Casimir Effects - Peter Milonni

[@chuckjordan6455]

14:20 re: Outside influences. How would you shield against cosmic rays?

[@nmarbletoe8210]

why would you need to?

[@MrGiuse72]

BRILLIANT LESSON! THESE ARE NOT BARE DETAILS . THIS IS VERY IMPORTANT DO POINT OUT AND INTERPRET IN THE RIGHT STYLE. At Uni no time was ever devolved to these clarifications about quantization and I kept forgetting about z.p.e. until I discovered 1+2+3+4+5+....n+... = -1/12 and this gave me a kick to go bakc and think ABOUT +1/2hw .....and that was an infinite and nevertheless we MUST account for it and adapt to wat it means. Thank you Prof. I appreciated a LOT the subtleties of first theorists thinking about quanta.

[@koenvanvlaenderen5568]

Perhaps a better Presentation title for this super interesting lecture: ZPE effects or ZP-radiation effects. The Casimir force is just one of the treated ZPE effects. It is often assumed ZP-Energy consists of TEM wave radiation, however, classical Maxwell-Lorentz theory can be generalised to allow for longitudinal electromagnetic wave modes (electric field is longitudinal, magnetic field is scalar, the scalar product of these fields represent a unidirectional energy flow). Such waves could have a different velocity in vacuum, and a have different energy/momentum ratio with respect to the TEM wave. A very important experimental fact is that the Coulomb near field is much faster than the speed of light. Louis de Broglie returned to his original Pilot wave theory at the end of his life and career (the dual wave solution, a subluminal particle 'velocity' wave and a superluminal pilot wave, that are two distinct wave types). Antony Valentini showed by means of computer simulations that the 'deterministic' version of QM, i.e. Bohm's pilot wave theory, is not stable: a statistical non-equilibrium velocity wave -pilot wave interaction does not relax quickly enough to a statistical equilibrium situation. However, De Broglie's Pilot wave mechanics theory is stable in computer simulations (fast relaxation). Born's rule can be expressed in the context of De Broglie's Pilot wave mechanics theory; Born's rule states that a particle is in statistical equilibrium with its pilot wave radiation background. This situation can be generalised to non-equilibrium statistics, such that Born's rule does not hold any more, and this is not longer equivalent with standard QM. This is what I learned from Valentini's papers, but his work does not tell me what Pilot waves are. If such waves are electrodynamic in nature, then we have a possibility for ZP-energy harvesting by means of nonlinear resonant quantum systems that are not in statistical equilibrium with the ZP-E 'pilot wave radiation background'. There is no experimental proof whatsoever for the statement that the ZPE has maximum entropy (cannot be increased), so we might as well assume that it is possible to technically increase the entropy of the ZPE without violating the second law of thermodynamics, or in other words, use ZP radiation energy as an energy source without violating the 2nd law of TD.

[@eddiexyx2]

Just started highschool and so have a limited quantitative understanding so was wondering if there is any physics I should learn except classical mechanics to start learning about the casimir force and quantum mechanics in general ?

[@vinitchauhan973]

Eddie Atonga I'm four years late but the theoretical minimum quantum mechanics book is quite good. However I do encourage you to learn classical mechanics.

[@HitAndMissLab]

How does one make a difference between the Kazimir's effect and ordinarily expected Van der Vallace forces between molecules? It was a common knowledge long before Kazimir that highly polished metal plates will stick to each other because molecular forces across the gap.

[@manipulativer]

van der wall is molecular, Casimir effect is electric thus it needs a conductor. You can stick 2 perfectly polished non conductors and they will stick, but not cause casimir. Also, someone i shouldnt mention for some reason combined casimir with hubble's constant and fixed dark matter and furthered the understanding

[@june171932]

I have been thinking about mass for a while in conjunction with vacuum fluctuations. I hope you may know the Casimir effect. If we consider the Casimir effect, notice that if there is a force it must be capable of doing work. Thus there is energy in the vacuum.? Now if we think of that force and the energy we notice that it is a consequence of decreasing the fluctuations in a region of space. Thus anything that occupies space has the same effect. Since E equals MC squared, we could identify this effect as associated with the mass of the object that is occupying the space. Have I discovered that the rest mass of an object is due to the space of the object that now has a reduced region of vacuum fluctuations.

[@truthbetold444]

If you are saying that the rest mass of an object is equal to the energy of the quantum fluctuations that it displaces, then you are right.

[@lucasoesterreich]

Great lecture, made even more great by the fact that Dr. Milonni used a hockey stick to teach Quantum Physics. O Canada.

[@louisscott471]

43:30 I get \frac{\pi^{2} h c}{720 d^3} with 720=8*90 and an extra d from V(d) = -Ad [ ...] Any one show me the way?

[@rdbom4252]

Typo on the slide. He meant to write F(d)=-V'(d)/A. (Note the derivative on the V. Force is the negative gradient of energy.) That removes a factor of d and gives the missing factor of -3.

[@berniebrickbuilds]

Could the Casimir effect be the same as gravity? I mean could the force of the earth being pulled to the sun actually be the force of wavelengths larger than 98 million miles pushing the earth towards the sun?

[@lupat9955]

maybe if the earth was placed closer to the sun, it wld dive in? just wonder if the equilibrium gravitationnal state is so strong but may also be very fragile in the sense that it could also be disturbed and create non-equilibrium conditions

[@Dr.HazharGhaderi]

Great lecture.

[@broark88]

Does anyone know the relationship between aspect ratio of a nanoscopic cylindrical cavity and where the casimir forces become attractive or repulsive? I watched this whole presentation just to get at that and then he brushed over it at the end. Lol.

[@ethanoyamawang]

Where do I find a link of ppt he use?

[@BassandoForte]

This could also explain 'dark energy' if more energy is acting on the outside of the strips pushing them in than on the inside pushing out then the universe which contains all the 'zero point' energy (I think its the actual fabric of space-time) pusing out into nothing just like water fills whatever is holding it.

[@taylorwestmore4664]

Sorry for necroposting, but around 5 years ago when you commented Harvard actually did the math incorporating the negative energy and positive energy contributions of gas clouds around Galaxies and found that significant amounts of 'gravity and anti-gravity fields' could exist due to Cosmic scale vacuum energy fluctuations. Dark matter and dark energy are probably 'vacuum energy gradients' above or below the ground state.

[@robertkokal2511]

You got it. Zero point energy is dark energy and. 70% of universe is dark energy. So much power

[@andrewbodor4891]

Has anyone done experiments with the Casimir effect at the ISS?

[@Kaeralho]

@prophetofthenow how so? what plates?

[@BassandoForte]

The energy thats being produced and repaid if accordance with Heisenberg uncertainty relations is the fabric of space-time.

[@ThisIsSolution]

guy in front row is holding his head from exploding 54:40

[@SeanMauer]

So how do we know this is not just a repeat of the Cavendish experiment?

[@noahpierau]

Because the Casimir force experiments were conducted on two ' plates' without any charge (in a vacuum field and at a low tempreature). I do not study physics but this is what I understood ;)

[@SeanMauer]

no0t This really does not distinguish it from Cavendish.

[@tomasfernandez9045]

SeanMauer For what i understand, the Casimir effect is done with 2 very thin plates, so that the mass of this 2 plates is very very small. The Cavendish experiment used 2 very massive objects.

[@SeanMauer]

***** This I know, but if the mass-over-force ratio was the same for both experiments (and I don't know this) then how can you distinguish the forces?

[@tomasfernandez9045]

SeanMauer The 2 forces have diferent formulas, so they are diferent.

[@slipperytoes89]

so if this "casimir effect " could produce energy how could you harness it ?

[@vinitchauhan973]

Adam Gregan you really cant it's fluctuations in 0 point energy or if you will, quantum fluctuations, this means that the energy is there for momentarily and then it conserves itself.

[@antikertech157]

You will not find the positive answer in materialistic science. You have to study the spiritual laws of the universe. I leave it up to you to ignore or consider this possibility.

[@yudk8418]

@@antikertech157 I have no Knowledge of this topic but was drawn to it bc my grandads name is Casimier… there are some unexplainable occurrences that ppl experience for which they try to find some materialistic explanation either for sanity’s sake or in an attempt to duplicate the experience or both …well Im not sure if certain wonders are allowed to be explained or duplicated .. it has its own intelligence

[@ryanhegseth8720]

Cavendish did not do an experiment. Balls in a shed is not an experiment. What’s the dependent variable? What’s the independent variable?

[@manipulativer]

If i understand the math correctly you should be able to spin cationic plasma at relativistics speeds inside a metal enclousure and use electric charges and magnetism as propulsion with zero inertia against movement.

[@joshuawhitaker7527]

Because hadrons make the field leptonic mass interactions occur in.. the very flow causes an induction event.

[@joshuawhitaker7527]

Yet electron velocity to mass ratio keeps it all going via their relationship to protons in alpha potential by space. Where as the closer the relation the higher the speed.

[@joshuawhitaker7527]

Strong force isn't it.. lol

[@robertkokal2511]

Very interesting

[@MattBurton1987]

You'd have to be immensely nerdy to chuckle at the joke he made about the books expanding at the rate of a logarithmic scale lollll

[@AronAroniteOnlineTV]

Most impressive and looks every bit like Woody Allen.

[@davidwilkie9551]

Comprehensive

[@Dr.HazharGhaderi]

@MattBurton1987 "but there's no violation of relativity because no information is being transmitted" lol (laughed out low).

[@dragon72tube]

Nicolas Tesla use vacuum energy in his experience. John Bedini is using it in his energizer machine.

[@prophetofthenow]

casimir effect maybe the very reason of what happens at the bermuda triangle, two plates causing a casimir effect

[@OJeyjunior]

pliz stop, I'm already dead

[@TheInboil]

that hockey stick pointing obsession is so distracting

[@dickstephenson]

+TheInboil Lol, he's even got a spare.

[@oliver2770]

I'm sure the naysayers love this.

[@physivic]

@MattBurton1987 If laughing at that is not cool, then you can just go ahead and not call me Miles Davis

[@JJ-qc6lh]

i wish i could understand this! ...I WILL ONE DAY!!!!

[@TravelerPro]

Not a natural communicator for such fascinating material. He sounds about as enthusiastic as someone doing the laundry, not as someone who has truly comprehended a miracle of nature. Boo!

[@Synkooh]

i am so not smart enough to have watched this whole video

[@gruminatorII]

meh dyne/cm^2 ??? now physics teachers start to use shit units too ?

[@Anon54387]

+Philippe durrer Still a unit of pressure. Why the semantics? One could use kilowatts to say how much power an internal combustion engine produces, or horsepower to say how much power a radio transmitter emits.

[@jacobvandijk6525]

@ 2:21 Mr Milonni isn't very well informed about what's published in the physics-community. 7 Years before this video was uploaded (in 2005) Mr Jaffe (from MIT) showed that the Casimir-effect can be FULLY EXPLAINED by classical physics. Bye Mr Milonni.

[@samdan8291]

Oh were to start. Lies, more lies and he did not give consent. I studied under Doctor E.r Frederick and I can tell you this is not ok to use without written consent

[@tonyscott1658]

FYI That's Richard Feynman NOT Richard Fineman!