Superstring Solitons and Conformal Field Theory
Theories with conventional superstring spectra can be generalized by allowing non-vanishing vacuum expectation values (vevs) for all the fields in the low energy supergravity, rather than for only the metric tensor. The vevs are given by classical solutions of the supergravity field equations. These solutions can be elementary in that they carry only Noether charge, or solitons which have topological charge. The bosonic supergravity fields, apart from the metric, are described by d-form potentials, which fall into two categories: they are either NS-NS or RR, the latter occurring only in Type II superstrings. These two types are distinguished by the d-forms representing massless states having their origin in the Neveu-Schwarz/Neveu-Schwarz or the Ramond/Ramond sector of the string theory.
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