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35 views

Equation of the movement of a spring

They propose me the following exercise: "Find the equation that describes the movement of a mass $M$ attached to a spring of constant $k$ , knowing that the friction force is directly ...
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30 views

Implementing Drag in the Verlet Method in Mathematica [closed]

I am trying to implement using the Verlet method function that I have below with a drag force (F = mg - kv^2). I am under the assumption that I will simply create an acceleration function that takes ...
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8 views

Generating a percussion sound wave

I'm working on a software project which is a sound synthesizer. I need to add a percussion sound. Right now, the way I generate one beat is by generating a square wave and then multiplying it by 0.1^...
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1answer
38 views

I am learning electricity and magnetism remotely, what is the best tool kit in the market for a home lab to accompany this college course? [closed]

My university suspended all labs in the physics department and there is no virtual option, but for me to understand E&M I need to see some live experiments and do them myself. What lab kit on the ...
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0answers
28 views

Hadamard Gate implementation in MATLAB vs. IBM model [closed]

I am trying to build a circuit on IBM's quantum computer. I am checking every step as I go along on Matlab to make sure I fully understand everything. Everything was going well until I tried to add in ...
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Hello guys. I have been trying to write an equation in Mathematica, can somebody help me [closed]

$\sqrt{\det[\gamma^{\mu \nu} F_{\mu \nu}]}$ Basiclly I need to expand this equation in some form like : $trF^4 + (trF^2)^2 + \sqrt{\det[F_{\mu \nu}]}$ where $\gamma^{\mu \nu}$ are Dirac matrices in $...
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29 views

Books and courses on Computational quantum mechanics

Can you please suggest the best book and course available on computational quantum mechanics using Mathematica and python or Matlab.
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6 views

I'm trying to add a colour to the LogicalVolume in Geant4. I get the error that fVisAttributes and visAttributes are undefined. How can I fix this? [migrated]

I'm trying to add a colour to the LogicalVolume which has been renamed to TrackerLogical in Geant4. I get the error that fVisAttributes and visAttributes are undefined although I have defined them in ...
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1answer
25 views

How I simulate this in CST Studio? [closed]

I am trying to simulate this coaxial transmission line setup for EMI shielding. Placed the Aluminium sample as seen below (in the middle). I am new on this software, learned simulating the coaxial ...
3
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1answer
43 views

Software for matrix-product state calculations

Which software packages exist to either numerically or analytically do matrix-product state calculations? (Such as finding the ground state, time evolution, bond decimation, symmetries..) Which are ...
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24 views

Contour Integration in Mathematica [migrated]

I need to solve an integral similar to following for a project: \begin{equation} F[p^2\_,q^2\_]\equiv\int_0^{\infty}dk\, e^{-k/\lambda}\, \frac{k}{k-b[p^2,q^2]- I\epsilon}\ln(k-b[p^2,q^2]) \end{...
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1answer
38 views

Is ECI a pseudo-inertial frame?

The Python poliastro package documentation states that, when propagating from position and velocity vectors, the orbit's reference frame will be "one pseudo-...
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1answer
44 views

Is there software or code that is used to simulate hot ion plasma?

How are hot plasma simulated like fluid particles in CFD? Note: If this question is topic, i will eventually delete question but i only need an answer.
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41 views

Any suggestion for a DFT software package for a beginner?

I would like to do start doing some basic calculations using DFT. I am interested in solid state physics of strongly correlated materials in 3d or 2d. I prefer free software (no license) which is easy ...
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1answer
88 views

Analytic solution to the Kepler problem from position + velocity initial conditions

I am writing a javascript program (web page) that uses iterative simulation to show the motion and mechanics of a satellite in orbit around the earth. So far, using only circular orbits, it has been ...
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14 views

Any open-source to animate 2D materials in 3D. (e.g. van der Waals heterostructures, 2D crystal layers etc.)

I want to model different 2D nano-structures, layered materials in 3D (animated version). Is there any open source where I can build these structures?
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1answer
54 views

Double spherical pendulum simulation difficulties

I've been working on a simulation project of mine that I kind of need help with. So, as made obvious by the title, I am attempting to simulate the motion of a double spherical pendulum. I am writing ...
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0answers
66 views
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1answer
88 views

Github for Physicists

I am wondering if there is a platform to which researchers share or publish the code they used in their research. I noticed that many researchers explain their algorithm and math and present the ...
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2answers
65 views

Does anyone have a workflow for doing basic classical mechanics problems in Mathematica?

I've become really interested lately in the Wolfram Language and using it to work through problems in physics. I'm in a first year course in classical mechanics right now, and I was wondering if ...
3
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1answer
93 views

(Python) Solving Tolman Oppenheimer Volkoff equations

I'm trying to obtain the Mass-radius diagram of a non-rotating neutron star, following the work of Oppenheimer and Volkoff (I consider an EoS of a free Fermi gas of neutrons) : $$E(x)=\epsilon_0\...
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29 views

Physics Event Generators computational Complexity

The computational core of physics event generator is the code that numerically calculates,from first principles, the fully differential cross section $e$. In general terms, a cross section $e$ ...
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2answers
109 views

Mechanical simulation does not stabilize around equilibrium point [closed]

There is a classical problem which is a bead in a vertical hoop that is rotating around its vertical axis. If $R$ is the radius of the hoop, $m$ the mass of the bead, $\omega$ the angular velocity of ...
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1answer
30 views

How do you randomly draw samples from the probability density function of the quantum harmonic oscillator in MATLAB?

The Quantum Harmonic Oscillator in the ground state is specified by the following Gaussian PDF in two dimensions: $$p(x,y)= \frac{M \omega_x}{\pi h}\sqrt{ \frac{\omega_y}{\omega_x}} e^{-\frac{M}{h}(\...
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0answers
12 views

Softwares to simulate magnetic levitation in superconductors

I am a student who's looking to simulate magnetic levitation in superconductors, and I was wondering if there is a software that can do this - perhaps Ansys (I'm seeing some good potential, but I'm ...
3
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0answers
20 views

Estimating the focus plane of camera via thin lens equation [closed]

I have a camera that outputs a JSON file for every image taken. In the JSON file, I can find camera-specific and also the photo-specific acquisition parameters used. The issue is I wish to estimate ...
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0answers
23 views

CFD inlet condition

I'm new to CFD and I developed compressible Euler equation CFD code. But I couldn't calculate in the proper way. I got a bad result like the figure(gif). So, I think my boundary conditions are wrong ...
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0answers
17 views

NuShellX code at around A=132

I have recently started using the NuShellX code to simulate nuclear excited states. I have been able to get the code to work for the exmaples inlcluded such as Ne22 as well as some higher mass nuclei ...
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0answers
14 views

What is the procedure for calculating the high symmetry $k$-points (gamma, L, X, W, U) by geometrically and automatically?

what is the procedure for calculating the high symmetry k-points (gamma, L, X, W, U) by geometrically and automatically? How to calculate the same things in VASP?
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1answer
428 views

Why does my binary star simulation only work for equal masses and initial speeds?

I made a 2D gravity simulation is JavaScript using something called p5.js, you can find it here: https://editor.p5js.org/christofferaakre/sketches/ZVfm6cPR if i ...
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1answer
142 views

COMSOL Cherenkov radiation

As indicated in the title of the discussion, I would like to know if it would be possible to simulate through software based on the finite element method COMSOL Multiphysics the movement of a particle ...
1
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1answer
38 views

Is there any free utility/software to generates and numerically solve the field equation for modified gravity $f(R)$

I'm looking for a free software (preferred to run under Windows) that can generate the gravity field equations for a given $f(R)$ model in modified gravity. I used Maxima to calculate a few terms, ...
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0answers
26 views

Is there a good physical simulation software (mainly refers to the rigid body mechanics simulation)? [duplicate]

I want to simulate the examples in theoretical mechanics and analytical mechanics. I need a mechanical simulation software, which can customize the force field, spring, rigid body, connecting member ...
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1answer
61 views

Wavelength and Wavenumber not matching from Spectracalc [duplicate]

When I use Spectracalc.com to calculate the peak wavelength at 500 Kelvin, I am told the peak is at 5.79551 µm. When I switch the calculation result to wavenumber the peak is said to be at 980.506 cm-...
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0answers
31 views

Error in FWHM of photo peak

I have spectra for different sources I need to find the FWHM of to determine energy resolution of a scintillation detector. I have taken spectra and then fitted a gaussian to the photopeak: The scipy ...
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1answer
90 views

Engineering Equation Solver (EES) Entropy returning NEGATIVE numbers [closed]

I am using Engineering Equation Solver (EES). When I try to find Entropy given Temperature and Quality (liquid) at saturation pressure for carbon dioxide I keep getting a negative number. s=...
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0answers
33 views

Calculation of atomic spectrum

I need to calculate spectrum of Hg atom (wavelength and transition intensity), taking into account relativistic corrections. Can someone suggest a software or a package for atomic spectroscopy, that I ...
2
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2answers
60 views

Using technology in Physics [closed]

Currently I find that technology is a wonderful tool in efficiently understanding physics. It helps in giving access to resources and providing a better understanding of topics but what I dislike is ...
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0answers
11 views

Simulating Thin Film Bulk Acoustic Resonator based on Lateral Field Excitation on COMSOL

I am a beginner to COMSOL and I have to simulate a Thin Film Bulk Acoustic Resonator based on Lateral Field Excitation on COMSOL. Can someone give me a detailed approach on how should I do the ...
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0answers
18 views

X-Ray simulation software suggestions

Asking here as a 'specialist' location, as opposed to the regular 'software suggestion'. I am looking to find a way to generate synthetic x-rays of a 3D model. The closest I've found (Free) was http:/...
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1answer
68 views

Simulated gravity equations

I'm working on a game that'll have a (I probably naively believe) simple gravity component and am looking for a couple of equations for the task. Given 1) a ball rolling from point A down (or up) a ...
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0answers
28 views

Looking for a freeware software/app that can solve eigenvalue problems symbolically

I'm taking a quantum mechanics course and my homework involves extremely tedious algebra to solve symbolic eigenvalue problems. I'm looking for a software that I can give matrices with symbolic ...
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0answers
60 views

Propagation of a Gaussian beam using FFT [closed]

I am trying to simulate the propagation of a gaussian beam through a lens using an FFT approach. I tried to implement the approach described by Couairon in this paper at page 43: https://link....
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1answer
76 views

Interpreting Slater-Koster files for DFTB

I have a question about interpreting .SKF files, I am using these parameters to model defective graphene, when I use parameter set given here: dftbBaby/C-C (I think this is from Hotbit) or the ...
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0answers
17 views

Best software to fit molecular spectroscopy data

I have some data from a molecular spectroscopy experiment, containing vibrational and rotational spectra, and I want to fit the peaks with Voigt profiles (one for each peak) in order to obtain the ...
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1answer
31 views

Can we plot a FFT for a Decibel vs Seconds data?

I was plotting FFT for Decibel values corresponding to the time in which it was recorded using a DAQ for My project, The sample data looks like this, I was attempting to plot the FFT thinking that ...
4
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0answers
241 views

Fermion four-point vertex Feynman rules

So I have a theory which has a four-point fermion interaction $$\mathcal L_{int}=-g(\bar\psi\partial\!\!\!/\psi)(\bar\psi\partial\!\!\!/\psi).$$ I'd like to derive the Feynman rule for the ...
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1answer
66 views

Time dilation in the Reissner-Nordström metric [closed]

According to Wikipedia, the formula for gravitational time dilation in the vicinity of a charged mass is: $$\varsigma = \sqrt{|g^{t t}|} = \sqrt{\frac{r^2}{Q^2+(r-2 M) r}}$$ However, if I plug in $M=...
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1answer
62 views

Building realistic simulation using differential equations [closed]

I am building simulation using differential equations to model the motion of a damped vertical spring-mass system. I wish to use this simulation to extract data. For example, I am trying to find the ...

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