Questions tagged [physics]
Questions related to the application of Mathematica to problems in physics.
970
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Value of a function over permutations of two lists
I want to do the sum (in Ising lattice gauge theory)
...
- 411
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1
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Sum on a lattice where variables can only take two values (Ising lattice gauge theory)
I want to study the Ising Gauge Theory which has the Hamiltonian
\begin{equation}
\mathcal{H} = -J \sum_{n,\mu,\nu} \sigma_3(n,\mu)\sigma_3(n+\mu,\nu)\sigma_3(n+\mu+\nu, -\mu)\sigma_3(n+\nu, -\nu)
\...
- 411
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How to calculate Einstein tensor components for this metric?
I try to calculate the Einstein tensor compenents from the eqution:
$
G_{\alpha\beta} = \frac{\nabla_\beta (\partial_\alpha \phi)}{\phi} - \frac{1}{2\phi^2} \left[ \frac{\partial_4 \phi \partial_4 g_{\...
- 287
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Plot after applying NIntegrate
I'm trying to integrate and graph $I$ vs $b$ the following integral (eq. 24 in this paper) in wolfram mathematica
$$ I = \int_{2}^{\infty} \frac{g_i^3 \mathcal{K}_t \mathrm{~d} r}{r^2\left|\mathcal{K}...
- 117
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Numerical ground state wavefunction of Schrödinger equation with a Coulomb potential in 2D from NDEigensystem
I want to numerically solve the ground state wave function of the hydrogen atom with the Coulomb potential using the NDEigensystem. Here is the code to get the ground state wave function from the ...
- 51
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1
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163
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Animating a double spring spherical pendulum
I want to make an animation of a double spring spherical pendulum. The first mass is connected to the ceiling with a spring, and the second mass is attached to the first one with a spring too. The ...
0
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1
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103
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Change of variable of a numerically solved integral
I have the following function that numerically integrates a function on the interval $\left[ 2, 100 \right]$
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- 117
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1
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93
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Writing a function that sorts by low powers while ignoring higher powers of various variables
I'm writing a Mathematica code with the aim of automating operator mixing calculations in QCD (at least at one-loop order). So far, it can generate Feynman rules and all graphs, assign the rules, call ...
- 11
1
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0
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84
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Intensity pattern [closed]
I'm trying to get the following intensity pattern from this paper
In the Newtonian case, the equations for the intensity (eq. 9 and 10 in the article), I put them in Mathematica with the change $b^2 =...
- 117
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How do you create a program to calculate the spectrum of a pulse of arbitrary shape?
Develop a program designed to compute the spectrum of a pulse with an arbitrary shape. My current program might not suitable for solving this problem.
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Animation of double pendulum with a spring (3DOF)
I've got a problem with animating a double pendulum where the first mass is connected with a ceiling with a bar and the second mass is connected with the first one with a spring. Below is my code ...
1
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1
answer
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Plot solution of an integral with parameter
In this article, they solve the following integral
$$ \mathcal{I}_{o b s}\left(\nu_0\right)=\int_{\gamma_i} \frac{(A(r))^{3 / 2}}{r^2} \sqrt{\frac{1}{A(r)}+r^2\left(\frac{d \varphi}{d r}\right)^2} d r ...
- 117
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1
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Animation of a spring pendulum
I would like to animate a spring pendulum. Below is my piece of code. The Lagrangian and equations are correct, in which I am sure, but the animation looks terrible and non-realistic.
Could someone ...
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2
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Making the timestep of Euler method integration a variable
I am fairly new to Mathematica, and I've been trying to implement the Euler method of integration for a fluid velocity field. I can't work out how to make the timestep a variable of my Euler method ...
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