$\Lambda$CDM as a Noether Symmetry in Cosmology
  The standard $\Lambda$CDM model of cosmology is formulated as a simple
modified gravity coupled to a single scalar field ("darkon") possessing a
non-trivial hidden nonlinear Noether symmetry. The main ingredient in the
construction is the use of the formalism of non-Riemannian spacetime
volume-elements. The associated Noether conserved current produces
stress-energy tensor consisting of two additive parts -- dynamically generated
dark energy and dark matter components non-interacting among themselves.
Noether symmetry breaking via an additional scalar "darkon" potential
introduces naturally an interaction between dark energy and dark matter. The
correspondence between the $\Lambda$CDM model and the present "darkon" Noether
symmetry is exhibited up to linear order w.r.t. gravity-matter perturbations.
