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.
Killing Spinors for the Bosonic String and the Kaluza-Klein Theory with Scalar Potentials
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The paper consists mainly of two parts. In the first part, we obtain well-defined Killing spinor equations for the low-energy effective action of the bosonic string with the conformal anomaly term. We show that the conformal anomaly term is the only scalar potential that one can add into the action that is consistent with the Killing spinor equations. In the second part, we demonstrate that the Kaluza-Klein theory can be gauged so that the Killing spinors are charged under the Kaluza-Klein vector. This gauging process generates a scalar potential with a maximum that gives rise to an AdS spacetime. We also construct solutions of these theories.
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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.