Does the Grandfather paradox rule out time travel?

It has been said that "............. time travel into the indefinite future is consistent with the laws of nature. It's only travel backwards in time that is the source of the debate....." Asked by Geppetto 46 months ago Similar questions: Grandfather paradox rule time travel Science > Physics.

Similar questions: Grandfather paradox rule time travel.

No, the Grandfather paradox does not rule out time travel. You are not compelled to kill your grandfather. It is not inevitable that time travel will result in a Grandfather Paradox.

There is no acceptable resolution to the paradox if time travel happens. None of your proposals works: "What about infinite timelines; "Copenhagen interpretation" of quantum mechanics; "multiple universes interpretation" of quantum mechanics; a single timeline. " A single timeline is what gives you the Grandfather paradox.

The Copenhagen Interpretation of QM applies to what happens NOW, not time travel. Bell's "quantum splitting" (what you call "multiple universes interpretation") might have some bearing. Under quantum splitting, the universe splits each and every time that there is a decision, so that EVERY decision happens.So you would have the universe split at the moment the time traveller decided to take his journey, and in one of those universes the journey wouldn't happen -- no Grandfather Paradox.

The universe would split again at the decision to actually kill the grandfather. In one universe the time traveler would not kill his grandfather and no paradox. BUT, in one universe the time traveler would kill his grandfather and you would still have the Paradox.

"That there is both a past and a future existing simultaneously at any time? " Apparently not. There are some physical processes that do have an arrow of time.

Therefore the past and future cannot exist simultaneously because those reactions could not take place if this were true. All that said, there are 2 loopholes in physics that might allow time travel: 1.Tachyons. Special Relativity allows particles that would only travel faster than light.

Such a particle -- tachyon -- would go backwards in time.2. "Time travel: just a fanstasy? The investigation of exotic spacetimes that seem to permit travel into the past will remain an active field of research.

So far, the loophole in the known laws of physics that permits time travel is very small indeed. Realistic time-travel scenarios are not known at the time of writing. But as with tachyons, in the absence of a no-go proof, the possibility has to stay on the agenda.

So long as it does, paradoxes will haunt us. '' Paul Davies, About Time, 1994.So, sci-fi authors will continue to play with the paradoxes of time travel. But there are no definitive answers for you.

Nope The Grandfather paradox doesn't hold up. It says that, if you could travel into the past and kill your grandfather, that you wouldn't then exist and couldn't go back in time. All it really means is that if you go back in time you CAN'T kill your grandfather because that would mean you wouldn't exist.

The very fact that you are there trying to kill him means that you didn't succeed. The real problem with traveling back in time is that time and space are essentially the same thing. Traveling in time also means traveling in space.

If you go back in time a hundred years and don't travel in space as well, you'll just die in the vacuum because Earth won't be there. It'll be a hundred years back along the galactic orbit and won't show up in time for you to catch your breath. Traveling a hundred years in space to get to where the Earth was a hundred years ago would violate the speed of light speed limit which, Star Trek notwithstanding, still appears to be as fast as it's possible to go.

Time travel into the future is a different matter, that's just a function of relative speeds. Head out from Earth at 99% of the speed of light for a year, turn around and come back. You'll find that time has passed a lot more quickly on Earth than it did in your spaceship so you'll be a lot more than a year into the future compared to when you left.

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No, the Grandfather paradox alone does not rule out time travel. I am assuming that we are setting aside other difficulties with time travel, and to just consider the Grandfather paradox (GP). And, as you pointed out, time travel to the future presents no issues regarding this paradox, so it's only travel BACK in time that we need to worry about.

There are several ways around the GP, including strange physics (multiple universes and such). But, to me, the most interesting and intellectually pleasing solution is to consider that, if one could travel in time back to the past, it may simply be impossible to create the paradox (e.g. , murder your grandfather). Why?

There are several possibilities. Suppose you travel back with the intention of creating the paradox via grandfather-icide. You sneak up behind the poor guy with a loaded gun.

Then, just as you try to pull the trigger ... 1) you are arrested; or 2) The gun misfires; or 3) A passerby happens to step into the path of the bullet (someone who is known to have been murdered on that date); or 4) you have an acute attack of conscience and cannot pull the trigger; or ..... 5) you faint from the stress and pass out; or 6)any other of myriad reasons. It may be that it is simply impossible to change the "present" by traveling back in time.It you could travel back, all you would be able to do is to confirm (or even create) "historical" events. I am sure there are other reasons why the GP does not rule out time travel, but this is the one I like best.

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The problem is with the question. The whole concept of "Time Travel" you better think a bit more about. To travel implies movement through, which assumes that there is a past and a future, both very shaky concepts.

Since we have no handle on "time", it's going to be mighty hard to move.. no traction.

1 Ancient_HackerI think it you look at the possible resolutions you'll understand the question. There's nothing wrong with the question.

Ancient_HackerI think it you look at the possible resolutions you'll understand the question. There's nothing wrong with the question.

" "Time travel. Where? Why?

" "Do you think time travel will be possible?" "do you believe in physics? " "Is time travel possible? " "I read a book about archaeologists and time travel back to medieval times involving quantum physics.

What is called?

I read a book about archaeologists and time travel back to medieval times involving quantum physics. What is called?

It is not inevitable that time travel will result in a Grandfather Paradox. There is no acceptable resolution to the paradox if time travel happens. None of your proposals works: "What about infinite timelines; "Copenhagen interpretation" of quantum mechanics; "multiple universes interpretation" of quantum mechanics; a single timeline."

A single timeline is what gives you the Grandfather paradox. The Copenhagen Interpretation of QM applies to what happens NOW, not time travel. Bell's "quantum splitting" (what you call "multiple universes interpretation") might have some bearing.

Under quantum splitting, the universe splits each and every time that there is a decision, so that EVERY decision happens. So you would have the universe split at the moment the time traveller decided to take his journey, and in one of those universes the journey wouldn't happen -- no Grandfather Paradox. The universe would split again at the decision to actually kill the grandfather.

In one universe the time ... more.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.