0
votes
0answers
5 views

Eigen energy of the Landau levels in a tilted magnetic field

The problem pertains to a fermi gas in a tilted magnetic field confined by a harmonic potential in the z direction. I chose the vector potential $(0,ax-bz,0)$. I obtain the following hamiltonain with ...
0
votes
0answers
7 views

Impulse in perfectly elastic collision

I am implementing this simplified model at the moment, and I am trying to get my head around the physics concepts behind this model. Event-Driven Simulation So the model has two parts, first is ...
0
votes
0answers
10 views

Could baryon asymmetry be explained by the big bang as a pair production event?

If the big bang is considered as a vacuum fluctuation then might we assume an antimatter/ anti-baryonic universe was created at the same time as our matter universe. If there is some theoretical way ...
-5
votes
1answer
16 views

Homework question

It is a worksheet given by the school which I'm unable to solve; please solve it. .
0
votes
0answers
6 views

what is the focal length of the lens @ the far point

How to find the focal length at the far point if focus objects clearly from 50cm to 600cm . Representing the eye as a simple lens 2cm from the retina.
0
votes
1answer
9 views

Will temperature,pressure and volume effect the value of universal gas constant in any way?

effect of variables on constants Will temperature,pressure and volume effect the value of universal gas constant in any way?
0
votes
1answer
27 views

Is there any place in the universe where time passes more quickly than in the milky way?

I also understand that due to the relative orbital velocity, time on Earth is dilated compared to the centers of the solar system and galaxy. Is there a place that the Milky Way rotates around, and ...
0
votes
0answers
21 views

Invariance of State Vector under Two Operations

I am trying to understand why if you measure one non degenerate operator you get a new state w1v let's say with w1 eigenvalue, then let's say u measure a new operator that has degenerate eigenvalue v ...
0
votes
0answers
11 views

Applications of exponential family Markov random fields in statistical physics

Ising model and its relatives are popular in statistical physics. Are there any physical systems that can be characterized by exponential family Markov random fields (e.g., the one in http://arxiv.org/...
0
votes
0answers
5 views

Why is it that only thermal energy is available in a particle propagating throughout a space-charge layer in a plasma (not kinetic)?

In this PDF on page 5 the author explains that a particle moving through a space-charge (electron density in a plasma) gains only thermal energy. Should there not also be kinetic energy?
0
votes
0answers
31 views

Bigger tire/Smaller Tire

On a track, bigger tires have more contact therefore more traction. However, it comes at a cost of more unsprung weight. Therefore, the 0-60 time is slower as tested by Car And Driver. This was tested ...
1
vote
1answer
36 views

Name of electric force

during a lab experiment, i noticed that a metal ball has a much harder time rolling on metal rails when their is a current passing through it and the rails. I was wondering why and if there was a name ...
0
votes
1answer
28 views

What am I doing wrong in this error propagation question? [on hold]

I got the right values for the certain values (A x B). However, whenever I multiply the uncertainty values (𝛿A x 𝛿B), I still can't seem to get the right answer. Here are the two problems I'm stuck ...
3
votes
1answer
45 views

Is there an angular velocity operator in quantum mechanics?

In classical mechanics we can write as velocity of a rotating object $\vec{v} = \vec{\omega} \times \vec{r} $ or in analogy the momentum $\vec{p} = m (\vec{\omega} \times \vec{r})$ using the angular ...
-1
votes
0answers
35 views

Can osmosis go the other way?

There is an effect called diffusio-osmosis, by which a flow is induced close to walls, and is ultimately caused by the repulsion of solute molecules by the solid wall around the pore. See this older ...
3
votes
2answers
306 views

How far would an arrow go in a space station and still be deadly?

So I was answering a question on the WorldBuilding SE site and one aspect of my answer made me wonder. Imagine you are on a massive space station of unlimited size. If you were to fire an arrow from ...
0
votes
2answers
34 views

Is critical mass of fissile material the same in gravitational fields with different force?

Let's take plutonium-239 for example. $10\, Kg$ (sphere $9.9\, cm$) need for a nuclear reaction. Are we talking about these numbers in Earth environment with $\approx 9.8\, m/s^2$ gravitational ...
-3
votes
0answers
55 views

I can't grasp the idea of how Newton's laws are coordinate dependent? Could anyone suggest me any book for problem solving in classical mechanics [on hold]

I am reading Classical mechanics by Goldstein and have crossed 55 pages and still couldn't grasp how Newtons law is coordinate dependent. And I problems in Goldstein are extremely difficult is there ...
0
votes
1answer
19 views

Electric field of a line charge, along itself

look at the pic : What is the electric field in along the line of charge with charge density $\lambda$ and length $L$. Is the electric field zero along the line without any difference in height?
0
votes
0answers
22 views

Electro-magnetic fields and Faraday Cages

If you have an area that is affected by an electromagnetic field, would it be possible to build a Faraday cage and then build a device INSIDE the Faraday cage so that it would work (as opposed to ...
0
votes
2answers
33 views

Discharging a capacitor

Suppose I have a charged capacitor, meaning there's a voltage (electric potential difference), say, $2V$, between its two plates. We don't know the electirc potential of the individual plates, right? ...
0
votes
0answers
6 views

Quantitative measurement of electrostatic induction

How is it with the electrostatic induction measurement? Everywhere you can read about the effect of electrostatic induction but I still can't found any detailed explanations or quantitative ...
0
votes
1answer
15 views

Is there a maximum power rating for fiber optics cables?

I'm at an internship and I've been tasked with projecting the image with a projector in a direction different than where it would normally go. I am looking into fiber optics, but it doesn't seem like ...
0
votes
2answers
27 views

Quadrupole moment of point charges?

We know that due to expansion, the Quadrupole potential equals $$1/4\pi \epsilon r^3 . \int (r^\prime)^2(\frac32. \cos^2\theta^\prime-\frac12)\rho(r^\prime)d\tau$$ but what is the equation for point ...
0
votes
1answer
35 views

Orbiting in space

Background I'm making a game where a spaceship needs to orbit another object in space at a set distance. Space is, unlike other game, like space is in reality. Friction less. (at least to my ...
1
vote
2answers
33 views

How does the uncertainty product $\Delta x \Delta p$ behave for the bound states of the triangular potential?

As has been remarked earlier, if you take an unbounded potential $V(x)$ (so that all the eigenstates are bound) and you look at the uncertainty product $\Delta x\Delta p$ as a function of the index $n$...
0
votes
0answers
34 views

Examples of other hierarchy problems

The commonly quoted version of the hierarchy problem (at least, the one that I have heard), is concerned with the surprisingly low mass of the Higgs. We would expect the Higgs mass squared to have ...
0
votes
3answers
55 views

Notation to represent frequency and acceleration in preparation for algorithms

I hope this is the right place to ask. IMO it's the most appropriate SE site. I would have chosen mathematics; I didnt because I am using units such as force and Hz, and want equations to have ...
3
votes
1answer
26 views

Running Constant Values At Very Low Temperatures

From Wikipedia Coupling Constants, using QED as an example. I realise that the one-loop beta function in quantum chromodynamics is negative. If a beta function is positive, the corresponding ...
-1
votes
0answers
22 views

Quantum mechanics: charged particel in magentic field [on hold]

Suppose a particle is moving in an uniform magnetic field $B$ in the $z$ direction. How do we find the time dependence of the position coordinate operators. I tried to work in the Heisenberg picture, ...
0
votes
2answers
41 views

Reciprocal Time Dialation in Special Relativity [duplicate]

I'm trying to understand theory of special relativity, but there is one thing that really makes me confused which is reciprocal time dilation in special relativity. In special relativity, the time ...
2
votes
0answers
13 views

Chiral spin liquid flux states on the Kagome lattice

Short version: Is it possible to arrange the fluxes for the Kagomé lattice with triangle flux $\phi_\triangle=\frac{\pi}2$ and hexagon flux $\phi_{hex}=0$ using a single unit cell? Longer version: I ...
1
vote
0answers
24 views

Lorentz surfaces, conformal metrics and eigenvalues

From what I understand of Lorentz surfaces (spacetimes of dimension 2), it seems that, according to Kulkarni's theorem, two reasonable enough Lorentz surfaces (I am only interested in surfaces with ...
-5
votes
1answer
39 views

How to find speed (not velocity) of a body during a projectile reaching an height $h$ twice? (Please read description- I want to do it my way) [on hold]

If a body is projected at an angle (theta) with horizontal, it reaches a a certain height h two times. Within this time, find the speed (not velocity) of the object? I was trying to solve it by the ...
0
votes
0answers
31 views

A question from <Conformal Field Theory> by Francesco etc

In the book ''Conformal Field Theory'' by Francesco etc. there is a statement on PP. 48, after Eq.(2.187): $$\left\langle\frac{\delta X}{\delta A_\mu(x)}A_\nu(y)\right\rangle+\delta(x-y)\delta_{\mu\nu}...
1
vote
2answers
60 views

De Broglie- Bohm Quantum Theory

From what I have read the Standard Model of Particle Physics uses quantum mechanics,special relativity, along with other assorted mathematics to make predictions and provide a framework for QED, QCD, ...
-1
votes
0answers
15 views

Alternate derivation of the Thin Lens equation

Is there another, fairly straightforward way to derive the Thin Lens equation without using similarity of triangles?
0
votes
1answer
48 views

Generators of $SU(2)\times U(1)$

I'm currently reading about spontanous symmetry breaking. In particular about a Lagrangian that is invariant under $SU(2)\times U(1)$, in other words pretty standard QFT stuff. I know that the ...
0
votes
0answers
25 views

Domains in Ferromagnetism

I am currently reading the book "Introduction to electrodynamics" by David J. Griffiths. As far as I understood, a Ferromagnet when not applying external magnetic field, the magnetic dipoles inside a ...
0
votes
0answers
70 views

Why don't we have to go through the Lagrangian in QM? [duplicate]

In classical mechanics, I remember whenever we calculated the Hamiltonian, we'd first have to calculate the Lagrangian, and then we'd get the Hamiltonian through the definition: $$H= \sum\dot q_ip_i-...
-9
votes
0answers
30 views

Is a sea of massive gravitons what ripples when galaxy clusters collide and is it what waves in a double slit experiment? [on hold]

Dark matter has been recently theorized to consist of massive gravitons. If the massive gravitons interact with matter then could they be what relates general relativity and quantum mechanics?
0
votes
0answers
18 views

Books recommendations for my theoretical physics library [duplicate]

long story short: I got a big prize from my scholarship, which consists in a lot of money for books, and I mean a lot: almost USD$ 3000. Thus, I am going to buy lots of books, of course! So I'm ...
-9
votes
0answers
26 views

Would Einstein and de Broglie have agreed it is the sea of massive gravitons which waves in terms of gravitational and wave-particle duality waves? [on hold]

If 'empty' space is a sea of massive gravitons which matter moves through and displaces then would Einstein and de Broglie consider it to be the medium for gravitational and wave-particle duality ...
-1
votes
3answers
100 views

What would happen if a ball flew through the open window of a car?

I asked a science teacher this question a while ago but I did not receive a clear answer. Now, I was hoping someone on this Physics site could shed some light on my conundrum, I've been wondering for ...
-1
votes
1answer
29 views

Quantum vacuum thruster and conservation of momentum [duplicate]

I have been reading about the quantum vacuum thruster on Wikipedia and I think I understand the idea of virtual particles being created and destroyed but what I don't understand is how this is ...
-1
votes
0answers
26 views

Find the momentum the force creates on the corners of the rectangle [on hold]

In this problem there is horizontal force of 100 N pointing away from the right top corner and the task is to find the moment it causes at every corner. The sides of the rectangle are 5 and 3 meters. ...
0
votes
0answers
16 views

How to apply the time evolution operator on a 2 level system

I'm struggling to understand how to actually solve analytically the time evolution of a given initial state with the Hamiltonian \begin{equation} H =\epsilon*\sigma_z + \Delta*\sigma_x, \end{equation} ...
1
vote
1answer
54 views

Need clarity about relativity/magnetism explanation

Please bear with me - this is not a duplicate question.... From what limited knowledge I have gathered, it seems that when two wires in parallel are carrying equal current, the electrons moving in ...
-5
votes
0answers
23 views

If massive gravitons fill 'empty' space and are displaced by matter then is curved spacetime the state of displacement of the gravitons? [on hold]

APS Physical Review D: Massive gravitons as dark matter and gravitational waves Precursor: Bigravitons as dark matter and gravitational waves The massive graviton is a viable candidate of dark ...
1
vote
0answers
31 views

How to prove two methods are “similar”? [on hold]

We are testing two imaging machines. One of the machines has been validated numerous times. However, we built the new machine and we need to prove that it is similar/comparable to the validated ...

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