and future experiments the origins of the theory are
motivated in a similar spirit as for the earliest unified field theories.
