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Comment The article claims crystals are motionless (Score 3, Interesting) 242

in their ground state.

Usually when a material is in ground state, also known as the zero-point energy of a system, it means movement should theoretically be impossible, because that would require it to expend energy.

However, that would violate quantum electrodynamics, because then you would know the atoms exact momentum and location.

Submission + - SPAM: New possible explanation for the 'impossible' RF resonant cavity thruster

jkechel writes: The thrust produced by the RF resonant cavity thruster is due to a specific arrangement of magnetic and electric alternating fields.
The basics of this theory (*1) rely on charged particles near the thruster, an thus does not believe in 'reactionless' behaviour but give an explanation that requires charged particles near the thruster that are accelerated.

The mode of operation is described as follows:

1. alternating electric-fields make charged particles to swing
2. lighter particles like electrons swing at higher veolicities than heavier particles like protons
3. another alternating magnetic field (at the same frequency) results in a lorentz-force that always accelerates the swinging particles into the same direction
4. as heavier particles swing at lower velocities, the overall force / acceleration into one direction is greater than the other as the lorentz-force depends on velocity

The referenced description also includes a free Particle Simulator on GitHub (*2) to simulate the effect yourself.
*1: [spam URL stripped]...
*2: [spam URL stripped]...

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