What is a false vacuum decay?
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All things want to be relaxed; not do anything. They don’t want to move or bounce or spin. They just want to sit still.
So if a ball is on top of a hill, it will roll down to a place where there is nowhere to roll anymore. When the ball rolls down, it’s called a decay. When there’s nowhere to roll anymore, some people call it a “vacuum”.
But imagine a great big hill and below that hill is a meadow. And below the meadow is another hill. Now think back to that ball rolling down the great big hill and imaging it stopped on the meadow. It’s in a state of vacuum decay because it stopped, but it’s a false state because there is still somewhere roll. Now if something happens to give it a push, it will roll down the second hill.
That’s why some people say that’s it’s in a vacuum decay which is false; it still has somewhere else to go, if only it got a push.
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