Quote from: marshallC on 07/13/2015 04:21 pmA question popped into my head today - can photons collide/interfere, and if so,...I can't answer your latter questions, but I can answer this one.Yes, photons can collide and interfere. One of the really fascinating things about light is that it can, in photon-photon interactions, behave as if it has no mass, positive mass, or negative mass. For all of these cases, F=mA still applies. If you interact a photon in positive mass mode with a photon in negative mass mode then you can have two photons exit the collision moving in the same direction. This is real, measurable, and breaks the symmetry of Newtons 3rd law [1].(end of facts, beginning wild supposition here)The above effect leads directly to my theory du jour for the operating principle of the emDrive. The asymmetric resonator is creating a standing wave of photons producing identical radiation pressure on the front and rear endplates. Some light is leaking into the space at the small end and is trapped bouncing back and forth between the standing waves (no radiation pressure) and the small end (radiation pressure). This latter light is what moves the drive. The reflectivity of the small end and the strength of the standing wave determine the "lifespan" of the trapped light and explain the correlation between Q and thrust.I have a few ideas on proving this, but nothing substantial yet.[1] Optical diametric drive acceleration through action–reaction symmetry breaking - Martin Wimmer, Alois Regensburger, Christoph Bersch, Mohammad-Ali Miri, Sascha Batz, Georgy Onishchukov, Demetrios N. Christodoulides & Ulf Peschel http://www.nature.com/nphys/journal/v9/n12/full/nphys2777.html(If your local library has ebscohost, it is available there in full text.)
A question popped into my head today - can photons collide/interfere, and if so,...
Quote from: Rodal on 07/13/2015 03:27 pmQuote from: SeeShells on 07/13/2015 02:51 pmI posted a Danger alert and it went poof. Summary as I'll try again, weird.I asked why the shape of the calculated stress values were shaped around the antenna like they were, squeezed in the forward accelerating direction and flattened out to the sides.It reminds me of Einstein effects for an object approaching the speed of light. Interesting all other meep views were of this nice round antenna shape.Just wondering how that compressed stress took that shape.ShellI don't recall Meep views of a round antenna shape. The antenna is much longer in one direction and has a "thickness" of only 2 Finite Difference nodes.So, viewed from one side the antenna looks like a line, and when looked from the perpendicular view it looks like a point (or a very small circle of just 2 Finite Difference nodes).When plotting the stress as the height of the "line antenna" the stress looks like a plate with rounded corners at the top.Could you please link to the message, or even better copy and paste the round antenna image in your response ?I need to see the 2 images you are referring to as a picture is worth a thousand words.ThanksYou 're quite right the antenna is being shown in the horizontal plane not the vertical. I asked the question nicely and did say it was a danger alert. It is the exact way it should be and nothing is funny about it. Edit: added the picture of the vertical antenna of the poynting vector you calculated associated the 2 and did a divide by 0.
Quote from: SeeShells on 07/13/2015 02:51 pmI posted a Danger alert and it went poof. Summary as I'll try again, weird.I asked why the shape of the calculated stress values were shaped around the antenna like they were, squeezed in the forward accelerating direction and flattened out to the sides.It reminds me of Einstein effects for an object approaching the speed of light. Interesting all other meep views were of this nice round antenna shape.Just wondering how that compressed stress took that shape.ShellI don't recall Meep views of a round antenna shape. The antenna is much longer in one direction and has a "thickness" of only 2 Finite Difference nodes.So, viewed from one side the antenna looks like a line, and when looked from the perpendicular view it looks like a point (or a very small circle of just 2 Finite Difference nodes).When plotting the stress as the height of the "line antenna" the stress looks like a plate with rounded corners at the top.Could you please link to the message, or even better copy and paste the round antenna image in your response ?I need to see the 2 images you are referring to as a picture is worth a thousand words.Thanks
I posted a Danger alert and it went poof. Summary as I'll try again, weird.I asked why the shape of the calculated stress values were shaped around the antenna like they were, squeezed in the forward accelerating direction and flattened out to the sides.It reminds me of Einstein effects for an object approaching the speed of light. Interesting all other meep views were of this nice round antenna shape.Just wondering how that compressed stress took that shape.Shell
Quote from: ElizabethGreene on 07/13/2015 05:42 pmQuote from: marshallC on 07/13/2015 04:21 pmA question popped into my head today - can photons collide/interfere, and if so,...I can't answer your latter questions, but I can answer this one.Yes, photons can collide and interfere. One of the really fascinating things about light is that it can, in photon-photon interactions, behave as if it has no mass, positive mass, or negative mass. For all of these cases, F=mA still applies. If you interact a photon in positive mass mode with a photon in negative mass mode then you can have two photons exit the collision moving in the same direction. This is real, measurable, and breaks the symmetry of Newtons 3rd law [1].(end of facts, beginning wild supposition here)The above effect leads directly to my theory du jour for the operating principle of the emDrive. The asymmetric resonator is creating a standing wave of photons producing identical radiation pressure on the front and rear endplates. Some light is leaking into the space at the small end and is trapped bouncing back and forth between the standing waves (no radiation pressure) and the small end (radiation pressure). This latter light is what moves the drive. The reflectivity of the small end and the strength of the standing wave determine the "lifespan" of the trapped light and explain the correlation between Q and thrust.I have a few ideas on proving this, but nothing substantial yet.[1] Optical diametric drive acceleration through action–reaction symmetry breaking - Martin Wimmer, Alois Regensburger, Christoph Bersch, Mohammad-Ali Miri, Sascha Batz, Georgy Onishchukov, Demetrios N. Christodoulides & Ulf Peschel http://www.nature.com/nphys/journal/v9/n12/full/nphys2777.html(If your local library has ebscohost, it is available there in full text.)Yabut, this is lattice optics. It requires the presence of a medium in order to get these funky effects. For every apparent violation of conservation laws, there is a compensating dynamic invoked on the medium itself, so that the system as a whole is well-behaved. This cannot happen inside an empty cavity.
....Why are all of these new plots looking more and more like those for the Alcubierre metric?Rip
Quote from: deltaMass on 07/13/2015 08:45 pmQuote from: ElizabethGreene on 07/13/2015 05:42 pmQuote from: marshallC on 07/13/2015 04:21 pmA question popped into my head today - can photons collide/interfere, and if so,...I can't answer your latter questions, but I can answer this one.Yes, photons can collide and interfere. One of the really fascinating things about light is that it can, in photon-photon interactions, behave as if it has no mass, positive mass, or negative mass. For all of these cases, F=mA still applies. If you interact a photon in positive mass mode with a photon in negative mass mode then you can have two photons exit the collision moving in the same direction. This is real, measurable, and breaks the symmetry of Newtons 3rd law [1].(end of facts, beginning wild supposition here)The above effect leads directly to my theory du jour for the operating principle of the emDrive. The asymmetric resonator is creating a standing wave of photons producing identical radiation pressure on the front and rear endplates. Some light is leaking into the space at the small end and is trapped bouncing back and forth between the standing waves (no radiation pressure) and the small end (radiation pressure). This latter light is what moves the drive. The reflectivity of the small end and the strength of the standing wave determine the "lifespan" of the trapped light and explain the correlation between Q and thrust.I have a few ideas on proving this, but nothing substantial yet.[1] Optical diametric drive acceleration through action–reaction symmetry breaking - Martin Wimmer, Alois Regensburger, Christoph Bersch, Mohammad-Ali Miri, Sascha Batz, Georgy Onishchukov, Demetrios N. Christodoulides & Ulf Peschel http://www.nature.com/nphys/journal/v9/n12/full/nphys2777.html(If your local library has ebscohost, it is available there in full text.)Yabut, this is lattice optics. It requires the presence of a medium in order to get these funky effects. For every apparent violation of conservation laws, there is a compensating dynamic invoked on the medium itself, so that the system as a whole is well-behaved. This cannot happen inside an empty cavity.As far as I understand, the cavity is not empty. It has air.Have we ruled out that the gases inside the cavity have something to do with any potential thrust?Yes, I'm aware that something that works only with air inside and outside sounds bad, by implying this only works like a lifter. But has anyone tested if having air inside an air tight cavity running with vacuum outside changes anything?
Yabut, this is lattice optics. It requires the presence of a medium in order to get these funky effects. For every apparent violation of conservation laws, there is a compensating dynamic invoked on the medium itself, so that the system as a whole is well-behaved. This cannot happen inside an empty cavity.
Quote from: rq3 on 07/13/2015 09:14 pm....Why are all of these new plots looking more and more like those for the Alcubierre metric?RipBecause man/woman is a being who rose among all others on Earth by his/her ability to see patterns. So we see patterns everywhere (the face on Mars, canals on Mars, trees on Mars, etc.) even when those patterns are just a mirage.
Quote from: tchernik on 07/13/2015 09:16 pmAs far as I understand, the cavity is not empty. It has air.Have we ruled out that the gases inside the cavity have something to do with any potential thrust?Yes, I'm aware that something that works only with air inside and outside sounds bad, by implying this only works like a lifter. But has anyone tested if having air inside an air tight cavity running with vacuum outside changes anything?Discussed in threads 1 & 2...
As far as I understand, the cavity is not empty. It has air.Have we ruled out that the gases inside the cavity have something to do with any potential thrust?Yes, I'm aware that something that works only with air inside and outside sounds bad, by implying this only works like a lifter. But has anyone tested if having air inside an air tight cavity running with vacuum outside changes anything?
2) Is user apoc2021's generous offer to donate server time still open?
On the other hand testers from prestigious institutions : first NASA and now Prof. Tajmar at TU Dresden University, Germany, tested in vacuum and obtained thrust that is orders of magnitude smaller than those reported by Shawyer and Yang.
Quote from: WarpTech on 07/13/2015 04:22 amResolution of the Space-Drive Energy Paradox (version 6) Have at it @deltaMass and @wallofwolfstreet. I'm looking forward to your responses. https://www.dropbox.com/s/p86dvc8733h9iph/Desiato-Energy_Paradox-v6.pdf?dl=0Todd<<crickets>>
Resolution of the Space-Drive Energy Paradox (version 6) Have at it @deltaMass and @wallofwolfstreet. I'm looking forward to your responses. https://www.dropbox.com/s/p86dvc8733h9iph/Desiato-Energy_Paradox-v6.pdf?dl=0Todd
I have just installed MEEP and NSF-1701.ctl is sitting here on my hard drive.How can I help?