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OMG, I just made a remark about test particles in a semiclassical theory of quantum gravity in slight reowrking of a preprint!
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Over reacting... I just wrote a very speculative and loose comment. Basically we would expect the semiclassical limit of a 'quantum space-time' to be a smooth manifold with both a metric and a Poisson structure. I just wrote a passing comment on how to use these two together. This is already know to a few 'stringy' theorists, but maybe not widely
known.