The latest articles on DEV Community by Dan McCoy (@freedeathtv). https://dev.to/freedeathtv https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3608425%2F8940a614-62b1-48e4-8da3-bafa784514c9.gif https://dev.to/freedeathtv en Dan McCoy Wed, 12 Nov 2025 17:35:58 +0000 https://dev.to/freedeathtv/simulating-time-loops-in-a-shed-a-spin-biased-fdtd-journey-2l https://dev.to/freedeathtv/simulating-time-loops-in-a-shed-a-spin-biased-fdtd-journey-2l <p><strong>Toroidal CTC sim</strong> is a Python-based wave simulation that models directional delay in a closed-loop waveguide.<br><br> It’s built to explore what happens when you drag a refractive index perturbation around a torus—and how that messes with time-of-flight.</p> <p>I’m not a physicist. I’m a shed enthusiast. But I wanted to see if I could build a desktop analogue for closed timelike curves (CTCs) using classical wave mechanics. Turns out, you can.</p> <h2> 🔧 What It Does </h2> <ul> <li>Simulates 1D FDTD wave propagation in a toroidal geometry </li> <li>Applies a rotating index perturbation to bias wave direction </li> <li>Measures arrival-time shifts across a sweep of angular velocities (Ω) </li> <li>Outputs reproducible CSV timing data, plots, and animations </li> <li>Explores delay-based logic, recursive computation, and metaphysical edge cases</li> </ul> <h2> 📦 Built for Reproducibility </h2> <ul> <li>All parameters in <code>parameters.json</code> </li> <li>Results in <code>timing_data.csv</code> </li> <li>Modular code, clean CLI, and full documentation </li> <li>Zenodo DOI: <a href="https://doi.org/10.5281/zenodo.17592350" rel="noopener noreferrer">10.5281/zenodo.17592350</a> </li> </ul> <h2> 🖼️ Visuals </h2> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fzg9t2u6k1j6ok8vsqs8c.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fzg9t2u6k1j6ok8vsqs8c.png" alt="figure1.png" width="800" height="493"></a><br><br> <em>Arrival time vs. Ω — directional delay emerges as the perturbation spins</em></p> <h2> 🔗 Links </h2> <ul> <li>GitHub: <a href="https://github.com/FreeDeathTV/toroidal-ctc-sim" rel="noopener noreferrer">FreeDeathTV/toroidal-ctc-sim</a> </li> <li>Zenodo: <a href="https://doi.org/10.5281/zenodo.17592350" rel="noopener noreferrer">10.5281/zenodo.17592350</a> </li> <li>Concept paper: <code>concept_paper.pdf</code> in the repo </li> <li>Animation: <code>animation.gif</code> in the repo</li> </ul> <h2> 🧠 Why? </h2> <p>Because time loops are cool.<br><br> Because reproducible metaphysics is underrated.<br><br> Because sometimes the best place to simulate a paradox is a shed.</p> <p>If you're on arXiv or ResearchGate and resonate with delay-based logic, wave simulations, or metaphysical modeling—I'd love an endorsement or a nudge. This project is open-source, reproducible, and built for curious minds. Ping me or star the repo if it made you think weird thoughts.</p> <h2> 🏷️ Tags </h2> <h1> opensource #simulation #python #physics #fdtd #reproducibility #timetravel #computationalphysics </h1> opensource simulation python programming