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The String Theory Landscape
Stephen Weinberg in the 1980s had pointed out that the cosmological constant was a right target for this kind of reasoning. With inflationary cosmology plus string theory landscape, you can very easily make a multiverse with different values from place to place. Even if string theory isn't true, I personally think are extremely likely to ultimately find a place in our theory of quantum gravity. These include ideas of holography, black hole complementarity and how to get information out of black holes as they evaporate away.