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Questions tagged [software]

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31 views

What are some good physics engines for computations? [on hold]

I am interested in knowing what kind of physics engines for academics exists in the industry. Whether one is working on cosmology to electromagnetism to quantum mechanics, are there any general ...
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0answers
12 views

Graphing dispersive wave packet in Desmos [on hold]

I want to find a way to graph a dispersive wave packet using a graphing calculator app such as Desmos. The above is a graph of a non-dispersive wave, which is pretty easy to represent on a Cartesian ...
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0answers
8 views

Signal parameter estimation in PyCBC

I have a gravitational wave signal (strain vs. time). And I want to find out the corresponding parameters of the compact binary. But I do not know how to create injection for this signal in PyCBC. ...
0
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0answers
30 views

Mathematical software for calculating Christoffel symbols, curvature, etc [duplicate]

I'm looking for a Mathematical software that can do the following: I put in a metric (some kind of a two-dimensional matrix), and the software calculates Christoffel symbols, Ricci curvatures, ...
2
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2answers
62 views

Simulation software to solve high school level mechanics problems

I'm a physics teacher and I would like to find a simulation software that could be used to give exact numerical answers to high school level problems in Newtonian mechanics. I want the students to ...
0
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1answer
26 views

Wave-packet backwards emission

I am trying to reproduce the results of a TDSE two wave-packet algorithm described in "Computational Physics: Problem Solving with Python" by Landau, Paez and Bordeianu, in section 22.4 (Wave Packet–...
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0answers
50 views

“Data structure” for a fermion field

I am understanding the path integral formalism of fermion fields. Most textbooks told me that grassmannian integration is only algebaric notation. It shouldn't be understood in a Lebesgue Integral ...
0
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1answer
28 views

Is it possible to have discontinuities in the phase portrait of a dynamical system? If yes what does it really mean?

I've been using Mathematica to draw the phase portrait of a system and I got some jumps along the trajectory. I have a deviation term which might be the reason of this but is it possible to have them ...
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0answers
71 views

Numerically Solving EM problems. Book covering: ABS, PML, Near field calcul., LU fact, BicGstab, Pardiso etc

I looking for a book (or two) covering a range of topics: numerical implementation of boundary conditions (PEC, PMC, ABS); perfect matching layer; LU factorisation; numerical solvers and when to use ...
1
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2answers
60 views

Making sense of phase portrait of simple mass-spring oscillator

I'm new to physics, and I'm having trouble making sense of phase portrait of the following system, $$ m \ddot{x} + k x = 0 $$ whose phase portrait is in here. Since $$ x(t) = \sqrt{\frac{2E}{k}} \...
4
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0answers
136 views

$N$-body gravity simulator: why does energy conservation break down when introducing an adaptive timestep?

I am playing with an N-body gravity simulator using the velocity-verlet algorithm. In the actual simulation I normalize everything so that it is nicely behaved numerically, but I'll express things in ...
1
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1answer
44 views

Cross sections in Geant4 [closed]

Does anyone know where I can find the information about cross sections in Geant4? I would like to use my own file with cross section (exported from another code to MC simulations), but I cannot find ...
0
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1answer
87 views

Can anyone tell me how can draw shadow of black hole like in presented in Intersteller movie? Is there any code for it in Mathematica or in Python? [closed]

Equation of motion for photon $$ \Sigma \frac{dt}{d\lambda} = aL\left(1-\frac{r^2+a^2}{\Delta}\right) + \omega\left(\frac{\left(r^2+a^2\right)^2}{\Delta}-a^2 \sin ^2\theta\right)\ , $$ $$ \Sigma\frac{...
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0answers
19 views

Program for calculating transition amplitudes

I calculated transition amplitudes with MBPT analytically and used Slater-Condon rules. Now I have a very long expression and I would like to solve my matrix elements. Does someone know a program for ...
1
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1answer
62 views

Math notation for heating object

An object with mass $m$ and heat capacity $c_{p}$ is exposed to heating $P_{th} $[kW] and thermal losses $\dot q$ [kW/°C]. The energy equation illustrating the process of heating it from $T_{max}$ to $...
0
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0answers
26 views

Is there a mass spectrometer software that can measure the mass of a hydrogen atom [duplicate]

For a school project I need to measure the mass of a hydrogen atom either as a lab experiment or with a computer simulation. Since I don't have the appropriate equipment for the experiment, does ...
0
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0answers
47 views

Is there a mass spectrometer software that can measure the mass of a proton

I spent a lot of hours looking for mass spectrometer software (or Cathode-ray simulator) that can measure the mass of a proton or any sub atomic particle. Until now I only found software that work on ...
1
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2answers
240 views

Implementing a spherical pendulum

I am trying to implement a spherical pendulum. The Lagrangian (which I haven't fully understood so yet) based on $l$, θ and φ taken from this page result in the equations: \begin{align} \...
1
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0answers
70 views

Why does conservation of energy appear to be violated? [closed]

I am currently working on a rigid body simulator. Before getting proper collision and rotations working, I decided to simulate the collision of spheres as axis-aligned objects. The simulation works ...
0
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1answer
80 views

Is there a general algorithm for conversion of units?

I'm not exactly sure where the best place to put this, as it's more of a general question about dimensional analysis. I decided I was tired of having to convert units all of the time, and was not ...
1
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0answers
47 views

Collision response with spring physics in RK4

I'm trying to figure out what's in the title. I've gotten regular spring physics working and now I'm trying to do something similar with actual collisions (player character colliding with the ground ...
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0answers
27 views

Where can I find an interactive vector field?

Imagine a low-pressure system as a vacuum that sucks all the surrounding air straight towards it, creating many vectors of wind that all focus on one spot. Because of the Coriolis effect, each of ...
0
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2answers
51 views

How to animate a ball rolling down an incline?

I'm using Lagrangian mechanics to come up with the equations of motion for a ball rolling down an incline. I've come up with the following two equations. $$\begin{alignat}{1} \dot{x} &= \frac{2}{...
2
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1answer
56 views

Visually and physically reasonable analytic approximation to the field of a bar magnet

I want to produce publication-quality drawings of the field of a bar magnet, in both the field line representation and as a "sea of arrows." I've found some open-source software that looks like it ...
1
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1answer
107 views

Weird results of Monte Carlo simulation

I'm simulating the 3D Ising Model using the Wolff update algorithm. I am using the Mersenne Twister RNG. When the lattice size is $L = 50$, the specific heat curve looks very weird!! I want to ...
2
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0answers
102 views

Is there an alternative to SIMION?

Is anyone aware of an alternative, possibly open-source, to the SIMION software? From their website: SIMION is a particle optics simulation software primarily used to calculate electric fields ...
1
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0answers
107 views

COMSOL magnetic field time dependent [closed]

enter image description here I need to modelling conductor in Comsol 5.3 by MF physics in Time Dependent study Conductor model "Single conductor" in "Coil" feature doesn't work in TD study, and ...
3
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1answer
62 views

Laplace's heat equation equilibrium functions

I simulated the Laplace's heat equation on a grid (200x200) with boundary conditions of 0 (a cold source) on the top and left and 1 (of hot source) on the bottom and right. (see gif) I stopped ...
1
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1answer
128 views

How to improve this simple Brownian motion simulation by adding viscosity?

I've written a 0th order Brownian motion simulator to envision how a particle of smoke might appear to move under a microscope. There will be missing $\sqrt{2}$'s and $\frac{\pi}{2}$'s since I haven'...
5
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3answers
272 views

Extracting the 3D coordinates of a moving object from a video

Take a look at these two pictures, which are stills from a video which demonstrates magnus effect in football: I want to extract the coordinates of this ball in 3D space from this video. These are ...
2
votes
1answer
104 views

Relation between curvature in orthonormal basis and in “standard” metric form

Im familiar with both formulations of GR - standard with metric and connection coefficients and that based on orthonormal frames and differential forms (Cartan's structure eqns) in solving Einstein's ...
12
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3answers
1k views

Does quantum mechanics allow you to simulate chemical reactions in software?

I'm a software developer interested in learning quantum mechanics to simulate chemistry. I know it's a very difficult topic, so I consider it a long term "someday/maybe" goal, and I’m not sure it's ...
1
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1answer
143 views

Tensor Product Explanation

I'm currently doing a research project involving 3 particle spins and have developed a simple function for the Hamiltonian: I understand how to code my work but the physics behind it is unfamiliar ...
2
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0answers
53 views

Latex tool for Feynman diagrams [duplicate]

Is there a tool for drawing Feynman diagrams that can be used to post these diagrams on physics stack exchange?
2
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0answers
59 views

Barkana & Loeb's Virial Radius Plot [closed]

Recently I have been trying to teach myself the basics of modern cosmology. To do so I have been using Barkana & Loeb. I've been working my way through and come to virial radius. They give the ...
1
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1answer
33 views

File with particle decay data [closed]

Does anyone know of a computer parsable file that has basic physics and decay data for (quite many) observable particles, such as mesons, barions, heavy leptons and $W, Z, H$? To clarify the data I ...
0
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2answers
184 views

Is kinematics required to solve for the quaternion dynamics of a tumbling body?

I'm trying to solve for the rotational motion of a rigid body in the absence of external torques using quaternions in MATLAB. Assuming the axis of rotation as the unit vector $\begin{bmatrix}a_x & ...
0
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0answers
102 views

FFT for data sets without any well defined frequency

I am trying to implement FFT algorithm on a data (density of particles) to obtain structure factor. The problem is that in MATLAB (and probably any DFT algorithm which is out there) the assumption is ...
-1
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1answer
22 views

How to plot a vector field? [closed]

I am reading articles of vector fields, such as magnetic field and sound field. I am very curious about how the vector fields are drawn, such as the pictures shown below. Any reference to this ...
0
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1answer
100 views

Bouncing ball with friction

I am trying to write freefem code (same language as c++) for a bouncing ball, but i am not able to notice the result of friction force. At each time the rigid ball hits the rigid ground , the ...
2
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0answers
117 views

Seismology - PPV / VDV from geophone waveform data

I'm using an inexpensive seismometer to try and measure the effects of local HGV traffic on buildings. The device is connected to a Raspberry PI that has a Cirrus Logic Audio Card. The signal is fed ...
0
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0answers
86 views

Action describing a scalar field in a classical curved background

Been trying to derive equation (6.54) in Quantum Fields in Curved Space by N.D. Birrell & P.C.W. Davies (p. 162): \begin{align} ^{(2)}H_{\mu\nu} &\equiv \frac{1}{(-g)^{1/2}}\frac{\delta}{\...
0
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1answer
45 views

What are some useful resources for simple two-body quantum simulation?

Are there available, commercial or free, numerical packages for simulating quantum dynamics that have built-in tools especially for quantum mechanics? For the purpose of this question, I want to ...
0
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1answer
39 views

How do I calculate the wavenumbers for a Broadband CARS system?

I had the question when I was reading a paper by Camp (High-Speed Coherent Raman Fingerprint Imaging of Biological Tissues), and I've been researching how to calculate wavenumbers from the 4 wave ...
2
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1answer
87 views

Which program to analyse and graph laboratory measurements?

I'm interested in which program would you recommend for drawing graphs with x and y errors. Also to be able to analyse data and then graph it. My ideal graph would look like this: Until now I was ...
1
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3answers
83 views

Resource required for learning simulations in physics

I know basic programming in C and Fortran. I want to learn simple simulations in physics to have some idea about it. Right now I don't have any idea about it. Can someone refer some online/offline ...
2
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4answers
125 views

Nuclear Physics Modeling Software

I have a nuclear reactor design I would like to model. I would like to show the individual atoms and how they interact with each other in the reactor (specifically, I would like to model decay modes, ...
0
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1answer
29 views

How to change speed based on gravity, and angle of movement?

I am making a simple coding project where a white dot is orbiting another dot. I could not find a mathematical formula to change the speed of the dot based on its movement direction proportional to ...
0
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1answer
134 views

Computer Simulation of Elastic collision

I am trying to calculate the collision of 2 balls of equal mass, assuming the collision is perfectly elastic, for a computer physics simulation. Given the coordinates of both balls and their initial ...
2
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0answers
74 views

How to define a non-uniform mangetic field in Geant4 simulation?

I am getting stuck in creating a gradient magnetic field by Fieldmap method in example of field04 (geant4/extend/field/field04). At the moment, I am doing OK with creating a uniform one by creating a ...