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ZiNgA BuRgA · 19/10/2009 11:37 PM

Yay, everyone's favourite topic!

Okay, so you may have seen a number of methods in fiction shows used to represent how it would work, eg you get duplicated when you time travel.  Let's take this duplication principle - would it allow you to make arbitrary number of copies of yourself?  Perhaps get each copy to go to different time periods so that you exist throughout time (and thus, live forever / be invincible)!

Anyway, ignoring that, here's a problem.  If you time travel into the future, then back into the past, and get killed in this past.  Assume the future you knows of your death in the past.
If that's the case, when in the future, you would not travel back into the past since you know you'll die.  But if you never make the trip, the event never occurs, and thus you'd make it (for one reason or another)...

(this is subtly different from the well known "go back and kill grandmother" issue)

Vegetano1 · 20/10/2009 12:04 AM

1 idee:
all coppies won't experience the same things,. so they do not really live forevar<>?
2 idee:
the future dude can't know he is going to die in the past,. since he have't travelt back to the past yet<>? dunno how to assume he can assume this<>?

something else>
If you time travel will time itself effect you<>?
eg if i would go back to my 5th birthday would i turn 5 again,. ;p

i like to go slightly offtopic,. i have been looking for this time travel movie for weeks now,.. its about a bunch of scientists who made a portal when they go through they can only walk over a certain bridge they made to prevent taking anything back to the future,. they go back to prehistoric period and things go wrong and eveytime they go back a time wave changes the world,.. anyway i searched everywhere,. but i can' find the title name,. :(

trademark91 · 20/10/2009 12:09 AM

these are all valid questions. but i think they involve dividing by a zero...

on a more serious note.
i think you create temporary duplicates of yourself, meaning that you cannot be actually the same person at the same time.
and i also think that if you die in the past, you stop existing in the present.

krystabegnalie · 20/10/2009 12:15 AM

i think base with Alexander Dumar's Time Travel novel book, you can't change your past even you want to change how it used to be, but you can change your future, and it will cause paralax universe when you tried to change it

and yeah Trademark has his point.

Kana · 20/10/2009 12:16 AM

it will cause an infinitive loop on theory. but who knows. you might even go doraemon style.

trademark91 · 20/10/2009 12:29 AM

also, it is interesting to note that time travel could never accomplish its intended purpose, it that is changing the past. because say if you invented a time machine to save your girlfriend from a car crash.
this would mean that if you built a time machine, and saved her, then there would be no reason for the past you to create the time machine in the first place.
so therefore you couldnt save her.
so therefore you would need a time machine.
and on and on and on.

Mickey · 20/10/2009 12:43 AM

trademark91 Wrote:also, it is interesting to note that time travel could never accomplish its intended purpose, it that is changing the past. because say if you invented a time machine to save your girlfriend from a car crash.
this would mean that if you built a time machine, and saved her, then there would be no reason for the past you to create the time machine in the first place.
so therefore you couldnt save her.
so therefore you would need a time machine.
and on and on and on.

What if you built a time machine just to have it handy?

lembas · 20/10/2009 12:46 AM

trademark91 Wrote:also, it is interesting to note that time travel could never accomplish its intended purpose, it that is changing the past. because say if you invented a time machine to save your girlfriend from a car crash.
this would mean that if you built a time machine, and saved her, then there would be no reason for the past you to create the time machine in the first place.
so therefore you couldnt save her.
so therefore you would need a time machine.
and on and on and on.

which brings us to the endless debate of predetermined life, vs. choice.

Mickey · 20/10/2009 12:50 AM

Anyone here read The Last Universe? Interesting fiction book I read awhile back, while it's not about time traveling, they travel through parallel universes which has sorta the same effect.

By the way why is the whole thing so stretched out?

ProperBritish · 20/10/2009 12:54 AM

it is impossible to travel forward in time sadly, as there is no way that the connection between velocity and time can result in time being greater than 1s s^-1. This is because the the connection is irrespective of direction of travel. It is said in relativity that if you reach the speed of light, time = 0s s^-1. And so far it has not been proven possible to exceed (or get anywhere near) the speed of light, due to the massive amount of energy required to reach 3x10⁸m s^-1, or 300Mm s^-1 (yes, Megameters). Theoretically if anyone ever does exceed the speed of light, time would start to flow backward, but wee wouldn't know about it because of how far away they'd've travelled from earth.

my 2 cents on time travel

also its stretched because of V1's art text

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