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The different roles and natures of spacetime appearing in a quantum fieldtheory and in classical physics are analyzed implying that a quantum theory ofgravitation is not necessarily a quantum theory of curved spacetime. Developingan alternative approach to quantum gravity starts with the postulate thatinertial and gravitational energy-momentum need not be the same for virtualquantum states. Separating their roles naturally leads to the quantum gaugefield theory of volume-preserving diffeomorphisms of an inner four-dimensionalspace. The classical limit of this theory coupled to a quantized scalar fieldis derived for an on-shell particle where inertial and gravitationalenergy-momentum coincide. In that process the symmetry under volume-preservingdiffeomorphisms disappears and a new symmetry group emerges: the group ofcoordinate transformations of four-dimensional spacetime and with it GeneralRelativity coupled to a classical relativistic point particle.

General Relativity as the Classical Limit of the Renormalizable Gauge Theory of Volume Preserving Diffeomorphisms