Reply to post: Re: If the EM drive works it's not just physics that's broken but mathematics

Leaked paper suggests EM Drive tested by NASA actually works

Alan Johnson

Re: If the EM drive works it's not just physics that's broken but mathematics

Conservation laws, like the conservation of momentum that the EM drive would break if it works, can be derived mathematically, see Noether's theorem.

Yes but you have to assume Langragian mechanics or at least some action principle to do this and if you are going to make such a massive leap as conservation of momentum is broken then the whole basis of mechanics is undermined and you can forget an action principle/langragian etc. This is incredibly unlikely and the obvious explanation is just errors in the experiment. Arguing that you can derive conservation of momentum using Noether's theorem and symmetry is fine but to do it requires assuming a framework which is exactly what the observation if real would disprove.

An extraordinary claim like this requires extraordinary evidence and a single dodgy experiment with no peer review is not it. I think conservation of momentum will prevail.

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