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We have emphasized that there is a big conflict between quantum theory and general relativity, since it leads to ultraviolet difficulties. However, it does not mean that both frameworks are fundamentally contradictory to each other. In fact, at large distances, the situation is quite contrary. For an example, an old story in the famous debates between Einstein and Bohr shows that the quantum mechanical uncertainty relation ∆E ∆t ≥ h is consistent with the equivalence principle when ... applied to the measurement of weights in weak gravitational fields. Their mutual contradiction is manifested only at sufficiently short distances near the Planck length, where the quantum gravitational effects become of the same order as other nongravitational effects. (en) |
