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  2. M-theory - Wikipedia

    en.wikipedia.org/wiki/M-theory

    In string theory, spacetime is ten-dimensional (nine spatial dimensions, and one time dimension), while in M-theory it is eleven-dimensional (ten spatial dimensions, and one time dimension). In order to describe real physical phenomena using these theories, one must therefore imagine scenarios in which these extra dimensions would not be ...

  3. String theory - Wikipedia

    en.wikipedia.org/wiki/String_theory

    String theory is a theoretical framework that attempts to address these questions. String theory arose as a response to mathematical limitations in standard quantum field theory. Field theory predicts physical phenomena with amazing accuracy but its mathematical underpinning are inconsistent and mysterious.

  4. Eleven-dimensional supergravity - Wikipedia

    en.wikipedia.org/wiki/Eleven-dimensional_super...

    Supergravity was discovered in 1976 through the construction of pure four-dimensional supergravity with one gravitino. One important direction in the supergravity program was to try to construct four-dimensional = supergravity since this was an attractive candidate for a theory of everything, stemming from the fact that it unifies particles of all physically admissible spins into a single ...

  5. Supergravity - Wikipedia

    en.wikipedia.org/wiki/Supergravity

    Due to string dualities, the conjectured 11-dimensional M-theory is required to have 11-dimensional supergravity as a "low energy limit". However, this doesn't necessarily mean that string theory/M-theory is the only possible UV completion of supergravity; [citation needed] supergravity research is useful independent of those relations.

  6. 11th dimension - Wikipedia

    en.wikipedia.org/wiki/11th_dimension

    11th dimension may refer to: 11-dimensional supergravity , a field theory that combines the principles of supersymmetry and general relativity. 11-dimensional spacetime, which appears in M-theory , a proposed "master theory" that unifies the five superstring theories

  7. Superstring theory - Wikipedia

    en.wikipedia.org/wiki/Superstring_theory

    In type I open string theory, the ends of open strings are always attached to D-brane surfaces. A string theory with more gauge fields such as SU(2) gauge fields would then correspond to the compactification of some higher-dimensional theory above 11 dimensions, which is not thought to be possible to date.

  8. Supermembranes - Wikipedia

    en.wikipedia.org/wiki/Supermembranes

    When going from the classical theory to the quantum theory of supermembranes it is found that they can only exist in 11 dimensions, just as superstrings can only exist in 10 dimensions. When examining the energy spectrum (the allowed frequencies that a string can vibrate in) it was found that they can only be in discrete values corresponding to ...

  9. Higher-dimensional supergravity - Wikipedia

    en.wikipedia.org/wiki/Higher-dimensional_super...

    Similarly the IIA branes descend from the 11-dimension branes and geometry. The IIA D0-brane is a Kaluza–Klein momentum mode along the compactified circle. The IIA fundamental string is an 11-dimensional membrane which wraps the compactified circle. The IIA D2-brane is an 11-dimensional membrane that does not wrap the compactified circle.