Lorentz invariance

Lorentz invariance is a fundamental concept dictating that the laws of physics remain completely unchanged for all observers in uniform motion relative to one another. It essentially describes the symmetry between different inertial frames of reference, forming the mathematical bedrock of special relativity.

The concept and the associated transformations are named after the Dutch physicist Hendrik Lorentz. While Lorentz derived the mathematical formulas, it was Albert Einstein who later applied them to formulate his theory of special relativity in 1905.

It ensures that the speed of light in a vacuum is exactly the same for all observers, regardless of their relative velocity. Without this invariance, the fundamental equations of electromagnetism and modern particle physics would completely break down depending on how fast you were moving.

If Lorentz invariance were violated, it would imply that different inertial frames of reference have distinct physical laws, meaning the speed of light would change depending on how you moved. Physicists actively test for this in experiments, as such a violation could point to new theories of quantum gravity.