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[Earthquake Damage]

The traveller going back in time destroys Wyld stallions, wrecks their music career and ends up creating a post apocalyptic future in which Rufus is never born causing Bill and ted to fail history. That's what band we're talking about right?

The thread is won.  Nothing else to see here.

[Criptfeind]

I don't see why people have a problem with these things.

Cause that is only your opinion on what would happen.

[TherosPherae]

I don't see why people have a problem with these things.

Cause that is only your opinion on what would happen.

And we can't really say anything but that towards any theories that would come up unless someone manages to invent a time machine.

Hell, I could say that if you tried going back to your home timeline after messing around in the past, pink elephants would show up in police uniforms and take you to interdimensional prison for unlicensed timestream disturbance.

[Criptfeind]

And you would be just as valid as Armok. (More so, cause I like you better)

[Vactor]

In a situation such as that I would see the following happen:

When the timeline is altered by the trip back it shifts the rest of the timeline to a different future where the man didn't end up going back in time, or did so under different circumstances.

Because of this the events that he is performing do not occur within it in the manner he is performing them, when he returns to his present, he finds that the activities he engaged in did not occur in the past, and his world is the same as it was when he left.

[Earthquake Damage]

Wouldn't changing the past be roughly the same as a massive rearrangement of the present?  So any substantial change would require vast amounts of energy, which means inefficiency alone would render time travel infeasible.

[Hubris Incalculable]

Okay, assuming that time travel in reverse is possible, and that time travel works under the "plastic time" theory, consider this scenario:

A man, who is a big fan of the band, X, uses a time machine to go back to within a year before X formed. He then records all of their biggest hits, publishes them, as X's work, copyright X, etc., and returns to his own time. What do you think has changed?

I assume you watched Hot tub time machine

No, what is it? The idea hit me while i was watching U2 perform "Where the Streets have no Name" on youtube.

[qwertyuiopas]

Well, considering that the event of your atoms suddenly appearing in your relative past alters the universe, your old future probably wouldn't exist, though an indistinguishably similar one might. Considering that your appearance is a single event, and that it alone will change the future, then nothing will happen to you if you prevent your own birth, since you already became a part of what used to be your past.

As long as someone uses time travel to visit the past, the universe would iterate through countless variations, until it created a stable time loop, at which point it would continue until the next time traveller, again iterate, repeat.

At some point, time travel becomes completely impossible, and then the universe would proceed purely linearly.


However, if one time traveler interrupts what had already settled into a stable time loop, the result would likely recursively iterate until it reaches a state where both time loops are stable.


This is all based on the viewpoint of the universe as a purely linear series of events, and reverse time travel would be viewed as copying the exact state of  a past moment on the hypothetical timeline, inserting the time traveler, appending it to the end of the timeline, and continuing from there, unless the state resulting from the insertion of the time traveler has already occurred, with absolutely everything matching perfectly, right down to the quantum level, and perhaps beyond.

[Criptfeind]

I do not think the universe needs to be nearly that exact. After all, the time streams are not going to care if I ate a taco or a hamburger before I go back and start my Dino farm.

[GlyphGryph]

Time events aren't actually causal, they just look that way.

Just like if you draw a red pen line, then "go back in time" and change some of it to black, when you return to the present nothing has changed.

Time travel thus isn't impossible, just futile.

[Akura]

I doubt time-space physics work like that.
And it wouldn't exactly turn the line black, you'd just put the black over red, which would probably be a really dark red.

[lemon10]

Time events aren't actually causal, they just look that way.

Just like if you draw a red pen line, then "go back in time" and change some of it to black, when you return to the present nothing has changed.

Time travel thus isn't impossible, just futile.

That's not really how it would work either. If you time travel back in time to a hour ago, then ran outside and shot someone, that would have a significant effect on the present (due to the dude being dead when he wasn't before).

I do not think the universe needs to be nearly that exact. After all, the time streams are not going to care if I ate a taco or a hamburger before I go back and start my Dino farm.

You would be wrong on that. Your feces would contain bacteria from 650 million years in the future, and depending on if it was taco or hamburger poo, it might contain different world changing bacteria, significantly altering the fate of the world in the present.

[Criptfeind]

Huh. Or, that could have happened, and reality has already taken me going back into account.

Also, if I was you, I would be more worried about my kidnapping of Dinos from the past, that seems like a bigger change then some poo. (Although, once again reality might have already taken me going back into account.)