Quantum Theory

I need help with making a perpetual motion machine and I will use any ideas

Hi to all who might respond,Consider the 'peculiar' double-slit setup below.There is a double-slit configuration such that the two slits are never open at the same time. That is: whenever the top slit is open for a certain interval, Ts, the bottom slit is closed for the same interval and vice versa; the configuration toggles continuously between these two states. Lets assume that we have a pulsed sub-single-photon source whose broad-band pulse coherence time, Tp, is much less than Ts. The source targets the double-slit in the following manner: it splits each pulse (which contains at most one photon) into two time bins, synchronized with the opening/closing of the slits, s…

Hi, I try to understand quantum entanglement : I understand that you have a pair of particles that are somehow linked to each other, but in unknown states, and so knowing one make the other one different (so if you measure the second you have the complementary property from the first). I'm willing to believe that it is a "quantum" special thing, but, I still don't see in what way this is different from randomly putting two cards in two envelopes. Knowing what one card is in one envelope (instantly) tells you the other one is in the other envelope. So what's so different about quantum entanglement and how could it be used for teleportation ? (please use understandabl…

I m new to quantum mechanics and read about how an observation causes the quantum object to change from wave to particle in the double slit experiment. How it's done is that whenever scientists put a measuring device to fing which path they went, they act like particles instead of waves if there are no measuring devices. It seems to show that the objects knows that they are watched. In the delayed choice experiment, the detectors are put after the slits and the quantum objects still acted like particles, which suggest that they somehow know that the detectors were there. What's really going on in here, can somebody please explain?

Discussion of quantum theory is getting in the way of discussion about chemical spectroscopy in this thread and we all agreed that it would be better conducted in a separate place. As this forum has an allocated palce for quantum theory I am starting this thread to promote that discussion. http://www.scienceforums.net/topic/109814-vibrational-frequency-co2-global-warming/?page=2&tab=comments#comment-1014291 Here is a kick off post by BBoson by way of explanation. Let's save that for other discussions I agree that quantum mechanics is quite different from classical mechanics. Like classical mechanics, QM can be approached a…

I read that an unstable particle cannot decay if one only observes it. How is this possible? https://en.m.wikipedia.org/wiki/Quantum_Zeno_effect

I am very interested in the subject of virtual particles and I have opened many threads in which you guys helped me understand related subjects. After some initial reading I came to the understanding that there is no "actual" difference between a virtual particle and a "real" one as all particles will eventually decay or be destroyed through one process or another. So lifespan of said particles was the only distinction that I came across. But "real" particles are independent and self sustaining. Different quantum fields exist and spread all through space. In any of these quantum fields there are/can be transient ripples (virtual particles). If this ripple …

My editor just asked me: who else besides Heisenberg and Bohr attended the Copenhager Convention in 1927. I always assumed it was just Heisenberg and Bohr themselves, but were there others?

An object is apparently in some sort of "suspended animation" as it crosses "empty space" and then when an "observation " is made the "waveform collapses" and its probable location is "set in stone" (this is exemplified ,it seems to me in the double slit experiment) Is it possible to say with more detail what "collapsing the waveform" actually means? Or do we just have to say "well this is what happens and that is how we describe the phenomenon with words" ? As a side thought ,is there any mileage in the idea that when any "observation" is made , we are looking at two probability waveforms meeting/interacting/superimposing (that of…

Can the weak interaction / beta decay / radioactivity occur without the presence of neutrons? Half-life is based on the degeneration of neutrons, which is measurable because it's time-bound, so I presume that radioactivity is not something between protons and neutrons, but actually caused by neutrons?

I am aware that our tools to describe and understand the various physical scenarios are models and not to be substituted (confused with?) what we are imagining them to describe. That said, these models can be separated (perhaps) into macro models (classical) and micro models (quantum mechanics) I understand there is overlap in the models and that the atomic scenario ,for example is described with the help of Special Relativity. So ,with those strong caveats ,is there any sense in which we can say that the realities described by the micro models have any sort of hierarchical precedence over those described by macro models? …

Hi to all, My paper will be published in Pramana, the respected and highly mathematical peer-reviewed journal of physics of the Indian Academy of Sciences. The accepted version is attached and all comments, thoughts, questions, and criticisms are welcome. I look forward to input and discussion regarding the argument presented. FTLSDemon.pdf

Were their any unexpected anomalies found in Bells Inequality test data aside from those predicted by QM? what was the frequency for Alice and Bob choosing the same test?Please dont answer unless you know. e.g. Don't just assume it was 1/3. I'm not sure 1/3 is the correct expected results and it may be significantly lower than that such as 1 time in 4 when opposing testors chose the same measurements. Have tests of analogous classical systems been used as a control? such as for what kind of variance to expect? What about Monty Carlo sims of classical systems? Any unexpected results from classical results? What kind of variance was experienced for all results? in genera…

In modern view on quantum mechanics wavefuntion collapse is no longer a ‘mystical out of physics’ phenomena, but is seen as a result of interaction with the environment (‘einselection’) – there is still some concrete unitary evolution behind. So there should exist ‘Hamiltonian of the Universe’ describing evolution of everything. We have similar situation in (classical!) field theories: for Euler-Lagrange equations (like Klein-Gordon: [math] d_{tt} \psi = \Delta\psi - m^2 \psi [/math] ) the evolution operator is self-adjoint – can be diagonalized (spectral theorem). The evolution on the [math] \lambda [/math] coordinate is: [math] d_{tt} x = \lambda x [/math]. So th…

I am developing a list of fundamental formulas in QFT with a brief description of each to provide some stepping stones to a generalized understanding of QFT treatments and terminology. I invite others to assist in this project. This is an assist not a course. (please describe any new symbols and terms) QFT can be described as a coupling of SR and QM in the non relativistic regime. 1) Field :A field is a collection of values assigned to geometric coordinates. Those values can be of any nature and does not count as a substance or medium. 2) As we are dealing with QM we need the simple quantum harmonic oscillator 3) Particle: A field excitat…

For non-physicists I will provide a short introduction: There are three fundamental interactions in the Standard Model we are studying and they are (in no particular order) 1) The Electromagnetic interaction 2) The Strong Nuclear interaction 3) The Weak Nuclear interaction There are additional efforts to introduce the Gravitational interaction to the Standard Model (SM) as well but non so far have been proven due to technological difficulties of reaching such high energy levels even in CERN's LHC. The first successful unification was the Electroweak interaction, a huge triumph of the Standard Model that has advanced physics immensely even as far as Physical Cosmology wher…

Schrodinger wave function is representing a massless electric wave "The wave-function physical means and determines a continuous distribution of electricity in space, the fluctuation of which determine the radiation by laws of ordinary electrodynamics." (Schrodinger, Abstract). which is a fact and Planck's energy element (hv) represents the energy of an electromagnetic photon which is another fact. Therefore, using Planck's energy element (hv) to represent the energy of an atomic electron is physically invalid since the energy of an electron is dependent on the kinetic energy (1/2 mv^2) if I am not mistaken. Quantum mechanics produces a structural and ener…

How can an electron position probability that represents a positive value or zero represent wave interference?

Light is a wave of potential that emanates from the point of origin to the point of perception. At the point of perception, its potential is realized by its potential collapsing to a probability of “1”. At this point we know its properties take on the form of a “particle”. At what speed did this “particle” just traverse linear space? At that speed, how does this particle experience time? So does this “particle” exist in every moment in space on its way to reach perception, or is it only aware of the one moment it exists? Furthermore, when the potential of the wave collapses to a probability of “1”, does it make sense that the “particle” knew every differing moment in spa…

Thank you for letting me post here; I hope you don't mind. Some time ago I read that the median distance between the smallest measurable distance (Planck length?) and the farthest measurable distance (known universe) was approximately 6 miles. Is this correct? Has this changed? It came up in a conversation recently and I couldn't find the information to back it up. Then I realized it might have changed since I last read it. Thank you for your help, Em

I have been doing a bit of reading into particle physics and quantum theory lately and I'm having a bit of trouble understanding what a virtual particle and how they are allowed if they break the law of conservation of energy.

Why has the Planck's constant has a value of 6.62606957 × 10−34 joule∙second, and a standard uncertainty of 0.00000029 × 10−34 joule∙second ? Explain me the uncertainty.

I have been trying to figure out what the wave function is. I think the wave function describes the probability of a particle being in a certain place once the wave function collapses, but as far as the math goes, I am pretty lost.

So I was chatting today with a colleague at work who is a it scared of radiation and scared of mobile phones since he'd read it somewhere that those can give you cancer. Obviously, I tried to explain him as well as I could that microwaves are not a type of ionising radiation and that the power output of mobile phone transmitter is not sufficient to produce damage through heating effects akin to what happens in a microwave oven. Not sure whether that helped, but then I started thinking that I might not have been 100% correct. It's a tiny issue, but nit-picking is my thing Anyway. Normally microwaves can't ionise atoms, the energy of the photon is not sufficient, b…