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Posted by Mark on October 8, 2001 20:46:59 UTC

>>>Time is scalar (not a vector), right? Same as mass, work, temperature, etc.Now, replace t to -t in equations of motion, and you'll simply get motion in opposite direction. (Replace x to -x, and it is the same result. Just because v=dx/dt. Changing sign of EITHER x or t changes velocity sign.) So, from mathematical point of view motion "back in time" is the same as "back in space". Nothing unusual. Negative momentum of a photon (=attraction) instead of positive (repulsion). But is it indeed backward motion in time?

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