- #36
scifiwriter
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maverick_starstrider said:Just want to throw out some basic special relativity here: Tachyons WOULD NOT allow for travel (or perception) back in time. Draw a space-time diagram with a light-cone (light is a 45 degree angle). Draw an event A at your origin, draw an event B anywhere later along the time axis, draw a light-cone for B. Now Tachyons, by definitions, have speeds anywhere from faster than the speed of light (c) to infinitely fast. On your diagram this corresponds to a line which makes an angle with the x-axis anywhere from less than 45 degrees to 0 degrees. From this, please, tell me how you connect event B to A. You can't. Tachyons would violate causality (since they could "beat" the electromagnetic force in a "race") but they certainly wouldn't allow motion backwards in time, they'd also have a velocity with an imaginary component which is pretty WTF.
Oh Maverick thanks now this is truly helpful and I see what you are saying.In order to be able to make this make any sense scientifically within this model no one could go backwards in time to a point in which we are because it would be there past and there is no past for them.
Did I get it right this time?
Ouch Big problem!