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string theory landscape
The string theory landscape refers to the huge number of possible false vacua in string theory.〔The most commonly quoted number is of the order 10500. See M. Douglas, "The statistics of string / M theory vacua", ''JHEP'' 0305, 46 (2003). ; S. Ashok and M. Douglas, "Counting flux vacua", ''JHEP'' 0401, 060 (2004).〕 The large number of theoretically allowed configurations has prompted suggestions that certain physical mysteries, particularly relating to the fine-tuning of constants like the cosmological constant or the Higgs boson mass, may be explained not by a physical mechanism but by assuming that many different vacua are physically realized.〔L. Susskind, "The anthropic landscape of string theory", .〕 The ''anthropic landscape'' thus refers to the collection of those portions of the landscape that are suitable for supporting intelligent life, an application of the anthropic principle that selects a subset of the otherwise 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.
==Anthropic principle==
(詳細はanthropic principle, the idea that fundamental constants may have the values they have not for fundamental physical reasons, but rather because such values are necessary for life (and hence intelligent observers to measure the constants). In 1987, Steven Weinberg proposed that the observed value of the cosmological constant was so small because it is impossible for life to occur in a universe with a much larger cosmological constant.〔S. Weinberg, "Anthropic bound on the cosmological constant", ''Phys. Rev. Lett.'' 59, 2607 (1987).〕 In order to implement this idea in a concrete physical theory, it is necessary to postulate a multiverse in which fundamental physical parameters can take different values. This has been realized in the context of eternal inflation.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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