fotonitörmäyksessä
Fotonitörmäyksessä, sometimes referred to as photon-photon scattering or light-by-light scattering, is a quantum electrodynamics (QED) process where two photons interact directly with each other. Unlike classical electromagnetism, where photons are considered to propagate without interacting, QED predicts that this interaction is possible through the temporary formation of virtual particle-antiparticle pairs, most commonly electron-positron pairs.
This process is extremely rare and has a very low probability of occurring. The virtual particles mediate
Direct observation of fotonitörmäyksessä has been a significant experimental challenge. However, evidence for this phenomenon has