Science Fiction
Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 |
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 |
Would
you like to contribute a story tip?
It's easy:
Get the URL of the story, and the related sf author, and add
it here.
Comment/Join discussion ( 4 )
Related News Stories - (" Space Tech ")
Is China Mining Helium-3 On The Moon's Farside?
'...for months Grantline bores had dug into the cliff.' -
Solitary Black Hole Wanders In Space
'...the Hole is something like a vortex or a whirlpool?' - Frank K. Kelly, 1935.
Spaceplane From Virgin Atlantic
'ZARNAK, YOU'RE TO COMMAND A SCOUTING EXPEDITION --- FIND OUT WHAT THIS IS ALL ABOUT!'
Taikonauts Exercise In China's Tiangong Space Station
'Joe got out the gravity-simulator harnesses...' - Murray Leinster, 1953.
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.
Science Fiction
Timeline
1600-1899
1900-1939
1940's 1950's
1960's 1970's
1980's 1990's
2000's 2010's
Current News
LLM 'Cognitive Core' Now Evolving
'Their only check on the growth and development of Vulcan 3 lay in two clues: the amount of rock thrown up to the surface... and the amount of the raw materials and tools and parts which the computer requested.'
Has Elon Musk Given Up On Mars?
'There ain't no such thing as a free lunch.'
Bacteria Turns Plastic Into Pain Relief? That Gives Me An Idea.
'I guess there's nobody round this table who doesn't have a Crosswell [tapeworm] working for him in the small intestine.'
When Your Child's Best Friend Is An AI
'Figments of his mind in one sense, of course, for he had shaped them...'
China's Drone Mothership Can Carry 100 Drones
'So the parent drone carries a spotter that it launches...'
Drones Recharge In Mid-Air Like Jets Refuel!
'...nurse drones that would cruise around dumping large amounts of power into randomly selected pods.'
Australian Authors Reject AI Training Of Llama
'It's done with a flip of the third joint of the tentacle on the down beat.'
Is China Mining Helium-3 On The Moon's Farside?
'...for months Grantline bores had dug into the cliff.'
Maybe It's Too Soon To Require Autonomous Mode
'I hope all those other cars are on automatic,' he said anxiously.
Is Agentic AI The Wrong Kind Of Smartness?
'It’s smart enough to go wrong in very complicated ways, but not smart enough to help us find out what’s wrong.'
Heat Waver - The First Ever Combo Solar Collector And Wind Turbine
'...like a spray of tulips mounted fanwise.'
Tesla 'Fleet Response Agents' Bolster FSD Autonomy
'You hate the whole idea that some bored drone pusher in a remote driving centre has got your life... in his hands.'
Mori3 Autonomous Shapeshifting Robot
'My homeland is being threatened by the Replicators. Thus far all attempts to stop them have failed.'
Tesla Seeks 'Tesla Robotaxi' And 'Robobus' Trademarks Ignoring Prior Art
'A robobus had just rolled up to the curb.'
Scary Grid Safety Robots
'The ultimate horror for our paranoid culture...'
Does AI Provide A Way Forward For Talk Therapy
'And there in the next room by the sofa sat a familiar suitcase, that of his psychiatrist Dr. Smile.'
