Can a false vacuum form in a true vacuum?

While I was still researching on the Higgs I found out it is most likely that there is a true vacuum beneath the vacuum that we live in. Then I found this really old paper http://inspirehep.net/record/21273 that states if the vacuum energies are greater than zero gravitational effects make it possible for bubbles... show more While I was still researching on the Higgs I found out it is most likely that there is a true vacuum beneath the vacuum that we live in. Then I found this really old paper http://inspirehep.net/record/21273 that states if the vacuum energies are greater than zero gravitational effects make it possible for bubbles of a higher-energy ‘‘false vacuum’’ to nucleate and expand within a homogeneous region of a lower-energy ‘‘true vacuum.’’ Since false vacuum is the same as Metastable and we’re most likely in it , do you think what this theory is saying could actually possibly happen in our universe? Also if you think this would happen would it even affect our universe since it states the bubbles would form and expand in the true vacuum? It also states a mixture of all possible vacua in any initial evolved state in a de Sitter or de Sitter like space time, could that even happen in our universe? I’m interested to know what you think about this.
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