represents one of (or a linear combination of) the coefficients
. The quantum-gravity intuition for
is
. For example, in my simple-minded “spacetime-lattice picture”
is obtained when the lattice spacing is
exactly
. Sensitivity to values of
even smaller than 1 would reflect the ability to probe spacetime structure down to
distance scales even smaller than the Planck length (in the “spacetime-lattice picture” this would correspond to a lattice
spacing of
).