WANT to zip across the galaxy, boldly going where no one has gone before? Then make sure your spaceship is fitted with enough shielding to protect you from all the radiation your 鈥渨arp drive鈥� travels will expose you to. So concludes Pedro Gonz谩lez-D铆颅az at the Institute of Fundamental Physics and Mathematics in Madrid, Spain.
The problem is that no one has a clue how to make a warp drive, or indeed if warp travel is even physically possible. In 1994, physicist Miguel Alcubierre of the University of Wales in Cardiff, UK, proposed that a spaceship could travel at speeds way beyond the speed of light. The way to make the necessary warp drive, he suggested, was to create a protective bubble with space-time bunched up in front of it and stretched out behind it.
Three years later, however, physicists calculated that such manipulations of space-time required more mass than is contained in the known universe. Such paltry problems did not perturb 鈥淎lcubierre drive鈥� enthusiasts. New and improved bunchings and stretchings of space-time have since been devised and, in 2000, Gonz谩lez-D铆颅az proposed his own solution: a mathematical configuration of space-time that he claimed was closer to being physically possible, if still not technologically feasible.
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Gonz谩lez-D铆az has now shown that his 鈥渨arp bubble鈥� effectively acts like the edge of a mini-universe, containing a space-time similar to that of the observable cosmos. This analogy, he hopes, may make warp-drive solutions more palatable to mainstream physics and may even mean that our universe could actually be a passenger inside its own 鈥渨arp drive鈥� bubble.
One hiccup, according to Gonz谩lez-D铆颅az鈥檚 calculations, is that the faster one of his imagined spaceships goes, the more radiation it would encounter from space itself (Physics Letters B, ).
Alcubierre drives, as well as wormholes, are actually predicted by relativity. They may be outlandish, says Gonz谩lez-D铆颅az, but so were black holes at one time. 鈥淲arp drives correspond to what one can consider real, well-established theoretical physics.鈥�
鈥淎lcubierre drives may be outlandish, but so were wormholes and even black holes at one time鈥�
Roger Penrose, visiting professor of physics at Pennsylvania State University in University Park, agrees, 鈥渂ut only if we take it in the right spirit, as a theoretical exploration of the significance of Einstein鈥檚 theory, not as a potential means for actually building faster-than-light spaceships.鈥�
