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String theory landscape

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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 some physicists think that the known laws of physics, the standard model and general relativity with a positive cosmological constant, occur in at least one of them. The anthropic landscape refers to the collection of those portions of the landscape that are suitable for supporting human life, an application of the anthropic principle that selects a subset of the theoretically possible configurations.In string theory the number of false vacua is thought to be somewhere between 1010 to 10100. The large number of possibilities arises from different choices of Calabi–Yau manifolds and different values of generalized magnetic fluxes over different homology cycles. If one assumes that there is no structure in the space of vacua, the problem of finding one with a sufficiently small cosmological constant is NP complete, being a version of the subset sum problem.

Wikipedia Inglés http://en.wikipedia.org/wiki/String_theory_landscape

Wikipedia Español http://es.wikipedia.org/wiki/String_theory_landscape

Enlaces externos relacionado http://arxiv.org/abs/1009.5386 http://xstructure.inr.ac.ru/x-bin/theme2.py?arxiv=hep-th&level=1&index1=5460697