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Principle of Equivalence makes effects of classical gravity vanish in localinertial frames. What role does the Principle of Equivalence play as regardsquantum gravitational effects in the local inertial frames? I address thisquestion here from a specific perspective. At mesoscopic scales close to, butsomewhat larger than, Planck length one could describe quantum spacetime andmatter in terms of an effective geometry. The key feature of such an effectivequantum geometry is the existence of a zero-point-length. When we proceed fromquantum geometry to quantum matter, the zero-point-length will introducecorrections in the propagator for matter fields in a specific manner. On theother hand, one cannot ignore the self-gravity of matter fields at themesoscopic scales and this will also modify the form of the propagator.Consistency demands that, these two modifications - coming from two differentdirections - are the same. I show that this non-trivial demand is actuallysatisfied. Surprisingly, the Principle of Equivalence, operating at sub-Planckscales, ensures this consistency in a subtle manner.

Principle of Equivalence at Planck scales, QG in locally inertial frames and the zero-point-length of spacetime