|All Roads Lead to String Theory (Polchinski)|
Prior to the First Superstring Revolution
|Early History|| S-Matrix Theory|
|Bosonic String Theory|| Worldsheet|
Bosonic String Theory
String Perturbation Theory
|Supersymmetric Revolution|| Supersymmetry|
|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|
Horava-Witten String Theory
N=4 Super-Yang-Mills Theory
BFSS Matrix Theory
Matrix String Theory
Twistor String Theory
String Field Theory
Pure Spinor Formalism
After the Revolutions
|Phenomenology|| String Theory Landscape|
Minimal Supersymmetric Standard Model
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Twistor String theory is an equivalence between $ \mathcal N=4 $ Supersymmetric Yang-Mills theory and the peturbative Topological B model string theory in twistor space]  It was initially proposed by Witten in 2003. This is considered a major breakthrough by many as till Witten's 2003 paper, Twistor theory was only applicable to Classical General Relativity. 
Since the dimensionality of Twistor space is necessarily the same as 4-dimensional spacetime with metric signature $ \left(-+++\right) $, i.e. 1 time and 3 space, this is also a way to do away with the extra dimensions of String Theory.
ReferencesEdit this section
- ↑ Witten, Edward (December 2003). "Perturbative Gauge Theory As A String Theory In Twistor Space:". Communications in Mathematical Physics. 1 252 (1): 189–258. doi:10.1007/s00220-004-1187-3. http://arxiv.org/pdf/hep-th/0312171v2.pdf. Retrieved 10 July 2013.
- ↑ Penrose, Roger; McCallum M.A.H. (9 June 1972). "Twistor Theory: An Approach to the Quantisation of Fields and Space-Time". Physics Reports (Section C of Physics Letters). 1972 6 (4): 241-316.