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U.Mars globe logo still PNGU.Mars — Encyclopedia


Unit 4

History of the Universe:
Particle-Antiparticle Annihilation

The early Universe was filled with a quark-gluon plasma, in which all kinds of particles and anti-particles — quarks & anti-quarks, leptons & anti-leptons — were flying around along with force-carrying particles (bosons).

Within this hot, dense universe, particle-&-antiparticle pairs were colliding and annihilating to become energy (photons), and also pairs of photons were interacting to convert into particle-antiparticle pairs.

A particle and its anti-particle are colliding and producing a burst of gamma-ray energy (photons in red squiggly lines, in the animated image below). This is called matter-antimatter annihilation.

animated GIF of particle and antiparticle pair annihilation

Thanks to:
Universe Adventure — LBL Physics