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I'm not really sure about that. Spontaneous particle appearance in the path of motion should seem to provide a pressure against that motion through a vacuum. But there should also be particle appearance behind the direction of motion (and above and below for that matter) so shouldn't this result in zero overall pressure in any direction so that motion is not affected.
I wonder about light travelling from distant galaxies and whether the diminution of the light received is purely the result of the inverse square law which seems to be the effect of dispersion over a widening sphere or whether there are any measurable effects that could possibly be explained by spontaneous particle interactions that block out some of the photons.
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