Quantum Theory

The more we learn about QM the more time seems to be Obsolete. I was wondering though, we have this problem of entropy. Is there, an explanation of entropy that does not involve time? Any ideas?

We competed to see who would predict some stuff right one of these links should get post #104, with the details http://www.scienceforums.net/forums/showthread.php?p=184692#post184692 http://www.scienceforums.net/forums/showpost.php?p=184692&postcount=104 Some of the results needed to decide who guessed right are not in yet. But some are. Yourda did pretty well. So did someone with the strange name of MISTER NINE. Yourda guessed there would be 8 articles about CDT quantum gravity posted in 2005, and there were. Actually the search came up with nine articles (Mr. 9's guess) but the one by Smolin was only partly about CDT----it was more of a gen…

I was thinking about string theory the other day, and I thought that some of the details of string theory have implications for quantum physics. In particular, I was wondering if the vibration of strings can account for the "unstable" nature of states that particles can be in. For example, could something like spin change its value depending on exactly what state the vibration of a string was in? I don't really know the relation between spin and string vibrations, but I suspect that vibrations, being so variable as they are, must have variable effects on our measurements of particle states. Also, some string theorists believe that strings can vibrate in up to 10 or 11…

Tell me if I am right but neutrino were invented to account for some energy that does showup in nuclear fusion: conting the mass and energy before the fusion and the mass and energy after, there was a discrepancy. So the neutrino was born. Neutrino carry energy. Does neutrino have momentum ? Does netrino have spin ? I know they don't have electric charge and I suppose that they don't have magnetic charge because they would interact with matter. There is some evidence that they have mass. So they must have momentum ... If they have mass they are not moving at the speed of light. Also the detectors all around the world detect a so small number of events out of fa…

I was reading a magazine that mentioned an elementary particle called a Kaon which had the property to be able to change into it's own anti-particle and back again. This same magazine also had a table of all the elementary particles and the Kaon wasn't listed on it. So what's the story with the Kaon - apart from it having a REALLY cool name?

Okay, this may sound weird, but here is a very basic question... Why is energy considered 'another' entity than matter when its dictionary meaning is simply "the capacity of matter to do work"? It seems to be just a property of matter. Moreover, we cannot experience energy through our senses in any form, we can only experience its effect on matter. We do not see light energy but only the object that reflect the light entering our eyes. We do not hear sound energy but only the vibrating effect produced by it. Also we never experience heat energy but only heat. Energy in no way interacts with our senses directly but is still considered something other than matter. I rea…

So we know that quantum mechanics is a non-deterministic field. Something I've always wondered though is how to interpret "non-deterministic" in this description. Does it mean the phenomena in the quantum world are completely random or is there is there more of a fine grained level of probability? What is mean is - suppose you wanted to measure the position of a particle. Would you expect your results to be completely random (as is the particle could be anywhere) or somehwhat probablistic (as in the particle is most like to be in a particular region)?

With the Rydberg equation we can calculate spectrum line of hydrogen. Is there a simple equation like that for Helium and other elements ? Does the Rydberg equation cover all hydrogene spectrum line ? Thanks

What are the main flaws of the Bohr atom? does anyone know a good website that would explain them???? thanx

Hey, I've got this problem from Peskin & Schroeder (chapter 15). I'm not particularly confident with functional integration, as I'm pretty new to it, and working through such a book by myself is pretty tricky in places. Well here goes The Wilson Loop for QED is defined as [math]U_p(z, z)=\exp \left[-ie\oint_pdx^{\mu}A_{\mu}\right][/math] With the Wilson line defined similarly (just change it so that there's not a closed contour integral and with the end points (z,z) changed to (z, y), or whatever you like). Where A is the photon field, the gauge connection asociated with transformations in U(1). Now it says: using functional integration, show that …

1.Why do jewelers often examine diamonds in day light rather than with indoor light ? 2. Explain why the existence of cutoff frequency in the photoelectric effect more strongly favors a particle theory than a wave theory of light? 3. Darkroom for developing black and white film are sometimes lit by red bulb ? Why red? 4. If an xray photon is scattered by an electron, does its wavelength change? if so, does it increase or decrease? 5. In both …

I was interested in reading Schrodinger's Cat but the bookstores do not have it. One however had Schrodinger's Kittens. It is a sequel but do you need to read cat first? I may just order it on amazon or something.

Time Is What We Measure With Clocks With clocks we measure duration of movement of material bodies and particles into cosmic space. In every physical formula symbol t indicates the duration of the movement. Time is movement, movement is time; two words that describe the same physical phenomena. The speculation that time run in cosmic space by itself has no experimental evidence, it is pure preposition that should be abandoned. In The Theory of Relativity time is considered as a fourth dimension X4 of cosmic space. This understanding of time is not exact. X4 = i x c x t -i is a imaginary number -c is a speed of light -t is number that indicates duration of…

since there are 3 types of neutrino, Tau, Muon and Electron and any neutrino can be in any of these "States" at any time. does the same apply to Anti-Neutrinos also?

http://www.nytimes.com/2005/12/27/science/27eins.html?pagewanted=1&incamp=article_popular

I read about Richard Feynman's theory of sum over path in a book early this year, but I still don't exactly understand it - just how does he assign numbers to each different path an object could take and cancel out all but one path?

is QFT part of standard QM? can someone give me a nonmathematical overview of QFT? here's my current understanding(it is probably completly wrong): there are various quantum fields. when there is an excitement in only the EM field, we get photons. if there is an excitement in only the higgs field, we get chargeless massive "particles." if there is a coupled excitement in the EM and higgs fields, we get massive charged "particles." the higgs field is coupled with the gravitational field such that an excitement in the higgs field caused an excitement in the gravitational field(gravitons). am i anywhere close on any of that?

Can someone explain to me what infinit regression is?

I searched and found this thread http://www.scienceforums.net/forums/showthread.php?t=15918 somewhat helpful, but there is a lot I don't understand so I have a few questions: Schrodinger's cat: I've read about this in wikipedia and looked at the Copenhagen interpretation as well as the Everett many-worlds interpretation, and there is some stuff I am having trouble clearing up. I think I may have read too many sources with "journalistic interpretation" throwing things off. First, in the Copenhagen interpretation, the term "observer" is not nearly defined well enough for me. I believe the principle is that when you deal with anything Really Really Small the on…

Holy shit, the two physicists I have the most respect for in the world, Steven Weinberg (who is intricately tied into the whole Dennett/Dawkins atheist memeplex) and Ed Witten (all my knowledge of which comes from Brian Greene, but I know him as the Einsteinesque genius behind M-theory) collaborated to create a theorem. But lo and behold, as I read about it, it flew right in the face of my beliefs in spiritual evolution, namely that all the complexity of the universe is emergent from a system with extremely simple underlying rules. Sadly, when I look at something like: [math]q\delta^3(\vec{p'}-\vec{p})=\langle p'|Q|p\rangle = \int d^3x\, \langle p'|J^0(\vec{x},…

I happened to overhear two people talking. Theirs seemed to be a debate over instantaneous communication using the Quantuum universe. I'm not sure of the details (way over my head), but it did sound intriguing. Much later I was surprised to see Tony Daniel in his book Superluminal suggest the same thing. Although I did not follow the vauge explanation Mr. Daniel gave, once again it sounded intruiging. (I'm not sure if I failed to follow Mr. Daniel or he simply wasn't very clear.) In a vauge sort of way I follow Heisenberg. But I'm not sure how it went from his statement to the old Sci-Fi standard of the Heisenberg Drive. However, assuming it's base is in science, it mig…

I've been searching around for the closest anyone's gotten to absolute zero... I can't find it now (forget what I searched for lol) but there was one dated 2003 that said 500 picoKelvins... I just want to know exactly how close to absolute zero anyone has been able to reach...

I`ve been thinking alot about gravity lately as a result of considering the forces at work in my generator when the output is shorted making the armature harder to turn. I hypothesize that a material under extreme acceleration would become electricaly charged or Polarised, where the leading edge of this projectile would be Negatively charged compared to the trailing edge that would become more positively charged, and were it possible to have a volt meter across the 2 ends (a meter that would somehow remain unaffected) it would show this charge. I predict that the material would also become slightly magnetic too as the domains would allign. my reasoning is that of…

Will someone please explain to me what a wormhole is, how they work, where they can go to, and how big they are. Also, please give me any basic facts that an 11 year old kid can understand. Thanks. -Herpguy

http://www.guardian.co.uk/science/story/0,3605,1627424,00.html It seems too good to be true: a new source of near-limitless power that costs virtually nothing, uses tiny amounts of water as its fuel and produces next to no waste. If that does not sound radical enough, how about this: the principle behind the source turns modern physics on its head. Randell Mills, a Harvard University medic who also studied electrical engineering at Massachusetts Institute of Technology, claims to have built a prototype power source that generates up to 1,000 times more heat than conventional fuel. Independent scientists claim to have verified the experiments and Dr Mills says that…