OT: The Gods of the EEE. - Page 2

Gryphin · #11 November 21st, 2002, 03:06 PM

Imperator Fyron ,
Probably when the cost exceeded any other source of revenue. In life as in Physics, "There Ain't no Free Lunches".
you can still get free images at www.corbis.com which is owned by Micro$ponge.

[ November 21, 2002, 13:11: Message edited by: Gryphin ]

mlmbd · #12 November 21st, 2002, 04:44 PM

rags, I WILL GET YOU!!

Fyron, maybe the cat wants to buy New imaging software. At least some of the site is still free. And out of the goodness of your heart, you can still u/l your images. On second thought it could Greed!!

Gryphin, in all of my time in Physics I have never heard that!

There goes that doctoral thesis. Thesis; How lunch effects the dynamics on a quantum field, in respect to (but not limited to) Light Front Dynamics and Light Front QCD (Quantum Chromo Dynamics)'s. Ofcourse the entire thesis is based of the fact, or so I thought, that lunches are FREE!!

mlmbd

Kamog · #13 November 22nd, 2002, 10:12 AM

Well, of course lunches affect quantum fields. Lunches are composed of atoms, which are made up of subatomic particles, which have electromagnetic / gravitational / strong / weak force fields that can act on other particles. All right, suppose you have a system composed of N subatomic particles. Inherent to that system will be a certain set of dynamic quantum fields that have particular probability density functions. Now introduce an outside influence - a lunch - and the quantum fields of the lunch particles will interact with those of the system.

Let's look at the electromagnetic forces as an example. Lunches are more or less balanced electrically, meaning that the number of positively charged particles composing the lunch is roughly equal to the number of negatively charged particles. Of course, it is unlikely for a macroscopic object such as a lunch to be exactly neutral, so there will be slight positive or negative charge. Anyway, we all know that like charges repel each other and opposite charges attract. Each of the protons in the lunch atoms will repel the protons in the system, and each of the electrons in the lunch atoms will repel the electrons in the system. Simultaneously, each of the lunch protons are attracted to each of the electrons in the system, and vice versa. The resultant force on the lunch, and the opposite (equal magnitude) reaction force on the system is a superposition of all the component forces made of up each possible particle-pair.

This is where Light Front Dynamics come in. The forces are not instantaneously transmitted from one particle to another, but the information has a speed of c. Therefore, when the lunch is introduced to the system, multiple propagating wave fronts are generated, in which the influence from the lunch particles travel as a waves to the particles in the system. In the case of electromagnetic forces, electromagnetic waves are generated, of course, and therefore in certain frequency ranges we get light front dynamics.

As for quantum chromo dynamics, it depends on the relative motion and speed of the lunch with respect to the system, and how that causes a change in frequency of the wave. ('chromo' refers to color, which is a function of the frequency.) Of course, when we say the lunch is free, we don't mean that you didn't pay money to get it, it means that you can't produce it out of nothing - well, there is a very tiny but nonzero chance that a lunch will appear out of vacuum, but for all intents and purposes, we can say that it never happens.

[ November 22, 2002, 08:18: Message edited by: Kamog ]

mlmbd · #14 November 24th, 2002, 06:50 AM

Kamog, yes exactly. Wait a minute. How is it that you know so much about what is in my doctoral thesis? You or anyone you know been around Irving, TX, lately?

Hmmm!!!

mlmbd

Kamog · #15 November 26th, 2002, 08:12 AM

No, I have not been around Irving. A couple of months ago I read in the news that some physicists at Caltech have succeeded in teleporting a light beam across a room, so I started reading up on it to try to understand how they did it. I read a bunch of stuff about Alice and Bob, squeezed light, quantum states, entangled photons, and so on, which was fascinating, but sadly, I must admit that it is over my head and I still don't comprehend it.

I haven't given up yet, though, I figure that if I keep learning about quantum mechanics I'd eventually figure it out.

Wow, mlmbd

,you're working on a doctoral thesis in quantum mechanics! Can you explain what is squeezed light and how does entanglement work?

mlmbd · #16 November 27th, 2002, 09:07 AM

Kamog, Quantum mechanics holds that a beam of light, even laser light, exhibits small energy irregularities (shot noise) owing to the effects of vacuum fluctuations (electromagnetic fields in the vacuum whose omnipresence is sanctioned by Heisenberg's uncertainty principle). Over the past ten years physicists have been able partially to overcome this problem by reducing the noise in either the phase or the amplitude of the light at the expense of the other. The resultant "squeezed light." Does that cover it? I can give you a summary of Heisenberg's uncertainty principle. If you need.
As to how entanglement work? I am assuming you are referring to "Quantum Entanglement." Yes?
Quantum entanglement is a physical resource, like energy, associated with the peculiar nonclassical correlations that are possible between separated quantum systems. Entanglement can be measured, transformed, and purified. OK?

Kamog, phyisist are confused by physic. More particularly Quantum Mechanics. So, don't be discouraged. As you stated,

Quote:

"I figure that if I keep learning about quantum mechanics I'd eventually figure it out."

Just keep learning!

Hope that helped, a little.

mlmbd

Kamog · #17 November 27th, 2002, 09:22 AM

Thanks for the explaination! Yes, that helps.

I only took a third-year quantum mechanics course in university, and mostly what we did in that course was to study electrons trapped in different kinds of quantum wells, solving the Schrodinger equation for these simple cases and for the hydrogen atom. We also learned about the Heisenberg uncertainty principle, de Broglie wavelengths, wave-particle duality, the energy of photons, tunneling and so on. But we didn't learn anything about quantum entanglement or quantum teleportation!

mlmbd · #18 November 27th, 2002, 09:34 AM

I am glad to hear, it helped!

mlmbd

capnq · #19 November 27th, 2002, 11:42 PM

I've seen bumper stickers that say, "Heisenberg may have slept here."

mlmbd · #20 November 28th, 2002, 05:28 PM

capnq, I've seen those, too. Your post reminded me of, the first time I did. I was at Berkley, in a parking lot. I did find myself smiling with the thought of Heisenberg blanching precariously on that bumper. Anyway as I got closer to this car, I could see there was other writing on the bumper sticker. I got to the car, it read; " so did Copernicus, Euclid, Pascal and that other FAMOUS mathematician guy, AH Einstein!". I almost hurt myself LOL. That laughter was soon modified when the owner of the car exited the book shop. Complete with pocket protector, a small slide ruler in it, and a copy of Einstein's "Collected Papers of Albert Einstein Vol 2". I had to find a toilet. Before I embarrassed myself, by urinating right where I stood. I still chuckle, anytime I am reminded of that!

mlmbd