Quantum Theory

i was trying to start a project on quantum entanglement but i cant grasp a good concept of the science can someone help.

This might belong here, or in astronomy/cosmo, but: I read of the possible radiation from event horizon limits of virtual particles, one of which is going outward and the other of which is going in. This may be seen as radiation from the outside but something is gained by the black hole, so it seems to me this cannot be seen as a mechanism for loss of BH mass/energy. What is claimed here? If we have interrupted what was a virtual process. this is serious business, but accounting should go both ways.

A mechanical failure resulted in a large helium leak around midday Friday (yesterday) in sector 34. The mechanical failure is presumed due to a bad electrical connection between two magnets. The magnets carry high current, so if a part of the circuit loses superconductivity and develops resistance, it can quickly heat and blow. CERN press release: http://press.web.cern.ch/press/PressReleases/Releases2008/PR09.08E.html The repair is expected to be quick (a few days at most.) What will take time, and will cause at least a two month delay, is that sector 34 will have to be warmed up first (to permit opening for repair) and then cooled down again---to restore s…

Has anybody heard of a theory about quantum preordination? I have some ideas, but I'm not entirely sure that they're new. I remember thinking about String Theory before I ever knew it was an established idea, and I want to make sure this isn't the case this time around. Actually, come to think of it, is preordination even a word? The spell check says it's not, but I never liked spell check. If it's not a word, substitute predestination.

I was wondering why the microwaves generated in a micro oven, cannot escape the metal grid that is located just behind the glass in the door of the micro oven?

Probably an odd question but when you perform a measurement do the physical variables themselves refer to one singular entity? Such as with wave particle duality? I am confused right now as I am reading up on three different interpretations at this point for hobby only. I cannot define for myself if a quantum or a quanta or the physical observables themselves are to refer to a single thing such as an electron. I mean if quantum theory is to be used to describe the physical universe, such as with the big bang and on, where do quanta come from? Are they to be viewed as single entities, or would it be safer to say that maybe because QM seems to be a fundamental aspect o…

First approximation of free electron in conductor can be a plane wave. So shouldn't there be more analogies from optics? Remember that single electron can go through two slits at the same time... Photons interact with local matter (electron/photons) which results (in first approximation) in complex coefficient (n) - refractive index. It's imaginary part describes absorption - corresponds to resistance for conductor. It's real part corresponds to phase velocity/wavelength, is there analogy in free electron behavior? Different conductors have different local structure, electron distributions etc. - so maybe they have a difference in refraction index... If yes, …

I often wondered why quantum theory has a problem integrating gravity. I would like to propose something for discussion, which is another way to look at this lack of interface. This suggestions reflects, not a problem with quantum theory, but a problem with a fundamental assumption. Correct me if I am wrong, but relativistic mass is not affected by gravity. It is a SR affect and not a GR affect. The particle data we achieve in particle accelerators is a combination of GR mass and SR mass, such that gravity can only affect the GR aspect. Does the lack of interface between quantum theory and gravity a result of the particle states created in the accelerators partially …

Charge transfer is often referred to as a problem in conjunction with DFT, Density Functional Theory. Why is it so? Consider an electron attached to a molecule with positive electron affinity. We first calculate the electron density. Then we change the positions of the nuclei a little. Then we calculate the electron density again. The electron density has probably changed somewhat. Is this redistribution of electron density referred to as "charge transfer"? And is it in any way a problem for DFT? Should TDDFT be used?

will we find the Higgs Boson to be present/absent in the upcoming LHC experiments?

Why does this occur? I looked Thermal Radiation up in Wikipedia and it said "Thermal radiation is generated when heat from the movement of charged particles within atoms is converted to electromagnetic radiation" which seems pretty vague. Is it that there is no identified mechanism for this?

Ok. Here we go; 1) What did they do with the 'old' lep, besides remove it? 1a) The questions get harder.. 2) The LHC will start (from what i have read), from energies of 5Tev's, with the projected 7-10Tevs' as "nominal". Although the LHC 'may be pushed to 12-15Tevs. The question is; Haven't most (top end), physicists said that to find the Higgs Boson particle will need 20-25Tevs? 3) Bearing in mind that some of the technologys used since the commission of the HLC were not even invented at the time: The Lead Tungstate crystals used (from Russia and China), have already been surpassed as in Light properties recently. The question is; How would this 'month …

Hey i didnt know where to put this im a junior in vt chem and im interested in science in general, where do i start obviously i have a basic understanding of stuff but i wanna learn, how do i do this.

This blog post has some detail http://cornellmath.wordpress.com/2008/09/23/no-lhc-beams-until-next-year/ section 34 is depicted as looking like an ice tunnel liquid helium can act as an explosive if it vaporizes rapidly enough helium vaporized to replace the air in a one-kilometer section of the tunnel, according to this blog post. the blogger imagines helium breathing Yeti living down there, who speak in squeaky voices

Please excuse a beginner's question. I don't see the need for superluminal or hidden varible theories to avoid what Einstein called spooky action at a distance. Couldn't the spacetime contraction in relativity theory provide the answer? Let's suppose that we could put an observer on the back of a photon. For that observer, spacetime will have contracted to zero or near-zero. The inception of that photon's life and its ending would be simultaneous or nearly so. For two entangled photons, our observer would see near-zero distance between the two and near-zero time for information to pass from one to the other. Our observer would not experience nonlocality and …

I have been struggling for some time now to reconcile quantum mechanics with radioactive decay, specifically electron capture. There is a decay process called electron capture whereby a proton captures an inner orbital electrons (does the proton "observe" the electron and collapse the wave function?) and emmits gamma or x radiation, a neutrino and an up quark becomes a down quark (and the proton becomes a neutron) thereby lowering its overall energy level. The problem is Heisenberg says we can never know the position AND the momentum of an electron (not to mention that electrons cannot lose enough energy to be captured by the nucleus--zero point energy) and the decay…

I watched "the elegant universe" and it said that quantum mechanics is based on probability calculations. So, to predict something, you calculate the probability of it happening. What experiment has been done that shows sub-atomic particles behaving this way? How did they conclude these things? Thanks for any help! This forum is awesome.

Why does X-Ray diffraction work without a coherent source ? I have an idea about the answer. Maybe the photons do not need to interact with each other. Maybe diffraction also works with a single photon which interacts with itself. However Bragg's equation is always described with multiple photons and different path lengths in the crystal... Moreover, I bthought that X-rays could be used to observed periodicities much larger than the wavelength. Is it possible that a single atom give information about such distances ? Where is the mistake ?

Thinking about photons as distinct from atomic Schroedinger solutions, is there significance to [J(J+1)] as the square of total angular momentum (AM)? We deal with photons as "spin-1" entities and this describes the transfer of a component of AM, I think in the propagation vector sense. I can see in atoms, massive systems, how there are components rendering a diffference between any chosen quantized "z-component", but is the commutative relation here between "Jz" and JTOTAL^2 relevant in photon analysis?

I have shown before my support against the Copenhagen interpretation view of the quantum world. That states at a quantum scale sub-atomic partials behave randomly. There are many experiments to show case this, one being the double slit experiment. (Watch for more details.) If photons were really random the result would not be waves or partials. It would be an interference pattern with the double slit pattern at 50% opacity. The results are conclusive and the fact that the results are constant shows that. This has lead me to http://en.wikipedia.org/wiki/Hidden_variables_theory The hidden variables theory. But why an observer changes any of this, I don't know. …

Wikipedia says that the collision of two photons can create mass. This sounds to me like a chemical reaction of sorts..

I have learned that Einstein predicted that it was possible to stimulate and excited atom with an incoming photon, and that the atom would have a high probability of emitting a similar photon having same frequency, phase and direction. (Of course, the incoming photon should match the excited state so as to facilitate an emission in the first place.) My questions are these. How the hell was Einstein able to predict that this phenomenon would occur? As I understand it, no experiment had been done prior to this prediction. Is the probability binary, such that it either emits a similar photon or none at all? Or can it emit a "random" photon, or does stimulated e…

How does No cloning theorem leads to the upper limit of velocity to the velocity of light?

Hi there, I am using Gaussian doing a calculation, which calls subroutine DGEMM to operate a matrix multiplication. And I am sure the DGEMM has been parallelized. When I ran a test job on a node with 4 processors, the speed up is very good, about 3.6 times faster compared to the speed of serial running. Then I thought if I change it to 8 processors (the limit of the node is 8 processors), it should be much faster. However, the output confused me. When I ran the job with 8 processors, the speed is about the same as running the job serially. I am really confused:confused:, does any one know how to solve this? Thank you so much.

Hi, I have a question. Apologies as I have no background in science/physics and have just started so my language may be a bit elementary. I only know what i have read. Now to the question ... I understand general relativity specifies that gravity is the curvature of space which causes the earth to orbit the sun. That makes sense in explaining the attraction of the planets. However quantum mechanics specifies that gravity is due to the exchange of virtual particles known as gravitons. So how can two sub atomic particles exchange energy that causes them to be attracted to each other? One particle releases a graviton that another absorbs. How can that ca…