| Re: null cone -
08-11-2006, 04:10 PM
Within each null cone is a vertex representing an event (the now) separating the past and the future. The motion of this vertex in spacetime is a worldline. If a worldline closed in on itself, then it is the same as a light cone where time stops.
Time independence: [∂E(g)]²=[∂F(a)×∂r(a)]·[∂F(b)×∂r(b)] and Mass independence: ¶a(t)·¶r(t)=c²
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