Interpretation Definition and 835 Threads

Is there a simple geometric interpretation of the Einstein tensor ? I know about its algebraic definitions ( i.e. via contraction of Riemann's double dual, as a combination of Ricci tensor and Ricci scalar etc etc ), but I am finding it hard to actually understand it geometrically...

The way the classes and functions are named confuses me. What is the program trying to do? class Y { long y; public: Y() { y = 4; } long get(long yy) { long ret = yy * y; y = yy; return ret; } }; class X { long x; Y y; public: X() { x = 7; } void Xx(long xx) { x += y.get(xx); } int get() {...

While studying energy on Sears & Zemansky's University Physics, I came up with a doubt on the meaning of kinetic energy. The book gives two possible physical interpretations of this quantity. I'm okay with the first meaning of KE but I don't understand completely the second one. I don't...

I have a question about the Many worlds interpretation. Does the observed mass of the Higgs boson suggest that the many worlds interpretation is incorrect, as the mass falls smack in the middle of the predicted values of both supersymmetry and multiverse interpretations of the standard model of...

I am trying to create a third angle projection of this isometric drawing and for the most part it is very straight forward. However, I cannot figure out where to position a 'circle' of radius 25 to give me the correct curvature that is required for this drawing. Whenever I locate a circle and...

1. Homework Statement Ct= (∫0 1 (Ct(i) ̂(1-1/ε)) di)^ (ε/ε-1) So Ct (i) denotes number of good i consumed by the household. But what is Ct ? What does it mean to take the intgral from zero to 1 for all the Ct (i) ?Homework EquationsThe Attempt at a Solution

What are advantages and disadvantages of hidden variable interpretation of quantum mechanics?

Are there any interpretation to general relativity that described gravity as field (which do not have to be vectorfield, but may have 10 components) and physical-space as classical euclidean space? Can it be mathematically proven that such interpretation can not exist? I am not talking about...

In the following, I want to consider both photons in a sharply focussed, monochromatic beam of light (''type P'') and electrons in an electron beam (''type E'') on the same footing. In the following, X is either P or E. If we only concentrate on the internal degrees of freedom, both kinds of...

z1,z2,z3 are distinct complex numbers, prove that they are the vertices of an equilateral triangle if and only if the following relation is satisfied: z1^2+z2^2+z3^2=z1.z2+z2.z3+z3.z1 so i shall show that |z1-z2|=|z1-z3|=|z2-z3|but i do not know how to start.

Perhaps not an appropriate place to ask this. I've completed a question which is phrased as the following: Explain, on thermodynamical grounds, why the minimisation of the energy E(S, V, N) yields the equilibrium state of a system with fixed entropy S, volume V and number of particles N. I...

Hey there. Based on the many worlds interpretation, is: Everyone simultaneously having coffee with everyone else? Has everyone already had coffee with everyone else? Are these possibilities occurring 'somewhere' continuously? Do these possibilities only occur one at a time, or does the...

Homework Statement I get that less percentage energy is conserved from potential to kinetic energy by measuring h and v with two balls for the heavier ball. I am trying to sort of why actually is like that! Two balls where dropped down from a ramp with different masses and volume. The smaller...

Homework Statement Two containers with saturated fluid at T0, while having different total volume V1 and V2 definition of total molar volume: total liquid + vapor volume divided by the total moles Problems: 1. Compare the density of the vapor in both containers 2. Compare the density of the...

In this thread, I want to discuss the implications of quantum field theory for the interpretation of quantum mechanics. To set the stage I'll import in the next few posts a number of posts from other threads. The latest of these is the following: Only if it is the sole particle in the whole...

Hiya, Another me trying to grasp some physical experiment. I'm working myself through a Dutch popular science book "Snaartheorie" (String Theory) by 'our' professor Marcel Vonk: it's meant to give the reader a maths-less impression of the theories behind string theory. Vonk starts with an...

Hi, While solving a system of linear equations, there are three possible cases - unique / infinite / no solutions - to the system. One geometric interpretation is when one looks at a set of planes intersecting at one / many / no points respectively, for each of the above cases. While going...

Hello, I have been doing research with a certain biological substance and its capacitance and conductivity. The following graphs are from a computer connected to a BDS (broadband dielectric spectrometer): I understand the fundamental units, but Re(C'), Re(C''), Re(σ'), lm(σ'') do not make...

Hi! I'd like to know of f'(x)/f(x) has some special interpretation, some physics or math concept related. This ratio appears many times in control theory...

It’s easy enough to find the interpretations that break counterfactual definiteness in order to maintain locality. But I’m not sure how to find the ones with something (perhaps information) moving backwards through time. The reason I ask is I’ve always had trouble with the idea that a...

I ask this question because I am confused. I have seen two contradictory definitions. In this link: http://science.howstuffworks.com/science-vs-myth/everyday-myths/parallel-universe2.htm The split causes a whole new universe. In this link:http://plato.stanford.edu/entries/qm-manyworlds/#2.1...

What is the physical interpretation of Cartesian coordinates in GR? Say, e.g., a system centered at the center of a spherical mass. What are x,y, and z physically, i.e., how are they measured?

The firewall has been proposed to explain why entanglement monogamy isn't violated in the AMPS thought experiment. The firewall is hypothesized to break the entanglement between the particle pairs of Hawking radiation created near the horizon so that the total sum of radiation emitted by the...

I have a question regarding the quantum event when a wave live photon transforms into a particle like photon. In the many worlds interpretation there is a split into multiple worlds. My question is this: Do all the multiple worlds supposed to see the photon transform into a particle like photon...

I don't see how the Copenhagen interpretation and the second law of thermodynamics can be compatible. In the Copenhagen interpretation, upon losing coherence the system chooses a single definite state and all other possible states are eradicated. This seems to be losing entropy to me, as it's...

Hi, I am an amateur enthusiast and this is a direct question (not a proposal, I'm not nearly qualified to offer a proposal). I would like to throw to experts and people who are more qualified, because it's got me a bit stumped. Could I ask for an answer which is as simple as I am please, lols -...

I don't like the common interpretation of coherence of two waves. Please tell me if something is wrong in my argumentation: 1. It is often said, that, if two waves are coherent, then the interference pattern is stationary, which means, that the amplitudes are the same. And often, this...

There's something I don't quite get about most illustrations about Bell's inequality theorem. I will explain what: Consider a pair of entangled photons fired at two arbitrarily oriented polarizers. I most explications, it seems the author suggests that the hidden variable represents the binary...

I have been learning about the different interpretations of QM, and I am trying to build a taxonomy of them in my mind (I find that trying to build taxonomies is a good way of learning about things). I have read about collapse theories and non-collapse theories. If I have got this right, the...

Hi, I don't understand the F-S interpretation of the E<0 energys of the Dirac Equation. I´m mainly reading about this in Francis Halzen´s book: Quarks and Leptons sec. 3.5. The book states: And then says: e^{-i(-E)(-t)} = e^{-iEt} Is he referring to the operator that evolves H eigenstates in...

Hello, I'm trying to apply formula 30 as described on page 12 of this paper: https://lirias.kuleuven.be/bitstream/123456789/261102/1/IJAMT_journal_final.pdf However, the results I am getting when testing against the table of results on that same page for Al 2024 (Rm = 435 N/mm2) are off in my...

Depending on interpretation of QM, can hilbert space be considered just as real as space time? In MWI the wave function is real, but still lies in hilbert space, so would hilbert space be considered a real space according to this interpretation?

Hi all, This question is similar to a question asked previously, but slightly different. I understand that there have now been attempts to extend the Broglie-Bohm, or Pilot Wave, interpretation of QM to QFT. I'm a layman, but if I understand correctly, the standard method for computing the...

What is physical interpretation of velocity potential? Is a conservative quantity, i.e, line integral of velocity potential around a closed loop is zero>

If an ODE of 2nd order like this A y''(x) + B y'(x) + C y(x) = 0 has how physical/electrical interpretation a RLC circuit, so, how is the electrical interpretation of a system of ODE of 1nd and 2nd order? \begin{bmatrix} \frac{d x}{dt}\\ \frac{d y}{dt} \end{bmatrix} = \begin{bmatrix}...

Homework Statement M= \begin{pmatrix} 2 & -1 & 0\\ -1 & 2 & -1\\ 0 & -1 & 2\\ \end{pmatrix} Compute \frac{1}{6}\epsilon_{ijk}\epsilon_{lmn} M_{il} M_{jm} M_{kn} . The Attempt at a Solution I computed the result which is 4, by realizing that there are 36 non-zero levi-civita containing...

When interpreting the results of the two channel Bell test, I believe there were roughly 40 nanoseconds between when the particles were created and when they hit the polarized lens. It is believed that sometime during this time information passes between the entangled photons so that they match...

So let's say you're sitting on the ground (observer A) and there's a car or something that moves at .99c (observer B). (Of course, this is all hypothetical) Now, my interpretation goes that when A is seeing B, the information he gets is distorted, namely due to time dilation, length contraction...

I always wondered that what is the physical interpretation of integration . How come integrating position gives as velocity? Can some one explain me what is physical insight of integration ? Ignore my poor communication skills.

In my mind they are all the same. But some serious physicists (Schlosshauer, for example) claim there is no evidence for the existence of collapse. What about Lyman alpha emission, where an electron in a hydrogen atom “jumps” from level two to level one and emits a photon? Or the...

Many may be familiar with the Libet experiments that suggested that the brain begins the process of preparing for a motor action before the subject decides to make the action. This has been discussed and argued over a great deal in the past several decades. I came across this in reading about...

Hi, I've been reading some (very) basic texts on decoherence and have some questions about it: 1. What is the difference between decoherence and dephasing? 2. Assuming decoherence, can we completely do away with collapse theories (i.e. theories in which wavefunction collapse must be...

I'd like to learn how I can better understand research papers/scientific studies, judge the quality, the methods used, find out who funded it, etc. I'm a layperson. In researching various topics, especially controversial subjects, I try to find the actual scientific papers behind everything...

Very simple question for you, friends. As is well known, usual integral has interpretation as square under function's graphic. Then, what is double (and triple) integral by analogue? Thanks!

Can the M theory/ string theory coexist with the penrose interpretation of quantum mechanics?

As I (attempt to) follow the discussions on various QT threads here on PF, many of the subjects being discussed are frequently categorized as being an "interpretational" matter. Typically, this assertion is then followed by some statement that the formalism of QM remains the same regardless of...

I have it on good authority that decoherence (probably) solves the preferred basis problem and explains the suppression of interference phenomena; however there remains the question: why do we get outcomes at all? Unitary evolution of coupled systems results in entanglement and thus an improper...

A recent article on Proton/Lead collisions (http://physics.aps.org/articles/v8/61) used a graphic seen in earlier articles on Proton/Proton collisions (ie. http://arxiv.org/pdf/1206.0148v1.pdf). I understand the gray disks to represent protons just after the collision (flattened due to...

I have recently derived both the purely covariant Riemann tensor as well as the purely covariant Weyl tensor for the Gödel solution to Einstein's field equations. Here is a wiki for the Gödel metric if you need it: http://en.wikipedia.org/wiki/Gödel_metric There you can see the line element I...

Hi! I am new to ANSYS and I am trying to understand a simulation done by some one else. I have a disk with a spiral in it, and it looks like there is a remote force being applied at the centre of the disk, but spread over the entire face. I don't understand how this force is being spread...