After crunching some serious
number and working on equations, a University of British Columbia researcher
has developed a mathematical model for a practical time machine --a bubble of
space-time geometry which transports its contents backward and forwards 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, permitting it to
move backward in time.

Ben Tippett, a mathematics
and physics professor, whose area of expertise is Einstein's theory of general
relativity, works on black holes and science fiction when he's not teaching. With
the help of math and physics, he has generated 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's 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 remained a steady theme in science fiction. But in reality, it might
be more feasible than you’d think.

In 1915 Albert Einstein publicized
his theory of general relativity, declaring 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 group of physics institutes and
research groups-- declared the detection of gravitational waves produced by
colliding black holes billions of lightyears away, confirming Einstein's
theory.

The partition of space into
three dimensions, with time in a distinct dimension by itself, is inappropriate,
says Tippett. The four dimensions must be abstracted concurrently, where
different directions are linked, 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, planets and stars 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 says "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 Traversable Acausal 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.