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Questions tagged [software]

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1answer
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Cross sections in Geant4

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 ...
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0answers
16 views

How do I find information dimension using 2D wavelet analysis method in the Harfa Software? [closed]

I'm looking for help with the software Harfa. Specifically, how do I find the information fractal dimension and correlation dimension?
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1answer
72 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
18 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 $...
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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 ...
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0answers
46 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 ...
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2answers
177 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} \...
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0answers
69 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 ...
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1answer
54 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 ...
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0answers
45 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
26 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 ...
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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}{...
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1answer
54 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
98 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 ...
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0answers
88 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 ...
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0answers
83 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
61 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 ...
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1answer
108 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'...
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3answers
249 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
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1answer
98 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 ...
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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 ...
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1answer
118 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 ...
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0answers
52 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?
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1answer
87 views

How to undo or reverse a Kronecker product (tensor product) in QuTiP? [duplicate]

Let's say I have a qubit. A qubit is described by the two basis state $$|0\rangle= \begin{pmatrix} 1\\0 \end{pmatrix} \quad\text{and}\quad \ |1\rangle= \begin{pmatrix} 0\\1 \end{pmatrix}. $$ So a ...
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0answers
51 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
32 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 ...
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2answers
178 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 & ...
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0answers
98 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 ...
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1answer
21 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
82 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 ...
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0answers
104 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 ...
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0answers
82 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}{\...
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1answer
44 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 ...
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0answers
28 views

Obtaining ground state using Davidson algorithm

I want to compute the ground state of a Hamiltonian using Davidson Algorithm. I have written some code in python that I assume works alright. My problem is this: The dimension of the ground state ...
0
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1answer
33 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
85 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 ...
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3answers
70 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
122 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
125 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
68 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 ...
0
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1answer
47 views

Discontinuity in Fourier sine series for vibrating string

In physics class we learned that any string vibration with two fixed endpoints can be written as a superposition of normal modes, where the shape of each normal mode is given by $y(x)=A_n\sin(nx)$. As ...
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0answers
34 views

Software that can perform QMC on quantum Ising model

I'm trying to find a software that can perform QMC using the loop algorithm as outlined in the following lecture notes: https://www.cond-mat.de/events/correl13/manuscripts/wessel.pdf The closest ...
2
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0answers
162 views

How to code Tensor Networks?

I'm interested in learning tensor networks, I've been reading some introductory articles about this. The problem is that these articles mostly discuss the theoretical definitions for tensor networks ...
0
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1answer
48 views

Collider physics; what is a jet residual?

I'm looking at a list of jet parameters (in a .root file). One of them is called JetResidual. It's there alongside parameters like ...
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2answers
76 views

Software for simulating gas of hard particles (i.e. polyhedra?)

I was wondering if there existed a kind of software I could use to simulate a gas of polyhedra, such as tetrahedra. They would interact through entropic interactions only, i.e. excluded volume. I'm ...
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1answer
65 views

What is wrong with my model of aerodynamic drag?

I am creating a JavaScript program which simulates fireworks in a 2-dimentional context launching from the ground and exploding somewhere in mid-air. The program takes into account gravity and drag, ...
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0answers
142 views

Why does my Hartree Fock/SCF code work for small molecules (water, methane etc) but goes crazy for slightly larger ones (Benzene, Butadiene etc)?

I made a Hartree Fock code, in the psi4 package, following the formulas given on this page: http://sirius.chem.vt.edu/wiki/doku.php?id=crawdad:programming:project3 When I use the same geometry they ...
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1answer
414 views

How to calculate hydrogenic radial wave functions?

I'm learning Atkins' Physical Chemistry, and in chapter 9 I found that I cannot get the hydrogenic radial wave function from the formula the book given. $$ R_{n,l}(r)=N_{n,l} \rho^l L^{2l+1}_{n+1}(\...