Search for anisotropic Lorentz invariance violation with {\gamma}-rays

Understand

While Lorentz invariance, the fundamental symmetry of Einstein's theory of General Relativity, has been tested to a great level of detail, Grand Unified Theories that combine gravity with the other three fundamental forces may result in a violation of Lorentz symmetry at the Planck scale.

• These energies are unattainable experimentally.
• However, minute deviations from Lorentz invariance may still be present at much lower energies.
• These deviations can accumulate over large distances, making astrophysical measurements the most sensitive tests of Lorentz symmetry.