scitation.aip.org
Just interested to hear what other physicists think of this paper. I just found it while looking for something else about EM waves, and it looked interesting.
I'll give you the tl;dr of the paper: EM Drives produce exhaust, thus not violating physical laws.
Also, I understand the skepticism. I was and still am doubtful that the EM Drive is anything more than /pop/sci hopes and dreams, but please read the paper before you /sage/
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According to the researchers, the exhaust being blasted out is actually light, photons that have become paired up with another out-of-phase photon in order to shoot out of the metal cavity and produce thrust.
>the two photons in those pairs are out of phase and have no net electromagnetic field.
>the exhaust photons become invisible from an electromagnetic point of view because they're being masked by their out-of-sync partner.
SO it shoots photons out the back.
How is this different from just having a source of light pointing out the back of your spaceship? Is the meme drive more efficient at creating photons than leds?
Do pairs of out-of-phase photons have less energy than the 2 would have separately?
you would need 100 000 times more energy than this thing is using to create enough photons for the measured thrust.
That's what I was thinking too. OH BOY THERE'S THE SAME AMOUNT OF THRUST AS THERE WOULD BE IF YOU OPENED UP A MICROWAVE OVEN!
I like how every time I've asked "well what if things like photons and electrons are flying out, wouldn't that make thrust?" and then everyone here screamed that was stupid.
I wasn't even suggesting the EM drive is a good idea, it was just a question that apparently somebody with an actual relevant degree answered.
it is stupid, this whole thing is stupid. that article is stupid.
if it does produce photons its just a photon rocket, but then its still breaking the laws of physics because the amount of photons needed for the measured thrust has more energy than is put in to it.
I find the theoretical part more interesting and compelling than the EMdrive specifics. This idea of paired photons embodying the vacuum is pretty damn elegant, and explains spontaneous virtual particles and other quantum bullshit quite naturally. de Broglie will be vindicated soon enough.
>that article is stupid.
It's not an article... This is an American Institute of Physics site, it's where papers are published.
Do you even have a degree?
>if it does produce photons its just a photon rocket, but then its still breaking the laws of physics because the amount of photons needed for the measured thrust has more energy than is put in to it.
How, exactly? Explain carefully, if you can.
The meme drive using 1J of energy to produce 0.0001Ns of momentum. If this is from photons then using [math] E = pc [/math] means the photons out the back contains E = 0.0001*300000000 = 30kJ of energy
So this thing is somehow creating 30 000 times the energy it uses.
Seems legit
Is this different than electrogravitics which has been known about since the 1920s?
en.m.wikipedia.org
In the 50s, every major aerospace company was working on electrogravitics, then you just stopped hearing about it. I presume it's just another technology that graduated to the world of black budgets.
mfw this is a century old technology.