Aspects of the Bosonic Spectral Action
  A brief description of the elements of noncommutative spectral geometry as an
approach to unification is presented. The physical implications of the doubling
of the algebra are discussed. Some high energy phenomenological as well as
various cosmological consequences are presented. A constraint in one of the
three free parameters, namely the one related to the coupling constants at
unification, is obtained, and the possible role of scalar fields is
highlighted. A novel spectral action approach based upon zeta function
regularisation, in order to address some of the issues of the traditional
bosonic spectral action based on a cutoff function and a cutoff scale, is
discussed.
