Finding:

1. close

   String theory

   Flat space string theories are 26-dimensional in the bosonic case, while superstring and M-theories turn out to involve 10 or 11 dimensions for flat solutions. ... | Theory |
2. close

   Superstring theory

   Further information: string theory ... Our minds have difficulty visualizing higher dimensions because we can only move in three spatial dimensions.
3. close

   Topological string theory

   A-model topological string theory amplitudes are used to compute prepotentials in N=2 supersymmetric gauge theories in four and five dimensions. ... String theory
4. close

   Supergravity

   There is a single Majorana-Weyl spinor of supercharges, which in 10 dimensions contains 16 supercharges. ... String theory
5. close

   M-theory

   This theory is the unique supersymmetric theory in eleven dimensions, with its low-energy matter content and interactions fully determined. ... String theory
6. close

   D-brane

   Because string theory implies that the Universe has more dimensions than we expect—26 for bosonic string theories and 10 for superstring theories—we have to find a reason why the extra dimensions are not apparent. ... In order to maintain the second law of thermodynamics, one must postulate that the black hole gained whatever entropy the infalling gas originally had.
7. close

   Euclidean geometry

   Postulates 3 and 5 hold only for plane geometry; in three dimensions, postulate 3 defines a sphere. ... Many physicists expect some Euclidean string theory to eventually become the Theory Of Everything, but their view is by no means unanimous, and in any case the future of this issue is unpredictable.
8. close

   Bosonic string theory

   So bosonic string theory predicts a 26 dimensional spacetime. ... This would leave only the familiar four dimensions of spacetime visible.
9. close

   Type I string theory

   In theoretical physics, type I string theory is one of five consistent supersymmetric string theories in ten dimensions.
10. close

    Theory of everything

    String theories and supergravity (both believed to be limiting cases of the yet-to-be-defined M-theory) suppose that the universe actually has more dimensions than the easily observed three of space and one of time. ... String theory

Explore the following pages on Powerset:

• String theory,
• Superstring theory,
• Topological string theory,
• Supergravity,
• M-theory,
• D-brane,
• Euclidean geometry,
• Bosonic string theory,
• Type I string theory,
• Theory of everything