Quantum Theory

Hello everyone (a formality for my first post only) So, I built two objects out of neodymium magnets and ball bearings, and then hung one from the bottom of the other. When I spin the bottom object it remains spinning for an impressive amount of time, but it does stop. It's momentum appears to be sustained (it seems to spin longer than the mechanical force applied would provide momentum for) by the force of alternating magnetic fields as they (the magnets on both top and bottom objects) pass by oneanother. My question is simple. Would it keep spinning forever in the vacuum of space or under some set of unknown (to me) circumstances. I'm not a scientist, just a cu…

Hello, I'm currently part way through my physics degree, and I'm researching the De Broglie-Bohm pilot wave theory. So far, I understand the basic premise of the theory as follows. All atomic particles, for example electrons, possess a real position and velocity. The wavefunction also exists in the form of a ‘matter wave’ which acts to guide the motion of the particles in such a way that their statistical properties are exactly as predicted by quantum mechanics. I understand that this it is a 'hidden variable' theory, and as such the underlying deterministic sub-structure is 'hidden', but I was wondering if anyone could help expand on a descriptive definition of …

Well i dont want to end up like that errrm well 'anus' who tried to advertise a site on here, but i think this may genuinley be of interest. Plz feel free to move this into another Topic area, as im not sure it should be here. http://physics.about.com/cs/opticsexperiments/a/290903.htm

Would an object still be able to emit and/or absorb gravitons at absolute zero? Or... Would an object have the same gravitational attraction at 0 degrees Kelvin as it does at 3 degrees Kelvin?

Hi, I've been interested in quantum computing for a while now and I've always wondered, why can't light be used to preform computations? So I've been working on ways of encoding information into beams of light and I've got a few ideas so far. 1. using the spectrum from beams of varying wavelenght and frequency. I haven't been able to check this idea to make sure it would be valid, though if it is, this would be easier to store but would take longer to encode for processing. 2. using the seven colors of the rainbow and white to represent information. This, too would be easy to store and wouldn't take as long to decode . 3. using light of varying frequencies to repre…

Can you please leaves titles of books in here I would like to read some new ones, and I think it would also help other Quantum Theory begginers to the advanced. I think the best structure would be. Title: Author: Description: Rating: Can't wait for your suggestions. Thank You.

Please consider lending your approval and assistance to the Fahrenhalf temperature scale this is the scale on which the hottest temperature known to sentient beings, Planck temperature, is 1032 degrees. An easier way to think of it, however, is that one Fahrenhalf degree is one half of an ordinary Fahrenheit degree. On the usual Fahrenheit scale there are 180 degrees between freezing and boiling, so there are 360 degrees Fahrenhalf between freezing and boiling. I would recommend taking freezing as a point of departure so that freezing is 0 degrees and boiling is 360 degrees You can figure out room temperature, or human body temperature, if you care …

I don't know if anyone in this forum reads New Scientist, but this weeks issue had a very interesting acticle; about gravity fluctuation. It explained how a pendulum act eratically during and solar eclipse, first observed by french physicist Allais this activity seems to flaw Einstein's relitivity laws. This behavior during eclipses have been noticed many times during different experiments, also during eclispes gravity has been noted to drop largely. Obviously this development is in it's first stages, but I would like to ask other people's veiw on gravity fluctuation and any links that would be of interest, as Allais papers are mostly in french, and that's not my …

Can anyone explain in layman's terms what the Planck's constant is? I'm not an utter novice on quantum physics but the wikipedia article on Planck's is way too professional for me.

I don't know if anyone has read about that astronomers have discover dual images of both galaxies and a quaser. This means that the light had to have taken two directions, something a superstring might do. I can't actually find a very good link this is the best I can get because New Scienctist's article has to be payed for: http://www.newscientist.com/article.ns?id=mg18424781.400 Any other links will be of good use

if you run the double-slit experiment for a little while then put additional detectors in the beam of electrons/photons/whatever to where the particles are detected and can still pass through the slits, what kind of pattern is the result? is it interference, or particle?

In another thread, about something else (dynamical triangulations approach to quantizing Gen Rel) Severian pointed to this new posting as "a more interesting paper about gravity" "Lagrangian formalism of gravity in the Randall-Sundrum model" http://www.arxiv.org/abs/hep-ph/0412109 Could be worth checking out. Anyone have comments? Want to say why it could be of special interest?

Exactly like I have stated can a Heisman's principle ever be overuled, be technology be created to account for HUP that can actually give measurements for the position and velocity of objects.

today a Cambridge postdoc Daniele Oriti posted a paper http://arxiv.org/gr-qc/0412035 which links his line of research, the Spin Foams approach to quantum gravity, to the approach called Dynamical Triangulations there is evidently a convergence of non-string QG theories underway: DT, SpinFoam, Loop QG, Hawking path integral. oriti's paper is called The Feynman propagator for quantum gravity: spin foams, proper time, orientation, causality and timeless-ordering Oriti got his PhD in Quantum Gravity from Cambridge----i saw his thesis last year. It is interesting that he is still at Cambridge As I recall he was working with R. Williams who is an exper…

I think the most visual approach to Quantum Gravity is the one called dynamical triangulations the specific type being most worked on is called CDT (causal dynamical triangulations) where the researchers can simulate in a computer the evolution of the geometry of the universe----they do randomized runs so as to explore the idea of a typical geometry or history. Every geometry is specified by a triangulation, so you have to have a way for one triangulation to change into the next one and this happens by what they call, in their model, Monte Carlo moves these are local changes in the triangulation and the way the computer simulation works is that at some moment…

I am writing a philosophy paper about the essence of the universe and the possibility of multiple universes, I need some help with QM. I do not know any of the maths behind Quantum Mechanics or the physics but I sorta understand the "ideas" it proposes, can someone with more knowledge help me out ? Here is a paragraph from my paper and I feel it is flawed but I do not know how to explain it better, remember this is for philosophy. If I messed it up and offended Quantum Mechanics don't hate me, teach me.

Can anyone explain to me how quantum computers work?

I seem to be talking about vacuums constantly, but when facing another problem I hit this. In order to stop a box holding a vacuum collasping inwards you could freeze the box to stop particle activity. My point is what is the temperture inside the box (which is the vacuum) because you need particles to have a temperture however if there are no particle is there no temperture, which I find very hard to imagine.

I understand that virtual particles and anti-particles are made and destroyed resulting in what some might call a vacuum not being one. Can a physicist happen this a bit more in depth, please.

Newtonian mechanics are perfectly applicable in relativistic and quantum worlds. The only problems are that the quantities with which we define the state of matter constantly change as speed increases. This however in no way undermines Newtonian Mechanics - at every instant they work just fine, its just the quantities that have changed. In the microscopic scale the only problem arises from the fact, that with Newtonian mechanics we are defining an arbitrary geometric shape from the continous universe and assigning it with strict quantities. This doesn't work in the microscopic world however as objects are not defined enough to be forced into strict geometric shape…

Hello, my account became inactive, so I made a new one, I do not have multiple accounts. Okay, to cut to the chase, I heard about how if you recorded information about a particles position, then the particle would act according to classical physics. I also heard if you deleted the information, then the experiment would change, even after it had occured. So I was thinking, that this could be made into a form of communication, supposing that it would change automatically once the information is deleted regardless of distance. Does it change it immediately after, or is it delayed? because if it changes it immediately after, then you could have large sums of inform…

Dear Friends, HUP says that dx*dp>=h.Is it also true from frame of refrence of electron, at that time I know position and Momemtum of electron ?

I reckon we have to use quantum mechanics to explain why glass can transmit visible light through but not objects like ceramics and metals. In addition, why is glass able to block off or reflect totally certain cutoff wavelength of radiation in the infrared range? We know that because this is the mechanism of Greenhouse Effect. In addition, I know that when light propagates and is incident on a material, 3 things can happen. Certain range of wavelength of light is absorbed and other ranges of light is reflected, which is the basis of the theory of colors. Lastly, light can also be transmitted right through the material if the material is transparent to this range of w…

Somebody just threw an equation at me and called it something like Planck's equation for energy in a vacuum: E=(1/2+n)h_bar w. Where n is the number of photons and w is the frequency, should be nu. Anybody heard of such a thing or is it pure BS? I know Planck's equation: E=hv But I never seen this stuff.

Is it there if no one is looking? after all, probability waves aren't collapsed until one observes the particle. the moon is just a collection of particles, so is it there if no one observes it? on a side note, what is the probability that the moon could suddenly dissapear to the other side of the andromeda galaxy? i suspect it is so close to zero that it is almost infinitely small.