:: : : The speed of light doesn't limit density because the wave speed equations that depend on density break down if the speed of the individual material particles becomes relativistic . ( They probably break down well before then, actually; most such equations apply only in the limit of small ( read : slow ) oscillations . ) In other words, a material wave travelling faster than light would require some propogating influence ( e . g ., electrostatic repulsion in most compression waves; particle collisions in gases ) or material particle to be travelling faster than light, and that's already impossible without talking about density .-- Tardis 03 : 10, 25 July 2006 ( UTC)
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