Bubble of Spacetime --"A 'Time Machine' That Moves Greater Than Speed of Light Allowing
It to Travel Back and Forward in Time"
After some serious number crunching, a University of British Columbia researcher has come up
with a mathematical model for a viable time machine --a bubble of space-time geometry
which carries its contents backward and forwards through space and time as it tours a large
circular path.
The bubble moves through space-time at speeds greater than the speed of light at times,
allowing it to move backward in time.
Ben Tippett, a mathematics and physics instructor, whose field of expertise is Einstein's theory
of general relativity, studies black holes and science fiction when he's not teaching.
Using math and physics, he has created a formula that describes a method for time travel.
"People think of time travel as something as fiction," says Tippett.
"And we tend to think it's not possible because we don't actually do it.
But, mathematically, it is possible."
Ever since HG Wells published his book Time Machine in 1885, people have been curious
about time travel--and scientists have worked to solve or disprove the theory, he says.
In 1915 Albert Einstein announced his theory of general relativity, stating that gravitational
fields are caused by distortions in the fabric of space and time.
More than 100 years later, the LIGO Scientific Collaboration--an international team of physics
institutes and research groups--announced the detection of gravitational waves generated
by colliding black holes billions of lightyears away, confirming Einstein's theory.
The division of space into three dimensions, with time in a separate dimension by itself,
is incorrect, says Tippett.
The four dimensions should be imagined simultaneously, where different directions are connected,
as a space-time continuum.
Using Einstein's theory, Tippett says that the curvature of space-time accounts for the
curved orbits of the planets.
In "flat" -- or uncurved -- space-time, planets and stars would move in straight lines.
In the vicinity of a massive star, space-time geometry becomes curved and the straight trajectories
of nearby planets will follow the curvature and bend around star.
"The time direction of the space-time surface also shows curvature.
There is evidence showing the closer to a black hole we get, time moves slower," says
Tippett.
"My model of a time machine uses the curved space-time -- to bend time into a circle for
the passengers, not in a straight line.
That circle takes us back in time."
While it is possible to describe this type of time travel using a mathematical equation,
Tippett doubts that anyone will ever build a machine to make it work.
"HG Wells popularized the term 'time machine' and he left people with the thought that an
explorer would need a 'machine or special box' to actually accomplish time travel,"
Tippett says.
"While is it mathematically feasible, it is not yet possible to build a space-time machine
because we need materials--which we call exotic matter--to bend space-time in these impossible
ways, but they have yet to be discovered."
For his research, Tippett created a mathematical model of a Traversable Acausal Retrograde
Domain in Space-time (TARDIS).
He describes it as a bubble of space-time geometry which carries its contents backward
and forwards through space and time as it tours a large circular path.
The bubble moves through space-time at speeds greater than the speed of light at times,
allowing it to move backward in time.
"Studying space-time is both fascinating and problematic.
And it's also a fun way to use math and physics," says Tippett.
"Experts in my field have been exploring the possibility of mathematical time machines
since 1949.
And my research presents a new method for doing it."
Hubble image of an enormous bubble at top of the page being blown into space by a super-hot,
massive star.
The Bubble Nebula, or NGC 7635, was chosen to mark the 26th anniversary of the launch
of Hubble into Earth orbit by the STS-31 space shuttle crew on April 24, 1990.
The Daily Galaxy via University of British Columbia
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