1/12/2006

Hyperdrive engine theory

Take a leap into hyperspace

EVERY year, the American Institute of Aeronautics and Astronautics awards prizes for the best papers presented at its annual conference. Last year's winner in the nuclear and future flight category went to a paper calling for experimental tests of an astonishing new type of engine. According to the paper, this hyperdrive motor would propel a craft through another dimension at enormous speeds. It could leave Earth at lunchtime and get to the moon in time for dinner. There's just one catch: the idea relies on an obscure and largely unrecognised kind of physics. Can they possibly be serious?
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In the early 1950s, Heim began to rewrite the equations of general relativity in a quantum framework. He drew on Einstein's idea that the gravitational force emerges from the dimensions of space and time, but suggested that all fundamental forces, including electromagnetism, might emerge from a new, different set of dimensions. Originally he had four extra dimensions, but he discarded two of them believing that they did not produce any forces, and settled for adding a new two-dimensional "sub-space" onto Einstein's four-dimensional space-time.

In Heim's six-dimensional world, the forces of gravity and electromagnetism are coupled together. Even in our familiar four-dimensional world, we can see a link between the two forces through the behaviour of fundamental particles such as the electron. An electron has both mass and charge. When an electron falls under the pull of gravity its moving electric charge creates a magnetic field. And if you use an electromagnetic field to accelerate an electron you move the gravitational field associated with its mass. But in the four dimensions we know, you cannot change the strength of gravity simply by cranking up the electromagnetic field.

In Heim's view of space and time, this limitation disappears. He claimed it is possible to convert electromagnetic energy into gravitational and back again, and speculated that a rotating magnetic field could reduce the influence of gravity on a spacecraft enough for it to take off.
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Dröscher looked again at Heim's ideas and produced an "extended" version, resurrecting the dimensions that Heim originally discarded. The result is "Heim-Dröscher space", a mathematical description of an eight-dimensional universe.

From this, Dröscher claims, you can derive the four forces known in physics: the gravitational and electromagnetic forces, and the strong and weak nuclear forces. But there's more to it than that. "If Heim's picture is to make sense," Dröscher says, "we are forced to postulate two more fundamental forces." These are, Dröscher claims, related to the familiar gravitational force: one is a repulsive anti-gravity similar to the dark energy that appears to be causing the universe's expansion to accelerate. And the other might be used to accelerate a spacecraft without any rocket fuel.

This force is a result of the interaction of Heim's fifth and sixth dimensions and the extra dimensions that Dröscher introduced. It produces pairs of "gravitophotons", particles that mediate the interconversion of electromagnetic and gravitational energy.
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Claims of the possibility of "gravity reduction" or "anti-gravity" induced by magnetic fields have been investigated by NASA before (New Scientist, 12 January 2002, p 24). But this one, Dröscher insists, is different. "Our theory is not about anti-gravity. It's about completely new fields with new properties," he says.
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This will require a huge rotating ring placed above a superconducting coil to create an intense magnetic field. With a large enough current in the coil, and a large enough magnetic field, Dröscher claims the electromagnetic force can reduce the gravitational pull on the ring to the point where it floats free... With a faster-spinning ring and an even stronger magnetic field, gravitophotons would interact with conventional gravity to produce a repulsive anti-gravity force, they suggest.

Dröscher is hazy about the details, but he suggests that a spacecraft fitted with a coil and ring could be propelled into a multidimensional hyperspace. Here the constants of nature could be different, and even the speed of light could be several times faster than we experience. If this happens, it would be possible to reach Mars in less than 3 hours and a star 11 light years away in only 80 days, Dröscher and Häuser say.

So is this all fanciful nonsense, or a revolution in the making? The majority of physicists have never heard of Heim theory, and most of those contacted by New Scientist said they couldn't make sense of Dröscher and Häuser's description of the theory behind their proposed experiment.
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The general consensus seems to be that Dröscher and Häuser's theory is incomplete at best, and certainly extremely difficult to follow. And it has not passed any normal form of peer review, a fact that surprised the AIAA prize reviewers when they made their decision. "It seemed to be quite developed and ready for such publication," Mikellides told New Scientist.

At the moment, the main reason for taking the proposal seriously must be Heim theory's uncannily successful prediction of particle masses. Maybe, just maybe, Heim theory really does have something to contribute to modern physics. "As far as I understand it, Heim theory is ingenious," says Hans Theodor Auerbach, a theoretical physicist at the Swiss Federal Institute of Technology in Zurich who worked with Heim. "I think that physics will take this direction in the future."

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