Doughnut-Shaped Time Machine
A new class of time machines that are toroidal, or doughnut-shaped, has been proposed. This model for time travel does not require exotic or improbable forms of matter; it consists of a toroidal vacuum embedded in a sphere of normal matter.
(In case you can't visualize a doughnut)
In his submission to Physical Review Letters, Amos Ori, physicist at the Israel Institute of Technology, provides this abstract:
We present a class of curved-spacetime vacuum solutions which develop closed timelike curves at some particular moment. We then use these vacuum solutions to construct a time-machine model. The causality violation occurs inside an empty torus, which constitutes the time-machine core. The matter field surrounding this empty torus satisfies the weak, dominant, and strong energy conditions. The model is regular, asymptotically flat, and topologically trivial. Stability remains the main open question.
According to Ori, the mathematics show that every period of time after the time machine was created would be somewhere in the vacuum inside the doughnut. The hard part is figuring out how to get there.
It should be possible to travel back to any point in time after the time machine was built. Exactly how to generate a gravitational doughnut is not covered in the paper, but Ori has suggestions. "It's wild speculation, but you may need to move large masses rapidly in a circular motion," Ori says.
Other physicists are interested in Ori's submission. "The paper is a welcome addition to the subject, and it does look like an improvement on the previous models," says Paul Davies, a theoretical physicist at Macquarie University in Sydney, Australia, and author of How to Build a Time Machine.
Science fiction fans all remember H.G. Well's classic 1895 novel The Time Machine, about an exotic device described here by the Time Traveller:
`This little affair,' said the Time Traveller, resting his elbows upon the table and pressing his hands together above the apparatus, `is only a model. It is my plan for a machine to travel through time. You will notice that it looks singularly askew, and that there is an odd twinkling appearance about this bar, as though it was in some way unreal...'
(Read more about H.G. Well's time machine)
Read more at A new class of time machine,
Physical Review Letters and
Gravity doughnut promises time machine. Thanks to an alert reader for writing in with this item.
Scroll down for more stories in the same category. (Story submitted 7/28/2005)
Follow this kind of news @Technovelgy.
| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |
you like to contribute a story tip?
Get the URL of the story, and the related sf author, and add
Comment/Join discussion ( 4 )
Related News Stories -
NASA's LADEE Enters Lunar Orbit
'... dust normally on the surface picks up and keeps a charge.' - Hal Clement, 1956.
Nuclear Interceptors Designed For Planetary Protection
See NASA's concept for a nuclear interceptor.
SpaceX Grasshopper Divert Video
Isn't this the way that rocket ships were meant to land?
Ultrasonic Noise Betrays ISS Leaks
Gentlemen, Be Seated!
Technovelgy (that's tech-novel-gee!)
is devoted to the creative science inventions and ideas of sf authors. Look for
the Invention Category that interests
you, the Glossary, the Invention
Timeline, or see what's New.
Army's New Bird-Like Surveillance UAV
'The prototype blue-bellied, gray-backed tracer-bird with the wide-angle eye...'
Honda's Tumblebug - The UNI-CUB beta
'A tumblebug does not give a man dignity...'
NASA's LADEE Enters Lunar Orbit
'... dust normally on the surface picks up and keeps a charge.'
3D Printing An Entire Car
"... Almost as good as the original it was printed from."
Aldebaran Robot Talks Like C3PO - Almost
'See Vee Threepio - Vee for versatility - at your service...'
Google's Skin Tattoo Lie Detector
'Three and a half centimetres in diameter, permanently fixed in the centre of his forehead.'
inFORM Dynamic Shape Output Device
Like that pushpin device you remember, but supercharged.
Owlet Vitals, The Future Of Baby Monitoring
'In every diaper there is a fine copper wire...'
Robert Heinlein, Your Personal Electric Helicopter Will Be Ready In 2016
"They were half way home when a single flyer, hopping free in a copter harness, approached the little parade."
WildCat Runs Faster Than You, Untethered
'...moving with such drifting ease that it was like a single solid cloud of black-grey smoke blown at him in silence.' Almost.
HiBot's ACM-R5H Robot Video Shows Graceful Terminator-Style Swimming
'No! No! Aaaaaaarrrrrrgh!'
tDCS Jumpstarts Your Future
'We invented a scanner that can change the labyrinthine neural connections of the brain by tiny electronic impulses...'.
RealView Interactive Live Medical Holography
Surgeons can see an organ in its entirety in a live image.
Britney Spears And Lynn Minmay - Weapons Of Choice
An attack can take many forms.
Aireal Haptics Inching Towards Holodeck Experience
How to feel something that isn't there?
Starchase Pursuit Management ala Star Wars
Yes, but does it follow evil doers through hyperspace?
More SF in the News Stories
More Beyond Technovelgy science news stories