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g.lemaitre
- 267
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In the First Three Minutes Steven Weinberg wrote:
The word "destroy" really throws me off. When I think of destroy I think of complete elimination from existence, such as when you destroy a house it is completely gone, the timber may still remain but the house no longer exists. With particles and antiparticles they really aren't destroyed, they just get changed into different particles when they collide, right?
There are believed to be just three conserved quantities whose densities must be specified in our recipe for the early universe:
1. Electric Charge. We can create or destroy pairs of particles with equal and opposite electric charge, but the net electric charge never changes. (We can be more certain about this conservation law than about any of the others, because if charge were not conserved, the accepted Maxwell theory of electricity and magnetism would make no sense.)
The word "destroy" really throws me off. When I think of destroy I think of complete elimination from existence, such as when you destroy a house it is completely gone, the timber may still remain but the house no longer exists. With particles and antiparticles they really aren't destroyed, they just get changed into different particles when they collide, right?