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Topic: Time travel

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  Time - Time Travel
Time travel is the concept of traveling forward and backward to different points in time, much as we do through space.
The assumption that time travel or superluminal communications is impossible allows one to derive interesting results such as the no cloning theorem, and how the rules of quantum mechanics work to preserve causality is an active area of research.
Time, and the apparent movement of time, is connected to the number 12 - which is 1+2 =3 - or third dimension.
www.crystalinks.com /timetravel.html   (2954 words)

  Time travel - Wikipedia, the free encyclopedia
Time travel is the concept of moving backward or forward to different points in time, in a manner analogous to moving through space.
On the other hand, the direction of time (or the arrow of time) may not be a fundamental intrinsic property of time, but rather could be viewed as an emergent property traceable to the fact that we live in a universe in which the entropy increases with time.
Time travel themes in science fiction and the media can generally be grouped into two main types and a third, less common type (based on effect—methods are extremely varied and numerous), each of which is further subdivided.
en.wikipedia.org /wiki/Time_travel   (4328 words)

 Time Travel - Fact or Fiction?
We define time travel to mean departure from a certain place and time followed (from the traveller's point of view) by arrival at the same place at an earlier (from the sedentary observer's point of view) time.
Time travel paradoxes arise from the fact that departure occurs after arrival according to one observer and before arrival according to another.
The B-movie image of the intrepid chrononaut climbing into his time machine and watching the clock outside spin backwards while those outside the time machine watch the him revert to callow youth is, according to current theory, impossible.
math.ucr.edu /home/baez/physics/Relativity/GR/time_travel.html   (1218 words)

 The Time Travel Page of James M. Deem
Traveling back in time is similar, except that instead of seeing a person's ghost you are seeing the ghost of a past event or place.
Although time travel is usually pictured as a great adventure and although it can be enjoyable to imagine, it is not always fun in reality.
Wells imagined future time travel in his time machine to be similar to riding a "switchback" or roller coaster.
www.jamesmdeem.com /timepage.htm   (2542 words)

 Time travel for beginners
The classic example is the so- called "granny paradox", where a time traveller inadvertantly causes the death of his granny when she was a small girl, so that the traveller's mother, and therefore the traveller himself, were never born.
Gravitational radiation itself, travelling ahead of the spaceship and into the fl hole at the speed of light, could be amplified to infinite energy as it approaches the singularity inside the fl hole, warping spacetime around itself and shutting the door on the advancing spaceship.
For example, a time traveller could go back in time and accidentally (or even deliberately) cause the death of her granny, so that neither the time traveller's mother nor herself was ever born.
www.lifesci.sussex.ac.uk /home/John_Gribbin/Time_Travel.html   (8295 words)

 Time Travel   (Site not responding. Last check: 2007-10-26)
This phenomenon is due to the principal of time dilation, which states that bodies moving at high velocities experience a time that ticks slower than the time measured at zero velocity.3 Not as much time elapses for a moving body as does for everything else.
Now that we know that it is possible to travel into the future by moving at great speeds, the next problem is how to travel in time a respectable amount without having to sit in a fast moving spaceship for years.
The limitation on this time travel into the past is that it would be impossible to travel back to a time before the machine was originally created.
www.iit.edu /~bosabri/time.html   (2322 words)

 Time Travel and Paradox
Suppose a person travels to a time before she was born and breaks a causal chain that led to the traveler's birth.
Either we are sending an object to a time and place where it already was and it is the same object in every respect as that object in that time and place or we are sending it to a place that it wasn't or at least wasn't in that exact state.
So the conclusion is that time travel of the sort, where the object is sent to a place that is identical to where it was, is not of the sort that science could claim credit for.
homepage.mac.com /billtomlinson/newtt.html   (4621 words)

 NOVA Online | Time Travel | Sagan on Time Travel
The reason this is connected with time travel is because another consequence of special relativity is that time, as measured by the speeding space traveler, slows down compared to time as measured by a friend left home on Earth.
It's only travel backwards in time that is the source of the debate and the tingling sensations that physicists and science-fiction readers delight in.
As a youngster who was fascinated by the possibility of time travel in the science-fiction novels of H.G. Wells, Robert Heinlein, and others, to be in any way involved in the possible actualization of time travel—well, it just brings goose bumps.
www.pbs.org /wgbh/nova/time/sagan.html   (1916 words)

 Wired 11.08: The Super Power IssueA User's Guide to Time Travel
By moving at high velocity, for instance, you can make time slow down, and when you come to a stop, you'll be younger than if you'd remained at rest.
While moving faster than the speed of light could, according to Einstein's equations, reverse time's arrow, such motion was impossible, because any object that reached that velocity would become infinite in mass.
Time will nearly freeze for that set while the other, still on the ground, ages at the usual rate.
www.wired.com /wired/archive/11.08/pwr_timetravel.html   (1071 words)

 BBC NEWS | Science/Nature | New model 'permits time travel'
Researchers speculate that time travel can occur within a kind of feedback loop where backwards movement is possible, but only in a way that is "complementary" to the present.
So either time travel is not possible, or something is actually acting to prevent any backward movement from changing the present.
In other words, even if you take a trip back in time with the specific intention of killing your father, so long as you know he is happily sitting in his chair when you leave him in the present, you can be sure that something will prevent you from murdering him in the past.
news.bbc.co.uk /2/hi/science/nature/4097258.stm   (703 words)

 The Time Travel Fund[tm]
A: Current scientific theory states that Time Travel may be possible, however the technology is a long way off, perhaps hundreds of years in the future.
Time machines might only be available in the movies, yet many people have experienced unexplained events that seem to be temporary but very real slips into the past and the future.
The Time Travel Institute is dedicated to the research and exploration of the temporal sciences.
www.timetravelfund.com   (2289 words)

 Time Travel and Modern Physics (Stanford Encyclopedia of Philosophy)
It is ironic that time travel should lead generically not to contradictions or to constraints (in the normal region) but to underdetermination of what happens in the time travel region by what happens everywhere else (an underdetermination tied neither to a probabilistic dynamics or to a free edge to space-time).
In the time travel case there is no such causal story to be told: there simply has to be some pre-established harmony between the global space-time structure and the matter distribution on some space-like surfaces.
Thus the reason why the global time travel properties of the counterfactual space-time have to be significantly different from the actual space-time is not that there are problems with metric singularities or alterations in the metric that force significant global changes when we go to the counterfactual matter distribution.
plato.stanford.edu /entries/time-travel-phys   (12656 words)

 Time Travel Paradoxes
First, we might think that entropy could be reversed by time travel, so that forms of matter would be restored to that state they would have been at the earlier period.
Every instance of time travel generating an infinite number of alternative universes might be thought to violate Ockham's Razor, especially since the idea that an alternative universe could be generated in the first place has disturbing consequences for the metaphysics of identity.
But without them, time travel, that would allow for the sort of temporal loop in which the paradoxical and impossible watch of Somewhere in Time becomes possible, is itself impossible.
www.friesian.com /paradox.htm   (1328 words)

 BBC - Science & Nature - Space - Time Travel
Supposedly it was Dr Who's Timelords who first harnessed the power of a fl hole to begin their experiments in time travel.
Another option for future time travellers would be somehow to harness these tiny wormholes and expand them.
If we travel back in time and change history, we launch ourselves into a new future in a parallel universe - but we have no effect on the present one from which we started out.
www.bbc.co.uk /science/space/exploration/timetravel/index.shtml   (1025 words)

 Temporal Anomalies in Popular Time Travel Movies
Flight of the Navigator may be a Disney film, but it's also a well-told time travel movie which looks at the other side of the timeline, the world that exists before the time traveler changes it.
Time travel is often used to bring lovers together, and in Kate and Leopold the century is crossed so a modern advertising executive can become a duchess.
I've concluded that it is not a time travel movie--but I've analyzed it anyway, showing why it doesn't work under any theory of time, and providing a theory of psychic prediction which, with a few reconstructions, makes it all come out as it appears on the screen.
www.mjyoung.net /time   (1265 words)

 The Time Traveler Convention - May 7, 2005
Time travelers from all eras could meet at a specific place at a specific time, and they could make as many repeat visits as they wanted.
A note: Time travel is a hard problem, and it may not be invented until long after MIT has faded into oblivion.
If the time travelers don't leave us their secrets, we won't be able to go back in time and see our convention in all its glory unless it is publicized in advance.
web.mit.edu /adorai/timetraveler   (1452 words)

 Future Horizons inc: Time Travel
When out of your body it is possible to travel in time and space with your astral body and witness or experience events in time.
A grid point is necessary for physical time travel to occur.
Shrouded in secrecy and centuries ahead of its time in its speculations, Kabbalah became subject to false rumors and suspicions: Imagine yourself trying to explain the concept of a telephone or the internet to people of the 15th or 16th centuries.
www.futurehorizons.net /time.htm   (839 words)

 Amazon.com: Time Travel (Science Fiction Writing Series): Books: Paul J. Nahin   (Site not responding. Last check: 2007-10-26)
Possible and probable time shifting machines are discussed and related to the effect they might have on the real world as well as discussing how to properly treat them in a fictional world.
Although Dr. Nahin may be a seasoned explorer of ideas involving time travel, his failure to used organized paragraphs and effective examples greatly lowered the value of this how-to book.
After you read this book, when someone tells you, "Time travel is not real," you will object strongly and start explaining to them all of the REAL laws of time travel and the REAL concept of time travel.
www.amazon.com /exec/obidos/tg/detail/-/0898797489?v=glance   (1903 words)

 Howstuffworks "How Time Travel Will Work"
There may be no other concept that captures the imagination more than the idea of time travel -- the ability to travel to any point in the past or future.
Ideas of time travel have existed for centuries, but when Albert Einstein released his theory of special relativity, he laid the foundation for the theoretical possibility of time travel.
Travel back in time with one of these award-winning films by documentarian Ken Burns.
science.howstuffworks.com /time-travel.htm   (262 words)

 Alternate View Column AV-45
The territory of time travel has, from the days of H. Wells to the mid-1980's, been the exclusive province of writers of science fiction and fantasy.
SF critics have even argued that time travel stories are so scientifically unlikely that they should be considered fantasy, not science fiction.
We could freeze the internal system with no time change for the period it was isolated, while time in the external world moved forward at the usual rate.
www.npl.washington.edu /AV/altvw45.html   (1946 words)

 Time Travel
First, relativity allows for time travel into the future: as I mentioned in a previous missive, journey at a very high acceleration and you'll return to earth years into the future, aging only slightly.
The idea that time travel paradoxes can be resolved by multiple universes isn't new, but it is reassuring to see that there's some theoretical basis for making such assumptions.
So the authors say that there's nothing to prevent time travel, as long as the multiverse interpretation of quantum mechanics is true---and in quantum theory of computation and quantum cosmology, no viable alternative exists.
www.ram.org /ramblings/science/time_travel.html   (1547 words)

 Time Travel Portal :: View topic - Time, Time Travel & Traversable Wormholes
Time travel: Is it the future or is it fantasy?
The conceptualization of time and the constancy of the speed of light
The arrow of time in quantum mechanics and in nonlinear optics
timetravelportal.com /viewtopic.php?t=293   (1516 words)

 NOVA Online | Time Travel
In the program, leading physicists delve into the mystery of whether time travel is possible, and if so, how one might go about building a time machine.
Albert Einstein showed that space is curved, time is relative, and time travel is theoretically possible.
What you would call a time machine physicists term a "closed timelike curve." Steep yourself on the concepts and conjectures, the dialects and definitions that physicists rely on when musing about the possibility of time travel.
www.pbs.org /wgbh/nova/time   (211 words)

 TimeTravel   (Site not responding. Last check: 2007-10-26)
Sherrill Roberts discusses the scientific premises that suggest that time travel may be possible, including proposed mechanisms for warping time.
Marc Davenport's latest book is his take on ufonauts as time travellers: we have met the ETs and they are us.
A short list of additional time travel books with a popular scientific approach for those with further interest in the subject.
www.strangemag.com /timetravel.html   (249 words)

 Time Travel Research   (Site not responding. Last check: 2007-10-26)
I have been fascinated by time and time travel for as far back as I can remember.
I used to watch "The Time Tunnel" and "Dr. Who", and dream of actually being able to travel in time.
I have attempted to gather together sources from the net, and elsewhere, along with info on my own time machine, which I have been designing for the last 4 1/2 years or so, for people to peruse.
members.tripod.com /~jtooker/index-2.html   (566 words)

 The World Clock - Time Zones
UTC is Coordinated Universal Time, GMT is Greenwich Mean Time.
Time Zone Converter - If it's 3 pm in New York, what time is it in Sydney?
Fixed Time Calculator - If it's 3 pm in New York, what time is it in the rest of the world?
www.timeanddate.com /worldclock   (151 words)

 Time Travel Institute
Through the contribution of hundreds of experts in the field around the world, we are getting ever closer to our goal of controlling and manipulating time.
Chief of Research at the Time Travel Institute (and fictional character) Dr. Gunthar VonSchnelling presents to you some basic theories and concepts on time travel.
Time Travel has always been a popular topic for science fiction.
www.timetravelinstitute.com   (231 words)

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