New BPS NS(-1)-branes in N=1, D=4 supergravity are supported by SU(2)xSU(2) instantons; the string-frame topology changes with instanton moduli while the 3-form charge stays fixed.
New BPS States from Bosonic/Heterotic Duality
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In this paper, we consider the recently proposed bosonic/heterotic duality that relates the heterotic superstrings to the noncritical bosonic string. Although the latter is nonsupersymmetric, it can be viewed as pseudo-supersymmetric in that the theory admits a consistent set of Killing spinor equations whose integrability conditions are satisfied by the equations of motion. We construct two classes of the dual pairs of BPS and pseudo-BPS solutions in the respective heterotic and bosonic strings and obtain their explicit Killing spinors. The existence of such dual pairs lends support to the proposed duality.
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Instanton Moduli, Topology and the Bosonic/Heterotic String Origins
New BPS NS(-1)-branes in N=1, D=4 supergravity are supported by SU(2)xSU(2) instantons; the string-frame topology changes with instanton moduli while the 3-form charge stays fixed.