# Questions tagged [computational-physics]

Questions with this tag should be about computational physics, which is the study of physical situations with the use of software (commercial or in-house). Please note that details of writing and/or debugging code is OFF-TOPIC and should be asked at either Computational Science, Code Review or Stack Overflow.

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### How to Plot Circle, Fade out Sound Mathematica? [closed]

My Professor is having me do a lab to learn the basics of mathematica, and I'm trying to figure out exactly how I would plot a circle chart with a radius of 2 [![Professor's Instructions ]] I ...
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### Mathematical Modeling - Metallurgical Composition (spatial and temporal) of a mineral from first principles

Problem Given the initial compositions of the "melting pot", could one define a mathematical model that expresses the spatial and temporal variation of the composition of a rock over a fixed ...
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### Do these Lagrange equations of 1st kind exhibit numerical instabilities?

I followed the lead of "Theoretische Physik", 1e, 2015 by Bartelmann et al. (pp. 171 - 174) to form the set of constituting Lagrange equations of the 1st kind for the double pendulum: eight ...
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### Quartz crystal resonance frequency simulation

Is there an open source/scientific software package that would allow to simulate Quartz crystal resonance frequency for specific cut angle, crystal geometry and temperature? How would one approach ...
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### Can we predict harmonic generation from Maxwell's equations?

One typical experimental setup to generate harmonics from a laser pulse is to irradiate some plasma stab with a laser, register both reflected and transmitted waves, and the spectrum of those waves ...
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### Dirac equation vs relativistic Hamiltonian

The fine structure can be derived by considering the relativistic Hamiltonian and also adding corrections for magnetic fields, etc. For hydrogen these effects are small, which makes it easy to obtain ...
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### How to generate a complete set of doped (substituted) structures?

I'm trying to analyse doping in a certain material in low concentrations. I'm approaching the problem by taking crystallographic unit cell of that material, then expanding that to a 2x2x2 supercell ...
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### Computational Physics Resources [duplicate]

I was wondering if anybody could please recommend any computational physics books please? I have a background in data science and I picked up the effective computation physics book by Kathryn Huff up. ...
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### Software packages for calculating Feynman diagrams [duplicate]

I am trying to calculate the two and three-loop divergences in a certain quantum field theory. This is beyond the domain where I can do anything by hand, and I would appreciate any recommendations ...
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### For an arbitrary Ising model, is there any numerical method to calculate its free energy with polynomial cost?

Specifically: calculate the expression: $$\sum_{s_i=\pm 1}exp(A_{ij}s_is_j)$$ Where index $i = 1 \sim M$, and $A_{ij}$ is an arbitrary real symmetric matrix. I am trying to find a method with ...
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### Determining the capacitive reactance of a capacitor graphically

I measured the voltage and current of an RC circuit with the frequency of $f=105 \;\text{Hz}$. I modified the current with a decade box and measured the voltages ten times. With these measurements I ...
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### Numerical code Friedmann equations [closed]

I have to write a numerical code to solve the ‘Ω-form’ of the Friedmann equation: H(t)^2/H_0^2 = Ωmat/a^3 + Ωrad/a^4 + Ωk/a^2 + Ωx/a^3(1+w) ...
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### Finding the dominant frequency of a stellar orbit

I was reading this paper on astro-ph (Sanders et al. 2020, "Models of Distorted and Evolving Dark Matter Haloes"). It's about modelling the gravitational potential in a cosmological ...
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### How can I process many time series to determine which are oscillating?

I have a simulated system of many particles (440) and want to determine if any of their velocities are oscillating or showing oscillatory behavior. I've tried looking at each of the velocity time ...
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### CERN ROOT resource recommendation

During my BSc., I used Python, C and Scilab in addition to Excel to perform data analysis on lab experiments. However, unfortunately I never got the chance to use ROOT which is one of the most widely ...
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### Renormalization Group approaches to many-body problems: An algebraic perspective

This is related to a question I asked a few months ago here. I haven't looked at it again until recently because I was busy with something very different, but now I am coming back at it and wanted to ...