Definition of "worldsheet" [worldsheet]

• A two-dimensional manifold which describes the embedding of a string in spacetime, a direct generalization of the worldline of a particle in special and general relativity. (noun)

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• "The mechanism is completely different from the usual string paradigm: spacetime is not introduced ab initio as a target, but emerges as the space of degree 1 worldsheet instantons in the twistor space target."
• "The fact that it is consistent, in not really a big point in its favor, because all the consistency is really coming from the two dimensional conformal field theory of the worldsheet."
• "Afterwards it was discovered that the existence of fermions (something we see every day) required that the string worldsheet have supersymmetry."