Fluctuation Definition and 59 Threads

recently i listened something about vacuum fluctuation.i don't know what exactly is it.but from that fluctuation is it possible to say that there is some width of the energy eigenvalue of a system where the particles are interact with em field.i don't know anything about field theory.

What's the underlying principle to demonposite metrict fluctuation as scalar ,vector and tensor? Is this decomposition complete?unique? for scalar mode, \begin{equation} \delta g_{\mu \nu}=a^{2} \left( \begin{array}{cccc} 2\phi & -B,_{i} \\ -B,_{i} & 2(\psi \delta_{ij}-E,_{i,j})...

I understand that vacuum fluctuations can spring into and out of existence within a sufficiently short period of time, under the uncertainty constraint. However, I am currently a little confused over how this constraint is applied. 1) Does one use del E.del t = h bar (the commutation...

Hi, I'm doing more experiments with magnets and I'm making a setup to see if current can be induced in a coil by mechanically strengthening and weakening the pole of a permanent magnet. I can do this very simply by manually rotating a spinning disk with magnets on it close to the fixed magnet...

to preserve commutation relations in the quantized field operators (basically simple harmonic oscillator raising/lowering operators), a vacuum mode must be introduced in the case of a usual 50-50 beam splitter. thus, one has 4 modes: vacuum incident mode reflected mode transmited...

hi i have fixed a simple circuit for lighting up a led.i have included a potentiometer. as the led is white i know that the voltage drop of the led is around 4v.when the potentiometer is at min resistance the voltege drop is actuallu around 3.8v.the problem is that when i turn the potentiometer...

I have a question. I decided not to put it in the "theory" section because I'm no physicist and I don't know if I'm right. From what I understand about the fluctuation theorem, the smaller the area in which it takes place, the more likely entropy is to decrease. Could it be at the beginning...

[SOLVED] vacuum fluctuation I have a few questions about this topic. 1. If their is build energy in vacuum (from Heisenberg's uncertainty principle), for example: build: 10 J ==> here for: d(t)=h/(4pi)/10J There must be built a particle and an anti particle ==> particle has 5 J and...

In quantum physics, a quantum fluctuation is the temporary change in the amount of energy in a point in space, arising from Werner Heisenberg's uncertainty principle." Quote from wikipidia". can someone tell me what caused the first, "temporary change", i am guessing that the first temporary...