S-brane

In string theory, an S-brane is a hypothetical and controversial counterpart of the D-brane, which is localized in time. Depending on the context the "S" stands for "Strominger", "Sen", or "Space-like". The S-brane was originally proposed by Andrew Strominger in his speculative paper, and another version of S-branes was studied by Ashoke Sen. They are thought to be extended in the space-like/temporal directions only, so that they exist at only one point in time, but are otherwise analogous to p-branes.

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String theory

Background

Strings
Cosmic strings
History of string theory
- First superstring revolution
- Second superstring revolution
String theory landscape

Theory

Nambu–Goto action
Polyakov action
Bosonic string theory
Superstring theory
- Type I string
- Type II string
  - Type IIA string
  - Type IIB string
- Heterotic string
N=2 superstring
F-theory
String field theory
Matrix string theory
Non-critical string theory
Non-linear sigma model
Tachyon condensation
RNS formalism
GS formalism

Particles and fields

Conformal field theory

Anomalies
Instantons
Chern–Simons form
Bogomol'nyi–Prasad–Sommerfield bound
Exceptional Lie groups (G₂, F₄, E₆, E₇, E₈)
ADE classification
Dirac string
p-form electrodynamics

Geometry

Worldsheet
Kaluza–Klein theory
Compactification
Why 10 dimensions?
Kähler manifold
Ricci-flat manifold
- Calabi–Yau manifold
- Hyperkähler manifold
  - K3 surface
- G₂ manifold
- Spin(7)-manifold
Generalized complex manifold
Orbifold
Conifold
Orientifold
Moduli space
Hořava–Witten theory
K-theory (physics)
Twisted K-theory

Matrix theory
Introduction to M-theory

String theorists

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