Dr. Gerald Cleaver, associate professor of physics at Baylor University, and Richard Obousy, a Baylor graduate student, theorize that by manipulating the extra spatial dimensions of string theory around a spaceship with an extremely large amount of energy, it would create a "bubble" that could cause the ship to travel faster than the speed of light. To create this bubble, the physicists believe manipulating the 10th spatial dimension would alter the dark energy in three large spatial dimensions: height, width and length. Cleaver said positive dark energy is currently responsible for speeding up the expansion rate of our universe as time moves on.
WIKI
Another way.......
Their article 'Inertia as a Zero-Point Field Lorentz Force' appeared in the February 1, 1994 issue of the eminent journal Physical Review A, and it offered a radically new interpretation of the origin of the strange quality of inertia.
This new concept of inertia also points to a new understanding of gravity, since gravity and inertia are inextricably intertwined. Hal Putoff goes even further. Pointing to recent success in manipulating atomic processes by controlling zero-point fields in the lab, Puthoff says "If we are right that both gravity and inertia stem from the zero-point field, then someday we might be able to manipulate both."
This, In turn, means quite simply a warp drive. And Puthoff's idea is not merely a twinkle in physics's eye. In 1994 Miguel Alcubierre, a theoretical physicist at the University of Wales published a paper called "The Warp Drive: Hyper-Fast Travel Within General Relativity."
Alcubierre showed it is theoretically possible to distort space to allow warp speed travel: to literally expand the volume of space-time behind a starship, while compressing it up ahead -- like feeding a tent pole through its sleeve by bunching up the fabric ahead, and pulling it along behind.
Alcubierre showed that space-time can be similarly manipulated. The position of a starship within such a distortion would change, relative to its destination - yet the ship itself need not actually "move" at all.
http://www.ufoevidence.org/documents/doc1108.htm