Do photons bounce off of each other?

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What would happen if a photon moving in one direction were to meet another photon moving in a perpendicular direction? Would they behave like billiard balls and bounce off each other, would they just pass through each other, would they combine together somehow and move in some new direction, or something else?
 
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Photon-Photon scattering is possible but this effect is observable in fields of extreme strength.
 
Usaf Moji said:
What would happen if a photon moving in one direction were to meet another photon moving in a perpendicular direction? Would they behave like billiard balls and bounce off each other, would they just pass through each other, would they combine together somehow and move in some new direction, or something else?

They would usually behave as waves and create interference patterns instead.
 
They could become a particle/antiparticle pair too. But ordinarily they'd go about their merry business.
 
I read Hanbury Brown and Twiss's experiment is using one beam but split into two to test their correlation. It said the traditional correlation test were using two beams........ This confused me, sorry. All the correlation tests I learnt such as Stern-Gerlash are using one beam? (Sorry if I am wrong) I was also told traditional interferometers are concerning about amplitude but Hanbury Brown and Twiss were concerning about intensity? Isn't the square of amplitude is the intensity? Please...
I am not sure if this belongs in the biology section, but it appears more of a quantum physics question. Mike Wiest, Associate Professor of Neuroscience at Wellesley College in the US. In 2024 he published the results of an experiment on anaesthesia which purported to point to a role of quantum processes in consciousness; here is a popular exposition: https://neurosciencenews.com/quantum-process-consciousness-27624/ As my expertise in neuroscience doesn't reach up to an ant's ear...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
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