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MadIce
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I tried to find the announcement, but couldn't find it. Why was forum 56 (the Time Travel Forum) removed?
Tom McCurdy said:hmm
I am goign to be offering forums for physics that aren't hosted here-- specific areas of interest. Contact me to see if you make the list
Tom McCurdy said:ty for ur response-- i think
Thank you. The reason I asked was that I have a time travel message board myself and in our portal section we had a link to the mkaku.org Time Travel forum. I now have it replaced by the PF.Tom McCurdy said:hmm
I am goign to be offering forums for physics that aren't hosted here-- specific areas of interest. Contact me to see if you make the list
A time machine based on an immense cylinder spinning at near-light speed. The physicist W. J. van Stokum realized in 1937 that such an object would effectively stir spacetime as if it were treacle, dragging it along as the cylinder turned. What van Stokum didn't realize is that circumnavigating such a cylinder can lead to closed time-like paths. Anyone orbiting the cylinder in the direction of the spin would be caught in the current and, from the perspective of a distant observer, exceed the speed of light and thus travel back in time. Circling the cylinder in the other direction with just the right trajectory would project the subject into the future. The van Stokum time machine is based on the Lense-Thiring effect and uses ordinary matter but of enormous density - many orders of magnitude greater than that of nuclear matter.
http://www.daviddarling.info/encyclopedia/V/vanStokum_cylinder.html
An infinite, spinning cylinder. This allows for time travel if one travels around the cylinder. Cosmic strings. They allow for time travel if the cosmic strings collide. A spinning black hole. This collapses into a spinning ring (not a point), so anyone falling through the ring might actually fall through a wormhole (the Einstein-Rosen Bridge) which, like Alice's Looking Glass, connects two different regions of space and time. Negative matter. If enough negative matter were to be found,then it might open up a wormhole large enough so that a trip through time wouldn't be any more jarring than a ride on an airplane. Negative energy. Similarly, an intense concentration of negative energy can also open up a wormhole. A crude version of "warp drive" can be obtained if one stretches the space in front of you and compress the space behind you via negative energy. A Theory of Everything may also help explain the sticky paradoxes found in time travel stories,such as the grandfather paradox (what happens if you kill your ancestors before you are born). Because the entire universe must be quantized, it’s possible the universe splits in half when you alter the past. The "river of time" forks into two different rivers.
selfAdjoint said:http://www.physics.uconn.edu/~mallett is Mallett's faculty site at University of Connecticut. He discusses several of his researches including the weak field calculation you mentioned Sol. Several other sites I found by googling contain speculations and one journalistic site says that he and a coworker are trying to build such a ringlaser as he described and thendemonstrate frame-dragging (and CTCs and thence time travel) experimentally in accordance with his theory.
AFAIK his theory is a serious study in GR math, was published in Physics Letters, and has not been refuted. Some other physicists are quoted as thinking the gravity of the laser light won't be enough to generate the effect. But I would think that Mallet, who calculated the effect, has so far got the last word on that.
sol2 said:Mar 30, 2004 2:48 pm (#18 of 20)
Edited Apr 13, 2004 7:52 pm
Ronald Mallets work?
I think Steve Carlip has something to say on this?
MadIce said:
juju said:HI all,
No one will ever travel to the future or the past of his own world line.
No one will ever travel to the past of another world line he has once intersected.
Only travel to the future of a once intersected world line can be contemplated.
If world lines have not intersected, future and past as relates two world lines is indeterminate.
As to the idea of splitting universe world lines. Where does the energy come from. You would be doubling the energy.
juju
Another way of time travel possibility is if time does not really exist. This would be if all possibilities of the universe exist in a sort of multi-dimensional phase space where all these possibilities are accessible from each other and the normal path through the space is just governed by momentum within the phase space. ---Juju 9/16/04.
Regardless of our differences in our definitions of time, I do agree that in actuality all events in the universe occur simultaneously. ---Juju 9/24/04.
Another way of time travel possibility is if time does not really exist. This would be if all possibilities of the universe exist in a sort of multi-dimensional phase space where all these possibilities are accessible from each other and the normal path through the space is just governed by momentum within the phase space. ---Juju 9/16/04.
The purpose of "Forum 56 Removed: Time Travel Forum" is to provide a platform for discussing theories, ideas, and advancements related to time travel.
Anyone with an interest in time travel, regardless of their background or level of expertise, can participate in "Forum 56 Removed: Time Travel Forum".
Yes, there are rules and guidelines in place to ensure respectful and productive discussions. These can usually be found in the forum's terms and conditions or community guidelines.
There may be experts or professionals in the field of time travel who participate in "Forum 56 Removed: Time Travel Forum", but this cannot be guaranteed. It is primarily a forum for open discussions among enthusiasts.
It is not recommended to post about personal experiments or inventions related to time travel on "Forum 56 Removed: Time Travel Forum". It is important to follow ethical and legal guidelines when conducting any experiments or creating inventions. However, you can share your ideas and theories about time travel on the forum.