  Notoriously, the two main problems of the standard $\Lambda$CDM model of
cosmology are the cosmological constant $\Lambda$ and the cold dark matter,
CDM. This essay shows that both the $\Lambda$ and the CDM arise as integration
constants in a careful derivation of Einstein's equations from first principles
in a Lorentz gauge theory. The dark sector of the universe might only reflect
the geometry of a spontaneous symmetry breaking that is necessary for the
existence of a spacetime and an observer therein.
