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Something I've always wondered: Right after the Big Bang there was a massive annihilation of matter and anti-matter, with just a bit of extra matter. But the e
by ars 4y ago
Something I've always wondered: Right after the Big Bang there was a massive annihilation of matter and anti-matter, with just a bit of extra matter.
But the energy resulting from that annihilation did not go away. So where is it? No matter what form it takes, energy gravitates, so it should be able to be observed.
- frankchn 4y agoMy impression (I might well be wrong about this) is that the energy from that forms part of the cosmic microwave background radiation.
- exmadscientist 4y agoA lot of it just went back into producing particle-antiparticle pairs again. Some of it is the CMB, yes, but not all. Why we didn't just end up with even numbers of particles and antiparticles repeating this dance endlessly is the single biggest open question in particle physics.
- beeforpork 4y agoPhotons. Each annihilation event emitted a photon, and they are still around. IIRC, about 5e9 times as many photons are observed as there are baryons, and that seems to match up well with the calculated imbalance of the baryosynthesis.