  A theory of the initial state of the universe is proposed within the
framework of the Euclidean quantum theory of gravity. The theory is based on a
quantum representation in which the action functional is implemented as an
operator on the space of wave functionals depending on the 4D space metric and
matter fields. The initial construction object is the eigenvalue of the action
operator in the area of the Origin of the universe with the given values of the
3D metric and matter fields on the boundary. The wave function of the initial
state is plotted as an exponential of this eigenvalue, after a Wick rotation in
the complex plane of the radial variable of the Euclidean 4D space. An estimate
of the initial radius of the universe is proposed.
