Off-diagonal Posted July 22, 2007 Share Posted July 22, 2007 I found in my text book it's only define by [math]ds^2[/math] but I want to know its physical meaning thanks Link to comment Share on other sites More sharing options...
timo Posted July 22, 2007 Share Posted July 22, 2007 Slower than lightspeed, lightspeed, faster than lightspeed. Link to comment Share on other sites More sharing options...
Off-diagonal Posted July 22, 2007 Author Share Posted July 22, 2007 Can you explain those word? What is a consequence of faster than lightspeed ? Link to comment Share on other sites More sharing options...
fredrik Posted July 22, 2007 Share Posted July 22, 2007 > What is a consequence of faster than lightspeed ? Space-like separated spacetime events, can't be connected by a signal slower or equal that of light speed, only by faster than lightspeed. And according to SR postulates, there are no such signals in nature, which means there can according to SR be no causal relation between space-like separated events. Time-like and light-like events are those than can possibly be causaly related. Of course there could still be correlations, which is not the same as causality. Of course, one might argue howto prove a causality without resting on correlations for evidence, or how to make a foolproof definition of physical causation in terms of measurements only /Fredrik Link to comment Share on other sites More sharing options...
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