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There are five anomaly-free, perturbative superstring theories  . It is now widely believed that these theories represent special points in the moduli space of a more fundamental, non-perturbative theory known as M-theory , and so no particular string theory is necessarily more fundamental since they are all related by duality symmetries (for a review see, e.g., Ref. ). Moreover, another point of this moduli space corresponds to eleven-dimensional supergravity. This represents the low-energy limit of M-theory [337, 376] .
KeywordsModulus Space Equilibrium Point Cosmological Model Bianchi Type Dilaton Field
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