A free string which sweeps a null surface (or worldsheet) in the Minkowski space time [1] (also tensionless string ). A null surface is a congruence of null curves in it, i.e. the curves which have the null (light-like) directions as tangent. Equivalently, a null worldsheet is a surface in spacetime which at every one of its points is tangent to the light-cone with vertex at that point [2]. Schild action describing strings and null string creates a basis to establish new connections between string model and matrix models of gauge fields (see [3] and Schild action ).
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Aoyama, H. et al. (2004). Null String. In: Duplij, S., Siegel, W., Bagger, J. (eds) Concise Encyclopedia of Supersymmetry. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4522-0_368
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