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In quantum field theory, a false vacuum is a metastable sector of space that appears to be a perturbative vacuum but is unstable to instanton effects that may tunnel to a lower energy state. This tunneling can be caused by quantum fluctuations or the creation of high-energy particles. — “False vacuum - Wikipedia, the free encyclopedia”, en.wikipedia.org
The string theory landscape or anthropic landscape refers to the large number of possible false vacua in string theory. The "landscape" includes so many possible configurations that it is thought by some In string theory the number of false vacua is commonly quoted as 10500. The large. — “String theory landscape - Wikipedia, the free encyclopedia”, en.wikipedia.org