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Questions tagged [wolfram-physics]

Questions relating to the Wolfram Physics project, and how to use Mathematica for it.

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How to simplify the results of squared amplitude calculations in FeynCalc?

I want to calculate the squared amplitude of the Feynman diagram of double-pion photoproduction using FeynCalc package. Here is the code I created: ...
Albert Copperfield's user avatar
3 votes
2 answers

Plot of Density of States Using DiracDelta Function [duplicate]

I am trying to plot the density of states $$ N(E)= \frac{1}{N}\Sigma_{k} (\delta{(E - \epsilon_{k}))} $$ where $\epsilon_{k} = -2t*[cos(k_x)+cos(k_y)]$ and $k$ goes from $-\pi$ to $\pi$. For this plot,...
CuriousMind's user avatar
6 votes
1 answer

How do I couple an 1D PDE to a 2D Laplace equation?

Recently I've come across the following system governing the spreading of an evaporating droplet. The height of the droplet $h$ is defined by the following equation $$\frac{\partial h}{\partial t}=-\...
FLP's user avatar
  • 547
1 vote
2 answers

How to demonstrate the acceleration using spherical coordinates and spherical unit vectors?

I've been trying to use Mathematica to demonstrate using spherical coordinates and unit vectors the acceleration for a particle moving in a sphere. Nevertheless, I'm actually not that skilled in ...
not_aphysicsdr's user avatar
2 votes
1 answer

How to Optimize Integro-Differential Equation Solving Time in Mathematica?

I'm trying to solve an integro-differential equation numerically in Mathematica that models the evolution of a physical system . However, the computation takes a very long time and doesn't yield a ...
Roy Smith's user avatar
3 votes
1 answer

Dirac equation for a Coulomb potential in 2D with 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 ...
AminD's user avatar
  • 51
3 votes
1 answer

Second order Poisson ODE

I have a 2nd differential Poisson equation for the electric field in a semiconductor (application for a MOS simulation, hopefully). I have the formula: with the condition that after a certain value(...
Andrei Nitescu's user avatar
1 vote
1 answer

How to plot from a condition and limit number of solutions?

I am trying to plot the band structure of some quantum mechanics problems, but I am really lost. From the math I get the following relationship between q and k ...
Juan Pedro Martinez's user avatar
1 vote
0 answers

Trying to interest Wolfram in correcting an error in a built-in function [closed]

There is a Mathematica function that produces a nonsense, non-physical output and I haven't managed to interest Wolfram in the problem. The function is: ...
David H.'s user avatar
  • 137
0 votes
0 answers

Feynman Two Loop Integrals

Is there any reference suitable for a beginner that you recommend for learning two loop integrals evaluation by hand ( and/or some package) that you know of? Thank you very much.
NovoGrav's user avatar
3 votes
0 answers

Is it possible to define substitution rules on edges instead of nodes [Wolfram Physics]?

I have a small question about the way substitutions work in the Wolfram Physics project, which might be a general question about how to add edges between nodes and edges. Running a Wolfram Physics ...
TumbiSapichu's user avatar
  • 1,603
2 votes
1 answer

What does the command '$FAVerbose = 0' do in FeynCalc

I have seen this right below the "<<FeynCalc`" command that loads FeynCalc. $LoadAddOns={"FeynArts"}; <<FeynCalc; ...
chicago.physicist's user avatar
1 vote
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four-dimensional Levi-Civita

Consider we have these four vectors $p^{\mu}$, $q^{\nu}$, $k^{\rho}$, and $k'^{\sigma}$. How can we calculate $$ \epsilon_{\mu\nu\rho\sigma} p^{\mu} q^{\nu} k^{\rho} k′^{\sigma}$$ in Mathematica, ...
zari's user avatar
  • 11
2 votes
1 answer

Plotting equation of motion in mathematica [closed]

Suppose I have an equation of a moving body in Newtonian Mechanics e.g. $ax^2=(b/t^4)+(c/t^2)$ how can I plot a x-t graph in mathematica with a range for the constants a, b and c from 0 to 5 with ...
ARIJIT PANDA's user avatar
4 votes
0 answers

How to recreate these physics style graph plots?

The new graphs from this blog post look really nice in a dark background: How to recreate the largest graph from above? What I've tried Nothing yet... there is probably a link or notebook that has ...
M.R.'s user avatar
  • 31.6k
1 vote
3 answers

How does one get the coordinates of a hyper-graph created in Wolfram Cloud?

With the new physics project you can create various hyper-graphs from simple rules. How can I download the coordinates of these graphs (show locations and relationship among all the nodes). For ...
Cybernetic's user avatar