Thickening the string. II. The null-string dust

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Abstract
The bivector field approach previously applied to a perfect dust of timelike strings is applied to a dust of null strings. The conservation law for the null-string-dust stress-energy tensor is used to prove that each null-string world sheet is ruled by a family of null geodesics. A vector conservation law for the null-string dust is derived. It is also demonstrated that, with proper normalization of the null-string bivector, the bivector form of the equations of motion for the timelike string also holds for the null string.

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