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Old 06-02-2014, 06:05 AM
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Default Latest ultrasound tractor beam

Tractor beams based on ultrasound have been made before, but move only tiny particles with great effort. Researchers at Dundee University have recently beat that record a millionfold, Of course, it wouldn't work in space

Story at eCanadaNow
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Old 06-02-2014, 03:25 PM
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Unfortunately, all that has nothing to do with the tractor beam. This still a pushing beam from two sides onto a suitably shaped object...
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Old 06-02-2014, 05:42 PM
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Well, NASA's story about trying to make tractor beams is three years old, and what has come of it?
NASA Studying Ways to Make 'Tractor Beams' a Reality


If you buy into the theory that the universe is raining lightspeed gravitons in all directions with such density that they hold subatomic particles together and gravity is a minor consequence due to the partial shielding effect of a planet, then a tractor beam would have to continuously create a temporary graviton vacuum in front of an object one wishes to pull, which would be tantamount to producing a local gravity well into which gravitons from the opposite direction would push the object.

In that theory, gravitons would act allow objects to coast unabated but act as speed bumps in the case of acceleration, pressing on the face of someone riding a rocket sled and not allowing rockets to reach the speed of light. Neutron stars are said to have surface gravity of nearly 100 billion g, making this notion of gravitons attractive, but trying to turn that into an acceptable theory of quantum gravity can cause severe hair loss.
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