Plasma Cosmology v0.1 - Galaxy Rotation: 3D MHD Simulation with Toroidal Magnetic Fields

We present Plasma Cosmology v0.1, a GPU-accelerated 3D ideal MHD simulation framework developed to investigate whether magnetic tension and J×B forces arising from a strong toroidal (azimuthal) magnetic field can provide significant radial support in galactic disks, contributing to the observed flat rotation curves. The code features: - Staggered Constrained Transport magnetic field representation - Conservative HLLD Riemann solver - FFT-based self-gravity (Poisson solver) - Strong toroidal magnetic field initialization (Z-pinch configuration) - Galactic rotation seed and rotation curve diagnostics Preliminary results show that the inclusion of strong toroidal magnetic fields improves the agreement between simulated rotation curves and observed data, compared to standard gravity-only models. This work constitutes an early numerical exploration in the Plasma Cosmology paradigm, testing electromagnetic effects as a possible alternative or complementary mechanism to dark matter for explaining galactic dynamics. This is version 0.1 — a foundational release intended as a starting point for further development and community contributions.