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#1 2007-02-27 01:17:29

kristi_jan
New Member
Registered: 2007-02-27
Posts: 4

anti-gravity my ideas need help

I've posted on discovery - http://community.discovery.com/eve/foru … 5081963168 , right now the posts are on the 3rd page. There is a good interes. I need some informations on Cherenkov radiation - is there any changes in the voltage (electrical resistance) in the Cherenkov effect. On internet can't be found any informatiopns on this topic - if someone knows a link or info please reply.

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#2 2007-02-27 04:26:03

Chris
Assistant Professor
From: Longwood University
Registered: 2004-09-30
Posts: 747
Website

Re: anti-gravity my ideas need help

I don't quite understand your question. First, there is a big difference between voltage and resistance. Second, are there changes in the voltage of what, exactly? You only get Cherenkov radiation in electrically insulating materials.

Cherenkov radiation is when you get a particle (like an electron) to move faster than the speed of light in a certain material. Note that the speed of light is constant in vacuum, but varies when propagating through a material.

As a charged particle travels, it disrupts the local electromagnetic field in its medium. Sort of like how a skipped stone will leave waves in the water. Electrons in the atoms of the medium will be displaced by the passing EM field "ripple". Photons are emitted as the electrons restore themselves to equilibrium after the ripple has passed. These photons are radiation.

In normal circumstances, these photons destructively interfere with each other and no radiation is detected. However, when the disruption travels faster than the photons themselves travel, the photons constructively interfere resulting in radiation. This is what is called Cherenkov Radiation. It is analogous to the sonic boom created when an aircraft passes the sound barrier.

I have no idea how this relates to "anti-gravity".


Chemists are physicists who don't do math. smile

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#3 2007-02-27 12:32:58

kristi_jan
New Member
Registered: 2007-02-27
Posts: 4

Re: anti-gravity my ideas need help

Well I meant Cherenkov radiation is produced from relativistic electrons movung in a medium, if they are moving in the medium than there is a electrical current, if there is an electrical current than there is an electrical voltage and electrical resistance. I need the info on voltage and electrical resistance changes in this electrical current when the Cherenkov effect is produced. By my theory (you can find it at - http://community.discovery.com/eve/foru … 5081963168 - now post at the 3 rd page) there should be a voltage peak when the Cherenkov effect is produced and electrical resistance should drop. What is the correlation with Cherenkov light and anty-gravity you can read at this link. Here is one link what I think is saying about voltage peaks in cherenkov effect - http://adsabs.harvard.edu/abs/1999PhRvB..6012419I.

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#4 2007-02-27 12:42:35

kristi_jan
New Member
Registered: 2007-02-27
Posts: 4

Re: anti-gravity my ideas need help

Also one thing wery interasting that I would like you to comment - the compare Cherenkov radiation with the airplain bracking the sound bariere, but in this situation the wave is behind the plane, in Cherenkov light the wave is in front of the electron? How can that be? I have also explanation on this link

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#5 2007-02-27 17:33:57

Chris
Assistant Professor
From: Longwood University
Registered: 2004-09-30
Posts: 747
Website

Re: anti-gravity my ideas need help

Well I meant Cherenkov radiation is produced from relativistic electrons movung in a medium

Not exactly. In fact, in photonic crystals Cherenkov radiation can occur at just about any particle speed. Keep in mind that the speed of light in a medium will be dramatically lower than in vacuum. For example, in glass the speed of light is about 3/4 the value in vacuum. The electron does not need to be "relativistic" at all.

Also, to produce Cherenkov radiation, the particle must move faster than the phase velocity, not the group velocity. Even in vacuum, the phase velocity can exceed the group velocity (speed of light) without any strange (extra-relativistic) effects.

f they are moving in the medium than there is a electrical current, if there is an electrical current than there is an electrical voltage and electrical resistance

One electron moving through a medium is not the same thing as a current. Keep in mind, that Cherenkov radiation only occurs in nuclear reactors and via high-energy cosmic rays. It takes some big external bang to get the particle moving fast enough through the medium; there is no electrical potential large enough to move an electron fast enough through a dielectric material.


Chemists are physicists who don't do math. smile

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#6 2007-02-27 18:04:51

Chris
Assistant Professor
From: Longwood University
Registered: 2004-09-30
Posts: 747
Website

Re: anti-gravity my ideas need help

Concerning the article you refer to:

First, have you read the full article? I ask because a subscription to Physical Review B is expensive.

Second, the authors are not talking about Cherenkov radiation in the same context. (I have read the full article.) In their context, no particles are really moving at all, only a vortex. And if and only if that vortex exceeds the speed of sound (less than 350 m/s) in the superconductor will sound radiation (just like a sonic boom) be produced. You cannot produce Cherenkov light radiation in a superconductor. In fact, you cannot produce it in a simple metal.

If the electrical resistance dropped in a dielectric material such that you had a "voltage peak" as you describe, then you eliminate the actual physical mechanism by which Cherenkov radiation occurs. That is to say that your scenario is both physically and logically impossible.

compare Cherenkov radiation with the airplain bracking the sound bariere, but in this situation the wave is behind the plane, in Cherenkov light the wave is in front of the electron? How can that be?

Huh? Sound waves generated by a supersonic body do not move fast enough to get out of the way of the body itself, so the waves "stack up" and form a shock front, which is in front of the body itself. The same happens during a Cherenkov event, however in this case the wave is an electromagnetic field "ripple" as I discussed above. The actual light emission would occur after the electron passed.

Your statement is technically wrong for both supersonic bodies and Cherenkov radiation.


Chemists are physicists who don't do math. smile

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#7 2007-02-27 18:08:31

Chris
Assistant Professor
From: Longwood University
Registered: 2004-09-30
Posts: 747
Website

Re: anti-gravity my ideas need help

Finally! A condensed matter discussion.

Now maybe I can teach Ben something. smile


Chemists are physicists who don't do math. smile

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#8 2007-02-28 17:47:52

kristi_jan
New Member
Registered: 2007-02-27
Posts: 4

Re: anti-gravity my ideas need help

Wwll there may still be a way to test if electrons that create teh CHerenkov light make any changes in the electrical resistance. You can bombard one medium with high energy electrons that will produce Cherenkov light and measure the voltage and than do the same with electrons with energy just below the energy needet for Cherenkov light. This way you can see if this electron are making some tipe of resistance changes. In my theory this electrons have losed their mass (weight) and so they travel easyer thrue the medium reducing the electrical resistance. I would realy apreciate if you visit the aboule link to a discovery channel where I have this posts (pasting it here may take to much space - there are 3 pages) and explain to me why all of it is ridiciluos and to stop to belive in it.

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#9 2007-02-28 18:45:26

Chris
Assistant Professor
From: Longwood University
Registered: 2004-09-30
Posts: 747
Website

Re: anti-gravity my ideas need help

Wwll there may still be a way to test if electrons that create teh CHerenkov light make any changes in the electrical resistance.

That's the point. That there is a large electrical resistance (insulating) is the reason you even get Cherenkov radiation. You can bombard a metal with high-energy electrons all day long and never see Cherenkov radiation.

In my theory this electrons have losed their mass (weight) and so they travel easyer thrue the medium reducing the electrical resistance.

First, what is the mechanism by which these electrons would loose mass? Mass (as in the amount of stuff, which is all gravity cares about) is an invariant property of an object, even at relativistic speeds. Second, if an electron were to loose mass, how would this affect the electrical resistance of the dielectric material?

You are confusing an energetic electron (or even a beam of such electrons) with a current. Across what two points would you measure your voltage?

I would realy apreciate if you visit the aboule link to a discovery channel where I have this posts

I have.

explain to me why all of it is ridiciluos and to stop to belive in it.

I'm not saying your thoughts on the subject are ridiculous. I just think you may have some misconceptions about what Cherenkov radiation is. You can believe what you wish, however nature will continue doing what it does.

Also, even if your experiment were feasible it would definitely not be accessible to MythBusters for a couple of reasons: (1) Cherenkov radiation requires VERY energetic electrons, which means nuclear reactions or cosmic rays -- so a LOT of money; and (2) two special effects guys lack the educational and technical background necessary for such experiments.


Chemists are physicists who don't do math. smile

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#10 2007-12-10 02:04:40

Nicholas
Resident Crackpot
Registered: 2007-09-17
Posts: 267

Re: anti-gravity my ideas need help

Why light slows down when passing through matter should be explained. It is true that transparent objects are not absorbing light as it should be emitted at a different angle scattering any image.

The permitivity and permeability of the electromagnetic field of the atom is what slows down light.


Matter's EM field slows light. Its not soley absorption and reemesion. This means light speed can be changed for sure.

This needs to be addressed.

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#11 2008-04-20 23:59:24

Nicholas
Resident Crackpot
Registered: 2007-09-17
Posts: 267

Re: anti-gravity my ideas need help

Anti gravity is observed at the equator. You weigh less where the Earth's rotating motion is the fastest. This is an outward centrifugal force.

Rotation is anti gravity. It cancels gravity. It's outward acceleration.

Change of motion creates Einstein's Equivalence Principle. Change of motion of a frame produces weight or gravity as Einstein said.

Mitch Raemsch

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#12 2008-04-23 18:40:54

Chris
Assistant Professor
From: Longwood University
Registered: 2004-09-30
Posts: 747
Website

Re: anti-gravity my ideas need help

Why light slows down when passing through matter should be explained.

It is explained. We typically explain it in introductory physics courses. I even cover this in introductory courses for non-physics-majors.


Chemists are physicists who don't do math. smile

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