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   String theory

   String theory is a developing branch of quantum mechanics and general relativity with the aim of merging and reconciling the two areas of physics into a quantum theory of gravity. ... The original string theories from the 1980s describe special cases of M-theory where the eleventh dimension is a very small circle or a line, and if these formulations are considered as fundamental, then string theory requires ten dimensions.
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   Bosonic string theory

   Bosonic string theory is the original version of string theory, developed in the late 1960s. ... This would leave only the familiar four dimensions of spacetime visible.
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   String field theory

   String field theory (SFT) is a formalism in string theory in which the dynamics of relativistic strings is reformulated in the language of quantum field theory. ... In order to represent the vertex embedded in three dimensions, the propagators have been folded in half along their midpoints.
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   Heterotic string

   The mismatched 16 dimensions must be compactified on an even, self-dual lattice (a discrete subgroup of a linear space). ... String theory
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   Superstring theory

   Superstring theory is an attempt to explain all of the particles and fundamental forces of nature in one theory by modelling them as vibrations of tiny supersymmetric strings. ... This is the origin of needing 26 dimensions of space-time for bosonic string theory.
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   Topological string theory

   In theoretical physics, topological string theory is a simplified version of string theory. ... Perturbative A model calculations also count BPS states of spinning black holes in five dimensions.
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   Type I string theory

   In theoretical physics, type I string theory is one of five consistent supersymmetric string theories in ten dimensions. It is the only one whose strings are unoriented (both orientations of a string are equivalent) and which contains not only closed strings, but also open strings.
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   M-theory

   In theoretical physics, M-theory is an extension of string theory in which 11 dimensions are identified. Because the dimensionality exceeds the dimensionality of five superstring theories in 10 dimensions, it is believed that the 11-dimensional theory unites all string theories (and supersedes them).
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   Compactification (physics)

   In physics, compactification means changing a theory with respect to one of its space-time dimensions. ... A flux compactification is a particular way to deal with additional dimensions required by string theory.
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    Non-critical string theory

    The non-critical string theory describes the relativistic string without enforcing the critical dimension. ... While clearly not of phenomenological interest, string theories in two dimensions serve as important toy models.

Explore the following pages on Powerset:

• String theory,
• Bosonic string theory,
• String field theory,
• Heterotic string,
• Superstring theory,
• Topological string theory,
• Type I string theory,
• M-theory,
• Compactification (physics),
• Non-critical string theory

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