(...)photons are said to be mediators between charge interactions.
Quote from: spupeng7 on 10/05/2017 02:08 amsanman,gravity and inertia are inextricably linked by the principle of equivalence and by their common dependence upon the depth of the gravitational field within which their mechanism acts. By this I mean that gravitational and inertial mass are phenomena whose weight varies with depth into the gravitational field.Is that correct? When you say weight I assume you mean mass. Mass captured in a gravitational field does not gain additional mass merely as a result of the gravitational field itself, does it? Isn't more an increase in the density of the material, rather than gaining of additional mass?Isn't the accretion of mass more due to acceleration at relativistic speeds, or boson interactions enabling energy conversion to mass?
sanman,gravity and inertia are inextricably linked by the principle of equivalence and by their common dependence upon the depth of the gravitational field within which their mechanism acts. By this I mean that gravitational and inertial mass are phenomena whose weight varies with depth into the gravitational field.
So we know that a box of photons is massive even though each individual photon is massless.I was reading this today and it dawned on me that there must also be a mass defect in an EMdrive, as there is in any bound system. https://www.sciencealert.com/physicists-have-detected-a-friction-like-force-in-a-perfect-vacuumhttps://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.053601
FWIW, the unscientific straw poll has come to an end, being responded to by 59 people. The majority (~66%) believe the Emdrive produces thrust with Mach Effect being the favourite single reason.
I had an issue with the linear actuator leaking RF. So I redesigned the small end to be better sealed, while maintaining the ability to move the antenna up and down inside the cavity for impedance matching. I was able to design, print, assemble, and tune a new small end within a single 24 hour period.
Quote from: Bob Woods on 10/05/2017 03:55 amQuote from: spupeng7 on 10/05/2017 02:08 amsanman,gravity and inertia are inextricably linked by the principle of equivalence and by their common dependence upon the depth of the gravitational field within which their mechanism acts. By this I mean that gravitational and inertial mass are phenomena whose weight varies with depth into the gravitational field.Is that correct? When you say weight I assume you mean mass. Mass captured in a gravitational field does not gain additional mass merely as a result of the gravitational field itself, does it? Isn't more an increase in the density of the material, rather than gaining of additional mass?Isn't the accretion of mass more due to acceleration at relativistic speeds, or boson interactions enabling energy conversion to mass?Bob,mass is conserved. Weight is dependent upon the local acceleration due to gravity, non?
If a pilot wave does explain the thrust behind the device, then it could also lead to a way to make the propulsion system even more powerful in future, and it's as simple as tweaking the shape."We have seen that the effect could be enhanced using a different shape for the frustum," said Castro. "In fact a trumpet exponential form is expected to increase the thrust."
New article on the EMDrive about modelling using pilot-wave theory and it claims the results are compatible with thrust generation:https://www.sciencealert.com/physicists-have-a-weird-new-idea-about-how-the-impossible-em-drive-could-produce-thrustThe paper referenced in the article is behind a paywall.
From the article:QuoteIf a pilot wave does explain the thrust behind the device, then it could also lead to a way to make the propulsion system even more powerful in future, and it's as simple as tweaking the shape."We have seen that the effect could be enhanced using a different shape for the frustum," said Castro. "In fact a trumpet exponential form is expected to increase the thrust."What the heck is a trumpet exponential form? What does it look like?Would it be where the frustum walls curve inward, like near the mouth of a trumpet?Technically, the mouth of a trumpet is called the "bell" - an ironically appropriate name - and one with a better ring to it than "frustum".Heh - so even a propellantless rocket still needs a bell, huh? Especially when it uses non-local hidden variables to satisfy Bell's theorem? Hey Monomorphic, TheTraveler, or whoever - is it possible to run this shape through your analytical software and produce a graphical render from it?
Hey Monomorphic, TheTraveler, or whoever - is it possible to run this shape through your analytical software and produce a graphical render from it?
Quote from: sanman on 10/08/2017 08:07 amHey Monomorphic, TheTraveler, or whoever - is it possible to run this shape through your analytical software and produce a graphical render from it?I know a trumpet shape has been looked at before due to the geometry being highly asymmetric. Most recently user "Kenjee" posted some images of COMSOL runs using this geometry. I couldn't locate them but perhaps he will be kind enough to repost.