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String Theory
Stringinteractions
All Roads Lead to String Theory (Polchinski)
Prior to the First Superstring Revolution
Early History S-Matrix Theory
Regge Trajectory
Bosonic String Theory Worldsheet
String
Bosonic String Theory
String Perturbation Theory
Tachyon Condensation
Supersymmetric Revolution Supersymmetry
RNS Formalism
GS Formalism
BPS
Superstring Revolutions
First Superstring Revolution GSO Projection
Type II String Theory
Type IIB String Theory
Type IIA String Theory
Type I String Theory
Type H String Theory
Type HO String Theory
Type HE String Theory
Second Superstring Revolution T-Duality
D-Brane
S-Duality
Horava-Witten String Theory
M-Theory
Holographic Principle
N=4 Super-Yang-Mills Theory
AdS CFT
BFSS Matrix Theory
Matrix String Theory
(2,0) Theory
Twistor String Theory
F-Theory
String Field Theory
Pure Spinor Formalism
After the Revolutions
Phenomenology String Theory Landscape
Minimal Supersymmetric Standard Model
String Phenomenology


Supersymmetry (SUSY) A postulated symmetry between bosonic and fermionic fields in Quantum Field Theoryies and String Theoryies.

The theory of Supsersymmetry has been incorporated in the Standard Model (MSSM), Yang-Mills Theory (Super-Yang-Mills Theory), and most famously String Theory (Superstring theory).

While Supersymmetry remains experimentally unconfirmed, one of its greatest achievements is that the MSSM (which also appears in realistic M-Theory vacua) predicts a Higgs of mass 125 GeV (which was measured by the LHC recently.), which is contrary to the Standard Model, which predicts such a mass to be rather unlikely.

Technical detailsEdit this section

There are two types of supersymmetry; worldsheet supersymmetry, and spacetime supersymmetry.

Worldsheet supersymmetryEdit this section

The RNS Formalism has explicit worldsheet supersymmetry. Since the RNS Action is given by adding the Polyakov Action to the Dirac Action, it is given by:

{{\mathsf{\mathcal{L}}}_ {RNS}}=\frac{T}{2} h^{\alpha \beta} \left(  \partial_\alpha X^\mu \partial_\beta X^\nu +i\hbar c_0 \bar{\psi_\mu} \not{\partial} \psi^\mu   \right) g_{\mu\nu}

The supersymmetryic transformations on the worldsheet can therefore be (almost trivially, by taking variations of this above action) shown to be:

   \begin{align}
  \delta {X^\mu } \to \bar \epsilon  {\psi ^\mu } ;         \\
  \delta {\psi ^\mu } \to  - i              \not \partial {X^\mu }\epsilon          \\ 
\end{align}

Spacetime SupersymmetryEdit this section

The GS Formalism, or the Superspace Formalism, are with explicit spacetime supersymmetry. The supersymmetryic transformations on spacetime are (which is rather intuitive if you compare this to the RNS Worldsheet supersymmetry transformations) given by:

  \begin{align}
  \delta {\Theta ^{Aa}} \leftrightarrow {\varepsilon ^{Aa}} ;       \\
  \delta {X^\mu } \leftrightarrow {{\bar \varepsilon }^A}{\gamma ^\mu }{\Theta ^A}             \\ 
\end{align}

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