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I discuss conceptual issues associated with the presence of metastable AdSvacua in the string landscape. The geometry of the decay from one AdS toanother is presented in detail, and various subtleties that are not present forflat or dS vacua are demonstrated and analyzed. I use mostly semiclassicalgravity, but I will consider the implications for recent attempts to constructfield theory duals of metastable AdS vacua and also possible relevance to thestudy of eternal inflation.

Metastability in Anti de Sitter Space