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Particle creation and annihilation

| 🗖 nosplit | ↑ parent "Dirac equation" | words: 133 | descendant words: 157 | descendants: 3
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Predicted by the Dirac equation.
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We've likely known since forever that photons are created: just turn on a light and see gazillion of them come out!
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Photon creation is easy because photons are massless, so there is not minimum energy to create them.
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The creation of other particles is much rarer however, and took longer to be discovered, one notable milestone being the discovery of the positron.
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In the case of the electron, we need to start with at least enough energy for the mass of the electron positron pair. This requires a photon with wavelength in the picometer range, which is not common in the thermal radiation of daily life.
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Ancestors

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