Saturday 21 December 2019

quantum field theory - Virtual Particles real? Virtual particles create a universe?


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:




  1. Is the vacuum empty or is it not?





  2. Are there particles in the vacuum and can they create a universe?




  3. But when virtual particles are just a mathemacical "trick" to calculate something, what does Lawrence Krauss mean?




  4. What is the matter about the vacuum?






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