I am reading the book of Lawrence Krauss "A universe out of nothing", where he explained that the vacuum is not empty. It is a boiling brew of virtual particles that come out of their existence. And they can create a universe, even space.
But virtual particles are inner lines in a feynman-diagram. They converge in a vertex and so on. They are off-Shell.
I am a layman and I cannot grasp clearly about this stuff.
My question are:
Is the vacuum empty or is it not?
Are there particles in the vacuum and can they create a universe?
But when virtual particles are just a mathemacical "trick" to calculate something, what does Lawrence Krauss mean?
What is the matter about the vacuum?
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