I am a physicist and believe that time travel is possible and I am interested in books on this subject and new theories that anyone may have.
136605
Albert Einstein. \n\nTime travel is kind of like standing at the north pole you can travel but only south. Time is a perception of the mind (as is all of the universe!), as Albert said "Time is an illusion, although persistent still just an illusion!". We can only travel forward in time, we CAN distort time however as we do so our perception (which is a factor of time) is also distorted so that we cannot detect the distortion. The best reading is Einsteins theories.
261864
I haven't.But.......\n\nTime travel has been a popular science-fiction theme since H. G. Wells wrote his celebrated novel The Time Machine in 1895. But can it really be done? Is it possible to build a machine that would transport a human being into the past or future? \nFor decades, time travel lay beyond the fringe of respectable science. In recent years, however, the topic has become something of a cottage industry among theoretical physicists. The motivation has been partly recreational-time travel is fun to think about. But this research has a serious side, too. Understanding the relation between cause and effect is a key part of attempts to construct a unified theory of physics. If unrestricted time travel were possible, even in principle, the nature of such a unified theory could be drastically affected....
539547
Travelling back in time is not allowed by einstein's theory of relativity...however if you can instantly teleport youself to some faraway star,say a 101 light years away, you might be able to catch einstein receiving his nobel prize!! as stated earlier, there is no master grandfather clock that is regularly ticking away the seconds..rather that rate is adjustable...but one may zip into the future..consider an example where you are on a space-ship at a speed of 0.99990 c that is going away from the earth and coming back..in your time frame say,it takes about twenty years..using lorentz transformations, the time for your to and fro motion is close to 450 years!!
575629
Time machines are possible. The fact that you, yourself, exist is proof of this - you are a machine travelling through time at a rate of one second per second.
155737
I have always been interested in this.  I view time like a long chain being wrapped around a pole.  The more it wraps around the faster it gets.
19313
I agree with the above answer....but think about this for a second.....if time travel ever becomes possible...we would all travel back in time to clean up stuff and change what we think we need to.....and since no one has shown up to change anything recently.....it just shows that time travel will never happen....
18518
Of the three, I would say a dream viewer would be the most tangible.  Science is constantly making advances in neurology.  Time machines and teleportation devices would both defy laws of science.  Time travel itself would be a form of teleportation.  Would you want to trust a machine to reassemble your atomic/molecular structure?  I also would consider impossible for a machine to transport the human soul.
425733
Mathematically speaking time travel is theoretically possible under certain conditions.These conditions are namely, at very small distances, within black holes, wormholes or antimatter. \n\nIn fact we now know that antimatter goes background in time. Further and within Planck's length, particles go to the future to "borrow" energy or matter and then go to the present ( they do this all the time).\n\nA black hole ( event horizon) is a point with a gravitational pull so strong that not even light escapes. At event horizon, in the border of black holes time would stop and there is speculation of what could happen if you could cross the vent horizon without being destroyed in the process.\n\nWormholes use the curvature features of space and could help travel to the future. However the apertures are quite small and there is no guarantee a human could get through the wormhole complete.\n\nNow the problem of time travel is how to transport a human being through the black hole, worm hole or make him ( or her) antimatter and then matter again.\n\nSo time travel, yes it is a reality. transporting a human being through time really belongs to science fiction writers for the time being
650905
Actually, the current theory on time travel is that the furthest back into the past you can travel with a time machine is to the point that the time machine was created.\n\nAccording to this theory, to travel back into the past, you would need to create two worm holes.  One wormhole would exist at the time that you turn on the machine and the other worm hole would be put somewhere to 'age'.  At some time in the future, something could be put into the wormhole in the future and it would come out in the past.
451176
I think that it is possible. Time is used to allow for the changing state of the other dimensions. Since there are three observable spacial dimensions the idea of multiple time dimensions offers some interesting insights that may help to create a TOE (theory of everything) that is simple, elegant and  consistent with our observations. It may well be that gravity is equivalent to "negative time" since it appears to be a force that is working constantly to   cause the universe to collapse into itself and back into the base state of the universe - as it was at the time of the big bang. The force we have been calling dark energy could be viewed as a manifestation of "positive time" - since it represents the force which causes the universe to expand outward at a ever accelerating rate.\n\nThis would mess up many other theories - but it might be consistent with Einstein's relativity and I think it makes the idea that acceleration is equivalent to mass easier to understand, especially as it relates to time dilation for the frame of the observer travelling at the speed of light, relative to time as experienced in the rest of the universe at speeds below that of light.\n\nSuch an idea also suggests that the difference between certain quarks may actually be their time polarity which could make a positron a kind of time reversed electron. \n\nGiven the relationship between the two may be time polarity it might be possible to equalize  the two - perhaps by feeding enough dark energy into the counter-rotating singularity around a black hole, which then might cause it to become a sort of super-temporal space - an strange infinite singularity that could never collapse because it is already been forced 'outside' of normal time and into a special kind of zero-time space. \n\nWho knows? Perhaps that was the cause of the big bang in a universe which existed before this one and when that universe collapsed it was the destabilizing influence that caused this one to begin.
27639
No.  You'd need to have a wormhole.  Current theory predicts that transversable wormholes exist but would not allow time travel.  See reference for details.
315138
A Brief History Of Time, The Universe in a Nutshell, Black Holes, Babby Universes and Other Essays  - Stephen Hawking\n\nThe Elegant Universe   - Brian Greene
335632
In fact we indeed are traveling in time. But, only in one direction, i.e., towards the future; and that too, with a certain fixed 'speed' (call it, spending one second per second). Do you understand what I am saying? I am saying that we can not move backward towards our past, and , we have no control over the passage of time.\n\nThe special theory of relativity, however suggests a theoretical method to control the passage of time: Time dilation, which requires moving with speeds around the speed of light. The theory holds that, relative to a stationary observer, time appears to pass more slowly for faster-moving bodies: for example, a moving clock will appear to run slow; as a clock approaches the speed of light its hands will appear to nearly stop moving. However, this effect allows "time travel" only toward the future: never backward. \n\nMany in the scientific community believe that time travel is highly unlikely. This belief is largely due to Occam's Razor. Any theory which would allow time travel would require that issues of causality be resolved. What happens if you try to go back in time and kill your grandfather. Also, in the absence of any experimental evidence that time travel exists, it is theoretically simpler to assume that it does not happen. Indeed, Stephen Hawking once suggested that the absence of tourists from the future constitutes a strong argument against the existence of time travel - a variant of the Fermi paradox, with time travelers instead of alien visitors. However, assuming that time travel cannot happen is also interesting to physicists because it opens up the question of why and what physical laws exist to prevent time travel from occurring. \n\nFrom the above note, one can note two points:\n1. Time-travel is highly unlikely, and,\n2. Possibly, it is uni-directional (towards the future, not back to past).\n\nSo, it seems that knowing the future by visiting it is either not possible, or, once you are in your future, you can't come back to present to tell your friends that you know the future!!!\n\nPartly, knowing the future theoretically, is perhaps possible if you understand and meticulously use the principle of causality.
219006
Wow..!! sounds like a nice concept..we can take a movie out of it !! Good Story line..\n\nBut how do we interact with the Non-Existent People ?  Shoud we keep our Mind open for that ??  Because I have often heard some saying.. those who believe in Ghosts can only see them.. - If that is the solution..  To go to a past.. do we have to just keep searching for open Minds ? or Can the Time Travel Concept be corolated with the Open-Mind Concept ..   \n\n- I wanted to get some best answers.. and finally ended up in having so many questions :)
230657
There is no such thing as time travel, it's a physical impossibility. The reason we haven't had any visitors from the future is because time travel simply cannot occur.
411272
various government agencies try playing around with fringe science all the time. they tried time travel, psychic intelligence gathering, astral projection, invisibility, antigravity, lasers, etc. they didnt get very far with a lot of it because its not plausible. some things you should look for that are more reasonable are "flying triangles" and "rods from God"
218029
I doubt it, I think it's just one problem that someone put forward to explain why Time Travel would be impossible, some of the first examples given were the Grandfather Paradox and the Butterfly effect but loads of Oxymoron's exist such as "American Military Intelligence!"  but what's the point of being an oxygen breather if you can't be a moron :0)