# What is Computational physics: Definition and 166 Discussions

Computational physics is the study and implementation of numerical analysis to solve problems in physics for which a quantitative theory already exists. Historically, computational physics was the first application of modern computers in science, and is now a subset of computational science.
It is sometimes regarded as a subdiscipline (or offshoot) of theoretical physics, but others consider it an intermediate branch between theoretical and experimental physics - an area of study which supplements both theory and experiment.

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36. ### Perform an image deconvolution using FFTs and Python

Homework Statement [/B] This problem is from Mark Newman's Computational Physics, problem 7.9, found at http://www-personal.umich.edu/~mejn/cp/exercises.html. The problem gives us a blurry convolved image, according to a Gaussian point spread function and our objective is to deconvolve it to...
37. ### The order of calculating velocity and position alters the solution?

So I tried solving the differential equation for a spring - mass system using Euler's Algorithm in Python. The equation being d2x/dt2= -4π2x (The equation was obtained by Dimensional Analysis) here x and t are both dimensionless equivalents of position...
38. ### Programs Is a 2nd major in comp sci useful in computational physics?

I'm majoring in physics and I'm planning on pursuing computational astrophysics in graduate school. Will a second major in computer science/programming look good to graduate schools, and/or will it give me great advantages in the field of computational astrophysics or astronomy?
39. ### Hamiltonian for a 1D-spin chain

Homework Statement [/B] A 1D spin chain corresponds to the following figure: Suppose there are ##L## particles on the spin chain and that the ##i##th particle has spin corresponding to ##S=\frac{1}{2}(\sigma_i^x,\sigma_i^y,\sigma_i^z)##, where the ##\sigma##'s correspond to the Pauli spin...
40. ### Quantum I need a book to solve Schrodinger's eqn numerically

I have found this one that looks perfect: https://www.amazon.com/dp/331999929X/?tag=pfamazon01-20 THe problem is that it has not been published yet :( , but I can't believe there is no other book on the subject. What I want is to solve numerically the Schrodinger equation with no special...
41. ### A How can I simulate 2D correlated data with continuous-valued variables?

Not sure this is the right area to post this. Let's say I have particles on a lattice, and they all have some property (ie, color) that is correlated at some known correlation length. I want to simulate this! In 1D I could do something like have color be a random walk in the given dimension...
42. ### Other Why Choose Computational Physics?

Hello, I've been wondering lately why would one change study path from theoretical or applied physics to computational physics or become a simulation expert? I am a physics graduate myself and based on the job market where I live I might need to pursue material sciences or computational...
43. ### A Restricted Open Shell Hartree Fock Method

Hello, dear scientists and forum users. I have recently finished programming the restricted closed-shell and unrestricted Hartree-Fock matrix equations. They seem to work fine for small diatomic molecules. However, I cannot understand the restricted open-shell theory that was firstly published...
44. ### A Symmetry Considerations in Hartree-Fock-Roothaan Method

Hello, dear Quantum Chemists or Physicists. I have been extensively researching the restricted closed-shell Hartree-Fock method, and wrote a code that is working for diatomic molecules, like H2 or He2++. I, however, have a few unresolved questions that do not allow me to proceed further in...
45. ### A What resources are available for using DFT to study 1D materials in physics?

hello dear physicists I will work in my thesis on 1D materials using DFT as a numerical method to find the properietes of these 1D materials I would be very happy if someone can help me with references (books, links, articles, vedios ...) that could help me to advance in my work Thank you
46. ### I How can I convert chi-square into a matrix and graph likelihood contours?

Hello, I'm new to the world of "numerical" astronomy/cosmology and I've been studying maximum likelihood estimation for model tests. The (analytical) theory is somewhat easy to understand, but I've been struggling with the numerical aspect of the computations. Suppose you have some model with a...
47. ### Programs Which subfield of physics should I choose?

Hi everyone; I have a question, and I hope you could answer it. Well, I have a bachelor degree in physics/computer science and I plan to go to a graduate physics program; however, I don’t know which subfield is good for me. I was looking for computational astrophysics, computational condensed...
48. ### Applying Computational Physics to Car/Bicycle Accidents

This article does an analysis of a angled street intersection where a lot of fatal bicycle/car collisions happen in England using knowledge of basic Physics and some programming: https://www.wired.com/story/the-physics-of-the-69-degree-intersection-that-kills-cyclists/
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### I Computational physics - Light trajectory near black hole

Dear all, I am currently doing a project about the light trajectory near Schwarzschild black hole. I wrote down a couple of differential equation and I have created a C++ program hoping to solve the orbit of light. However, the program results turn out to be quite weird. The differential...
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### Physics Interested in grad school in Computational Physics, help?

Undergrad with about a year and a half of school left here! The looming spectre of the real world has come with the realization that I do not know anywhere near enough of physics and math to satisfy me. I love math, I want more than anything to understand and do work that involves computers at...