Inline videos. See also:Category: Articles with embedded Videos..

String field theory

From Biocrawler, the free encyclopedia.

Topics in String theory
Strings
open string > closed string > oriented string > world sheet \| nonlinear sigma model \| bosonic string theory > Nambu-Goto action > Polyakov action \| superstring theory > type I string > type II string >> type IIA string theory >> type IIB string theory > heterotic string \| M-theory > matrix theory > (simplified) \| F-theory \| string field theory \| matrix string theory \| first superstring revolution \| second superstring revolution \| tachyon condensation
Particles
graviton \| dilaton \| tachyon
Dualities
T-duality \| S-duality \| U-duality \| Mysterious duality
Branes
p-brane \| D-brane \| S-branes \| quiver diagram \| brane cosmology
Supersymmetry
supergravity \| superspace \| Lie superalgebra \| supergroup
Conformal field theory
Virasoro algebra \| mirror symmetry
Geometry
Kaluza-Klein theory > compact dimension > Why 10 dimensions? \| Calabi-Yau manifold \| Kähler manifold \| hyperKähler manifold > K3 surface \| G₂ manifold \| orbifold \| conifold \| orientifold \| moduli
Holography
holographic principle \| AdS/CFT \| black holes
Gauge theory
Chern-Simons form \| anomalies \| instantons \| Bogomol'nyi Prasad Sommerfield bound \| G₂, F₄, E₆, E₇, E₈ \| ADE classification \| Dirac string
People
Atiyah \|Banks \| Dijkgraaf \| Distler \| Douglas \| Fischler \| Green \|Greene \| Gross \| Harvey \| Horava \| Kaku \| Maldacena \| Minwalla \| Motl \| Polchinski \| Rajaraman \| Schwartz \| Seiberg \| Shenker \| Sen \| Strominger \| Susskind \| Vafa \| Veneziano \| Verlinde \| Verlinde \| Witten \| Hamed \|
See also
Topics in quantum theory <edit> (http://en.wikipedia.org/w/index.php?title=Template:String-theory&action=edit)

String field theory is a proposal to define string theory in such a way that the background independence is respected. String field theory can be understood as a quantum field theory with infinitely many fields which are unified into one master "string field". This string field, roughly speaking, assigns an operator to every one-dimensional curve (string) in spacetime, much like a quantum field assigns an operator to each zero-dimensional point in spacetime.

String field theory did not turn out to be helpful in the second superstring revolution because this revolution has revealed that other objects such as branes are as fundamental as the strings themselves. String field theory is based on the assumption that the strings are the fundamental objects, and it makes it more difficult (or impossible) to understand dualities within its framework.

There are several versions of string field theory - for example the boundary string field theory or the cubic (Chern-Simons-like) string field theory constructed by Edward Witten. In the late 1990s, both of them turned out to be very useful to understand tachyon condensation.

This physics article is a stub. You can help Biocrawler by expanding it (http://www.biocrawler.com/w/index.php?title=String_field_theory&action=edit).