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A comment on DIA Study: Warp Drive, Dark Energy, and Manipulation of Extra Dimensions (2010). Parent comment

Re:DIA Study: Warp Drive, Dark Energy, and Manipulation of E... by piyh on Monday July 09, 2018 @04:12PM (#17493071)
The speed of light is actually the speed of causality. It just happens that since photons don't have rest mass, they always move at the speed of causality.

Gluons are also massless like light, but don't exist on their own. If there's a particle that carries gravity, it would also be massless. You could say light travels at the speed of gravity.

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Re:DIA Study: Warp Drive, Dark Energy, and Manipulation of E... by tomp on Monday July 09, 2018 @04:41PM (#17493260)
This only implies that FTL transport would make causality travel a bit faster... but not subvert it (i.e. "travel through time" or "change the past").
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