Swampland

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This page is about the concept of a swampland in string theory. For the type of wetland see swamp.

Recent developments in string theory suggest that the string theory landscape of vacua is vast. It is natural to ask if this landscape is as vast as allowed by consistent-looking effective field theories. Some authors suggest that this is not the case, and that the landscape is surrounded by an even more vast swampland of consistent-looking semiclassical effective field theories, which are actually inconsistent.

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