Table of
String theory details by type and number of spacetime dimensions |
||
Type
|
Spacetime
dimensions
|
Details
|
Bosonic
|
26
|
Only bosons, no fermions,
meaning only forces, no matter, with both open and closed strings; major
flaw: a particle with
imaginary mass, called the tachyon,
representing an instability in the theory.
|
I
|
10
|
Supersymmetry between forces and matter, with both open
and closed strings; no tachyon; group symmetry is SO(32)
|
IIA
|
10
|
Supersymmetry between forces
and matter, with only closed strings bound to D-branes; no
tachyon; massless fermions are non-chiral
|
IIB
|
10
|
Supersymmetry between forces
and matter, with only closed strings bound to D-branes; no tachyon; massless
fermions are chiral
|
HO
|
10
|
Supersymmetry between forces
and matter, with closed strings only; no tachyon; heterotic, meaning right moving and left
moving strings differ; group symmetry is SO(32)
|
HE
|
10
|
Supersymmetry between forces
and matter, with closed strings only; no tachyon; heterotic; group symmetry
is E8×E8
|
Saturday, 1 June 2013
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