  We propose an operatorially-exact formalism for describing the equilibrium
and quantum-dynamical properties of many-electron systems interacting locally
on a lattice, called "ghost rotationally-invariant slave-Boson theory"
(g-RISB). We demonstrate that our theoretical framework reduces to the
recently-developed ghost Gutzwiller approximation (g-GA) at the mean-field
level. Furthermore, we introduce the time-dependent mean-field g-RISB action,
generalizing the time-dependent GA theory. Since the g-RISB is based on exact
reformulation of the many-body problem, it may pave the way to the development
of practical implementations for adding systematically quantum-fluctuation
corrections towards the exact solution, in arbitrary dimension.
