Time travel Definition and 351 Threads

Hey guys I have an issue I was wondering if you could help me with. There was a book in my high school library about the theory of relativity and time travel. I'm trying to find it again but the fact that I don't have a title for it is making things difficult. (For the record I'm long graduated...

I was thinking about time travel...this is what i came up with ----> lets say person A (age 20,year 2014) travel to the year 2024 and meets himself (A2, age 30).lets say a kills his future A (i.e A2) and travels back in time (which i know is not possible but then). Now A is back in 2014.After 10...

Of course, I know that time travel is still a science fiction, but I have heard that General Relativity allows this to happen. [reminder of post removed by moderators, as it follows from a false premise]

The Multiple universes hypothesis states that there are infinite number of universes, collectively known as the "multiverse". If a person is about to travel back in time, he will create his own parallel universe upon arrival in the past. So if he kills "his" grandfather, a paradox would not...

After reading about everything I can find on the subject while researching for a story, I've come to the conclusion that wormholes (or "jump" drives or gates) are the only potential "class" of FTL mechanisms which are even remotely (not a problem for fiction) plausible while also not opening the...

An immortal woman who is about to go back in time is mailed a book from an unknown address. Inside the book reveals explicit instructions on how not to die while in the past leading up to the present day. The book is written by her future self and mailed to herself by her future self who is now...

There is no edge of the Universe. Alright, I kinda realize this, I'm not a layman. However, nobody addresses what would happen if you traveled far enough. There's only a limited amount of matter out there and going off the theory that the volume of our Universe is finite, there's 'an edge'...

So, I've been learning about quantum mechanics as of late. If I understand correctly, there would be a large amount of energy required to "turn back the clock" on all particles throughout Earth (assume that I don't change the position of satellites or the stars) in order to go back in time...

Hi, I don't know if I am in the right sub forum or if this topic has been discussed but I'll ask anyway. so I don't think travel into the future beyond what hasn't happened yet is possible and believe it or not, it sounds more possible to me to travel into the past since the past already...

I was just thinking about how cool it could be to time travel, but I don't know if it's technically possible. The only Physics class I took was a first semester calculus based physics class so I don't know if they ever talk about time travel in other physics classes. I don't know if this is a...

http://arxiv.org/pdf/1312.7128v1.pdf

Hi, I'm looking for time travel stories (preferably movies) without paradoxes (grandfather paradox and similar). Also, I'm not looking for stories that try to explain changes in the past with the creation of alternate timelines. I'm talking about stories where people travel into the past and...

Hello! Sorry, I'm not not exactly sure if this post is in the right thread. But I would just like to ask what time travel theory is appropriate, and hopefully much easier to use, for science fiction? I am planning to write a semi sci-fi short story, and it involves using time travel: to the...

So I look at the Minowski diagrams, and I can understand that moving on the y means moving in time, and moving on the x means moving in space, but drawing some diagrams of my own, I find it impossible to see why it would imply FTL travel. All objects travel either directly on the x...

Doc Brown's explanation of time travel on the blackboard, in BTTF2, the best explanation of time travel I have seen in any movie.

I am currently in the process of re-writing an episode for a Science Fiction television series. Currently the main character a 280 year old human scientist travels back in time to stop catastrophic events set in motion. I would like to stay away from the actual time travel of a human being. So I...

Doesn't traditional time travel violate conservation laws? If I could in effect materialize in the past, then the universe, being an isolated system would have suddenly gained matter/energy out of nowhere! Also, the atoms that make up my body would then be in two places at once since they...

Hey guys, Why you think time travel will be or won't be possible either now or in the future?

This is my first post so let me know if I'm posting this in the wrong section. I read somewhere that if we are ever able to travel faster than the speed of light that fact would automatically enable us to travel back in time. I don't see how those two things are connected. Even if we travel...

Hey guyies, can i get some really interesting and crazy paradoxes, except the grandfather one, thank you

I'm not sure if this is the right area of the forums. If it's not. Tell me which area would be better and I'll post this there. Time Travel- Would have to be space travel... and possibly faster than light If the time traveled and the time it takes to travel took less time to travel...

I'm looking for as much information as possible about time travel to the past and ideas for hoe to make it a reality. Thanks in advance!

My guess is that this topic has been covered somewhere at some point. However, I have not recently seen a general, more non-technical treatment of the subject, so I thought this may be the thread for it. In any case, for discussion purposes, I'm going to make the bold statement that time...

So basically if you were on Mars, you cool look back and see yourself traveling to mars?

i don't know in which section it belongs, so i am putting it here... according to various theories proposed by various researchers, time travel depends on the speed of light. as far as i have read/heard - i) anything traveling faster than the speed of light moves back in time. ii) anything...

If someone were able to travel back in time and change an event in history which resulted in a divergent timeline from the one you came from would both timelines be part of the same space-time continuum? I suspected they could be because part of their timelines are shared and connected to...

Has Anyone ever thought of this time travel paradox before? That a couple or more (some men and some women ok) went back in time via a Time Machine and started, i.e. seeded the Human race? That is the Human Race is a Perpetual Loop? What would this be called?? A feedback loop?

I have had this question and nobody can answer it, so I decided to REGISTER here. If time travel was possible, would a person living in the year 3000, time traveled back to year 1000 AD. Does that mean that life has already been played out? Meaning people living in the year 1000, feel as...

Hi - Physics is not something I studied in school and to be fair to myself, not doing so saved me from failing the class... Over the years, my 16 y/o son and I have watched Nova and we do some light reading on Quarks, String Theory etc. My son seems to understand things that I do not and from...

Your opinion on"exceeding the speed of light means the ability to return to the past" I personally think this assertion is absurd, so I'm wondering why so many people(including physicists) think this is true.

So, I'm certainly not a physicist but I think I've just about started to grasp the concept of relativity and spacetime - maybe. A little bit. Hopefully. Anyway, I've always felt the concept of time travel is ridiculous, or at least backwards time travel, and I was trying to prove this to myself...

So imagine your on Earth at a latitude of 30 to 45° N, between two rotating Kerr Metric Blackholes with detached event horizons (dual singularities) allowing you to be shielded from the crushing force of the black holes. Which way do the rotating black holes need to rotate for the past and...

((Wasnt sure where to post this one, but i felt this spot was good)) Okay Dr. Stephen Hawking conducted a time travel experiment in an attempt to prove that time travel will be invented one day. The basic idea was to throw a party for time travellers and announce the time and location of the...

If it is true that when traveling close to the speed of light makes you go forward in time. Then do you go back in time (observed from the destination) as you travel to your destination close to the speed of light? And why don't particles traveling at near light speeds appear to warp time...

Hi 'body, ok, this is a well known issue, but i still can't find a valid explanation of why FTL implies time travel. I've read lot of explanations, and each one ends up with a nonsense telling something like "if you drive a FTL car when you'll arrive you'll see yourself opening the car door...

I just got done watching Stephen Hawking's Into the Universe episode 2, which is about time travel. They think that time travel into the past is most likely impossible simply because of paradoxes (go back in time, and kill yourself before you went back in time). However, tiny wormholes the...

Would time travel to the past be possible if...? We didn't focus on reversing time itself (which is obviously impossible), but focused on accessing a past parallel universe. And creating some sort of portal to these past parallel universes, like a "quantum" wormhole (i know it sounds like...

It is well-known that associated with the Kerr solution which represents a rotating black hole, there can be a region of space-time where there are loops in space time (non simply connected paths which are navigable in principle). If this is so, it breaks causality and permits time travel in...

Hi, I'm not sure if this is the right sub-forum because i know very little about this kind of stuff :/ But something has been bugging me for a while and it's probably very stupid but like i said, I know very little :) So, from what i understand if we can travel close to the speed of light we...

Homework Statement [PLAIN]http://vctson.com/temp/curve.jpeg Find the curve y = f(x) so that the ball travels from A to B in minimum time? Thanks!

Today, October 6th 2011 I received my first official reminder about the electoral register form I obviously didn't complete on 15 October 2011 from the Registrar. He further wrote Well after trying unsuccessfully to apply Einsteins theory of simultainity to the concept of instantaneous...

If time travel is possible does it allow for violatation of the no clone theorem? thanks

The main, or one of the main, arguments I hear about neutrinos flying faster than light is that it would violate casualty aka. time travel. The Light Cone is supposed to be broken, in that case, and impossible things happen. But, even if neutrinos do travel faster than c - all we need to do...

Hi I'm new and an idiot so please don't burn me, I wouldn't have come to a specialist forum if I could have found the answer in a more mainstream place. Anyway, can somebody please explain to me in layman's terms why, if one could travel faster than the speed of light, they'd go back in time...

Hey i am new in this forum and just want to share my thoughts with you guyz at the recent finding at CERN . If the findings of CERN experiment are correct then does it means that time travel into the past is proved WRONG.? Because according to relativity theory if something moves faster...

Why does faster than light travel or propagation mean time travel backwards to violate causality?

And how is it possible or not possible? Can you also take into consideration the new advancements in physics. thanks

Why can't we time travel in backward?? Consider a person traveling in space (Straight road) O <|> /\ _______________________________________________ 0 Km 12 Km He travels at 100 m/s and completes 12km in 2...

Hi! First of all, I just want to say that I don't know much about general relativity. But my question concerns an example often found in textbooks about special relativity. On to my question. I have heard several times that one can travel forward in time (earth-time) by leaving earth...

http://www.physorg.com/news/2011-07-hk-physicists-photons.html I thought to the future was possible, but not anymoerÉÉ