Simulating the nonlinear dynamics between a scalar and a massive vector field in an expanding universe.

Heavily modified version of GABE C++ code for paper https://arxiv.org/abs/2007.10978. Solves coupled differential equations for early universe reheating on finite spatial lattice. Plus helpful mathematica noteboks (made by me).

Steinmetz, A. Modern topics in relativistic spin dynamics and magnetism. PhD dissertation. University of Arizona, 2023.

Exploring 3D space expansion using OpenGL based on the least resistance principle.

Rafelski, J., Birrell, J., Grayson, C. et al. Quarks to Cosmos:. Eur. Phys. J. Spec. Top. 234, 1125–1329 (2025).

This repository includes mathematica codes for reproducing and cross-checking the results from sterile neutrino dark matter pioneered papers. Also it includes codes for freeze out and freeze in processes using toy models.Along with this, there are codes for leptogenesis process using neutrinos in early universe.

Simplified Models and subHalos distributions

Author-maintained paper, data and code for "Bayesian Evidence for Angular Symmetry and Spectral Curvature in the Nanohertz Gravitational-Wave Background" (Symmetry 18, 1169).

Cosmological applications of the SymC framework. Applies χ ≈ 1 stability principles to universe-scale phenomena including cosmic acceleration onset, black hole thermodynamics, and cyclical cosmology. Demonstrates framework consistency from quantum boundaries to cosmic structure.Retry

Colab code making sure GRTT doesn't break the early universe and ends up with essentially what we currently have

Rafelski, J., Birrell, J., Steinmetz, A. and Yang, C.T. A short survey of matter-antimatter evolution in the primordial universe. Universe 9.7 (2023): 309.

Steinmetz, A., Yang, C. T. & Rafelski, J. Matter-antimatter origin of cosmic magnetism. Phys. Rev. D 108 (2023).

JWST high-redshift anomalies unified via Temporal Equivalence Principle. Tests isochrony axiom violation using Cepheid-calibrated response prior. Kinematic SUSPENSE comparison (N=15) shows Γ_t predicts spectral age (ρ=0.752, p=1.23×10⁻³) better than stellar mass. Dust Uniformity Paradox and mass-sSFR relation at z>7 support TEP framework

This essay presents a clear and intuitive overview of the full Siamese Universe framework. It explains how a shared quantum vacuum, a minimal phase desynchronization, and CPT symmetry together generate matter, structure, and cosmic complexity. A causal narrative linking physical principles and observable signatures.

CMB, BAO, and Big Bang Nucleosynthesis constraints on the Temporal Equivalence Principle using CLASS, AlterBBN, and Cobaya MCMC.

Paper-plot pipeline for the Blue-Tilt Milky-Way simulation · Phys. Rev. D 112, 023512 (arXiv:2412.16072)

Codes used for Master's thesis work

This work introduces the concept of Latent Structural Causality, a framework for describing physical entities that are formally present yet lack observable effects in certain regimes. Applied to cosmology, it interprets the emergence of gravity, light, and time as transitions of operativity rather than creations ex nihilo.

🌌 Explore latent structural causality to redefine physical existence in unobservable regimes and deepen understanding of cosmology and physics foundations.