After chewing some serious number and working on equations, a University
of British Columbia scientist has developed a mathematical model for a
practical time machine --a bubble of space-time geometry which carryings its
contents forward and backwards through space and time as it circuits a large
circular path. The bubble travels through space-time at speeds faster than the
speed of light at times, allowing it to move backward in time.

Ben Tippett, a physics and mathematics professor, whose region of
expertise is Einstein's theory of general relativity, works on science fictions
and black hole when he is not teaching. With the help of physics and math, he
has produced a formula that defines a technique for time travel.

Ben Tippett says "People think of time travel as something as
fiction. And we tend to think it is not possible because we don't actually do
it. But, mathematically, it is possible."

Since HG Wells first popularized the idea in 1885, time travel has continued
a stable theme in science fiction. But in reality, it might be more possible
than you’d think. In 1915 Albert
Einstein publicized his theory of general relativity, proclaiming that
gravitational fields are produced by bends in the fabric of space and time.

More than a century later, the LIGO Scientific Collaboration an
international team of physics institutes and research groups confirmed the discovery
of gravitational waves produced by colliding black holes billions of light years
away, proving Einstein's theory.

The partition of space into three dimensions, with time in a separate
dimension by itself, is unsuitable, says Tippett. The four dimensions must be inattentive
concomitantly, where different directions are related, as a space-time
continuum. With the help of 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, stars and planets would
travel in straight lines. In the neighborhood of a massive star, space-time
geometry turn into curved and the straight courses of neighboring planets will
follow the warp and bend around star.

Tippett says:

"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.
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."

It is likely to define this kind of time travel by means of a
mathematical equation, but it will surely take time.

He say:

"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. 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 study, Tippett formed a mathematical model of a TraversableAcausal Retrograde Domain in Space-time(TARDIS).

Tippett says:

"Studying space-time is both fascinating and problematic. And it's
also a fun way to use math and physics. 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 a massive bubble at top of the page being propelled into
space by a super-hot, massive star. The Bubble Nebula, or NGC 7635, was
selected to celebrate the 26th anniversary of the launch of Hubble into Earth
orbit by the STS-31 space shuttle crew on April 24, 1990.

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