Quote:
Originally Posted by G8HQP Dave
A particle does not have to come from somewhere, provided that its antiparticle also appears at the same time. There is a form of common-sense in physics: conservation laws have to be satisfied, and most symmetries have to be respected.
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This is why it is somewhat surprising that almost all the material detected in our universe, so far, seems to be composed of what we call normal matter without any matching quantity of anti-particles.
Where have they all gone?
Is there another universe, somehow beyond our ken where all the anti particles live?
Are the concepts of symmetry and conservation just local niceties?
When you get well away from our sort of scale of things the universe becomes a very strange place. Positions, energies and existence of particles start to become statistical as we get smaller. Most of the things we derive comfort from seem to go out the window.
David