Warp Drive Engine Would Travel Faster Than Light
Date: Tuesday, August 12th, 2008 (CST )
Topic: Science
 It is possible to travel faster than light. You just wouldn't travel faster than light. Seems strange, but by manipulating extra dimensions with astronomical amounts of energy, two Baylor University physicists have outlined how a faster-than-light engine, or warp drive, could be created that would bend but not break the laws of physics.
"We think we can create an effective warp drive, based on general relatively and string theory," said Gerald Cleaver, coauthor of the paper that recently appeared on the preprint server ArXiv.org
The warp engine is based on a design first proposed in1994 by Michael Alcubierre. The Alcubierre drive, as it's known, involves expanding the fabric of space behind a ship into a bubble and shrinking space-time in front of the ship. The ship would rest in between the expanding and shrinking space-time, essentially surfing down the side of the bubble.
The tricky
part is that the ship wouldn't actually move; space itself would move
underneath the stationary spacecraft. A beam of light next to the ship
would still zoom away, same as it always does, but a beam of light far
from the ship would be left behind.
That means that the ship
would arrive at its destination faster than a beam of light traveling
the same distance, but without violating Einstein's relativity, which
says that it would take an infinite amount of energy to accelerate an
object with mass to the speed of light, since the ship itself isn't
actually moving.
The fabric of space has
moved faster than light before, says Cleaver, right after the Big Bang,
when the universe expanded faster than the speed of light.
"We're recreating the inflationary period of the universe behind the ship," said Cleaver.
While the theory rests on
relatively firm ground, the next question is how do you expand space
behind the ship and contract it in front of the ship?
Cleaver and Richard Obousy,
the other coauthor, propose manipulating the 11th dimension, a special
theoretical construct of m-theory (the offspring of string theory), to
create the bubble the ship would surf down.
If the 11th dimension could
be shrunk behind the ship it would create a bubble of dark energy, the
same dark energy that is causing the universe to speed up as time goes
on. Expanding the 11th dimension in front of the ship would eventually
cause it to decrease, although two separate steps are required.
Exactly how the 11th dimension would be expanded and shrunk is still unknown.
"These calculations are
based on some arbitrary advance in technology or some alien technology
that would let us manipulate the extra dimension," said Cleaver.
What the scientists were
able to estimate was the amount of energy necessary, if the technology
was available, to change these dimensions: about 10^45 joules.
"That's about the amount of
energy you'd get if you converted the entire mass of Jupiter into pure
energy via E = mc^2," said Cleaver, an energy far beyond anything
humanity can currently envision creating.
While the challenges to
creating a warp drive are quite formidable, the concept is intriguing,
says Tufts University theoretical physicist Lawrence Ford.
"If there are extra dimensions and we could manipulate them, that would open up all sorts of exciting possibilities," said Ford.
"I don't see this leading
immediately to a warp drive, but I could see it leading to other
interesting possibilities in basic scientific research," said Ford.
Cleaver agrees that the creation of a real warp drive is still far away.
"Warp drive isn't doable now, and probably won't be for the next several millenia," said Cleaver.
Copyright: Discovery News
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