  Standard approaches to quantum gravity start with a pre-spacetime structure
and attempt, in accordance with Bohr's correspondence principle, to recover the
pseudo-Riemannian manifold in the low energy limit. These approaches assume
there is a smooth transition from quantum gravity to general relativity common
to successful quantum theories. However, as gravitational field, and hence
spacetime, cannot be considered in isolation from physical fields,
discontinuities in properties of physical fields, such as loss of mass at the
electroweak symmetry breaking scale, may result in change of spacetime
structure somewhere between the Planck scale and the scale where general
relativity holds true. As a result, the correct theory of quantum gravity may
not have general relativity as its low energy limit.
