Imagine trying to shave in one of these mirrors!
On Dec 2, 3:33 pm, archytas <[email protected]> wrote: > and maybe remember these mirrors are moving at quarter light-speed! > and that, in principle, we could gang together and do this one - the > concrete alone at CERN would be beyond our 'collective backs'. > > On Dec 2, 2:07 pm, Pat <[email protected]> wrote: > > > > > > > > > On Dec 1, 7:25 am, Allan H <[email protected]> wrote: > > > > I personally think CERN project is amazing,, and I appreciate the tidbit > > > of explanation as it really does allow me to visualize that is happening.. > > > I would never have thought of using a magnetic field as a mirror. > > > > the whole project is amazing thank you > > > Allan > > > Funny, a deck of Tarot cards is simply a deck of mirrors when used > > properly. Remember, the universe is holographic and mirrors abound > > throughout it. > > > > On Thu, Dec 1, 2011 at 1:39 AM, archytas <[email protected]> wrote: > > > > I tend to like science that doesn't require building vast entities > > > > like the LHC at CERN. Stuff I could do on the kitchen table is more > > > > my scene and hopefully simple enough to show my grandson, at least in > > > > principle. > > > > Wilson, C., Johansson, G., Pourkabirian, A., Simoen, M., Johansson, > > > > J., Duty, T., Nori, F., & Delsing, P. (2011). Observation of the > > > > dynamical Casimir effect in a superconducting circuit Nature, 479 > > > > (7373), 376-379 DOI: 10.1038/nature10561 > > > > is an example - though I actually can't do this one. > > > > > I went through undergraduate chemistry "knowing" about virtual > > > > particles, though I mistakenly thought they were accounting devices > > > > rather than real. I "knew" too that vacuums were full of such stuff. > > > > The thought experiments all seemed undoable. Here's a description of > > > > the plucking light from vacuum job. > > > > > "In addition, there is also the dynamic Casimir effect. This occurs if > > > > the mirrors are moving very fast so that the electromagnetic field in- > > > > between has no time to adjust. Instead, the ripples in the field > > > > caused by the fast mirror movement lead to the emission of a light > > > > particle. Basically, the mirrors create light out of the > > > > electromagnetic field in a similar way that a guitar player generates > > > > sounds from plucking a string. The problem with the experimental > > > > realization of the dynamic Casimir effect is that the mirrors need to > > > > move seriously fast. Otherwise the system has time to adjust to the > > > > new geometry of the mirrors, and no light will be excited. We are > > > > talking about speeds close to the speed of light! > > > > > Such fast mirror movements are simply not possible with mechanical > > > > mirrors. What is needed is an analogue that changes the dimension of > > > > the vacuum by other means. Fortunately, such systems exist in > > > > superconducting circuits, where magnetic fields applied to a so-called > > > > SQUID circuit on a chip achieve the same moving mirror function for > > > > electromagnetic fields. Moreover, fast-changing magnetic fields are no > > > > problem to create. In the present experiment the mirrors ‘move’ at a > > > > quarter of the speed of light, which corresponds to a driving > > > > frequency for the magnetic field of more than 10 gigahertz. The > > > > dynamic Casimir is clearly observed, with light being generated at the > > > > expected frequencies. > > > > > This is certainly a beautiful study confirming the intriguing > > > > properties of quantum mechanics. And what’s more, it doesn’t need > > > > Hawking’s black holes to experiment with them, all that’s needed is a > > > > table-top setup of superconducting circuits. This ease of > > > > experimentation will make sure we will learn much more about these > > > > virtual fluctuations in vacuum from future experiments." > > > > > As a kid I used to hear that money could not be produced from thin air > > > > and such - these days it seems more and more of what was nothing > > > > actually is something. > > > > -- > > > ( > > > ) > > > |_D Allan > > > > Life is for moral, ethical and truthful living.- Hide quoted text - > > > > - Show quoted text -
