Kavli IPMU: How Particles Saved Us from Annihilation

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Kavli IPMU: How Particles Saved Us from Annihilation

Post by bystander » Tue Feb 04, 2020 5:06 pm

How the Tiniest Particles in Our Universe Saved Us from Complete Annihilation
Kavli Institute for the Physics and Mathematics of the Universe | 2020 Feb 03
Recently discovered ripples of spacetime called gravitational waves could contain evidence to prove the theory that life survived the Big Bang because of a phase transition that allowed neutrino particles to reshuffle matter and anti-matter, explains a new study by an international team of researchers.

How we were saved from a complete annihilation is not a question in science fiction or a Hollywood movie. According to the Big Bang theory of modern cosmology, matter was created with an equal amount of anti-matter. If it had stayed that way, matter and anti-matter should have eventually met and annihilated one to one, leading up to a complete annihilation.

But our existence contradicts this theory. To overcome a complete annihilation, the Universe must have turned a small amount of anti-matter into matter creating an imbalance between them. The imbalance needed is only a part in a billion. But it has remained a complete mystery when and how the imbalance was created. ...

Since matter and anti-matter have the opposite electrical charges, they cannot turn into each other, unless they are electrical neutral. Neutrinos are the only electrical neutral matter particles we know, and they are the strongest contender to do this job. A theory many researchers support is that the Universe went through a phase transition so that neutrinos could reshuffle matter and anti-matter. ...

Testing the Seesaw Mechanism and Leptogenesis with Gravitational Waves ~ Jeff A. Dror et al
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