Q-instantons

Understand

We construct the half-supersymmetric instanton solutions that are electric-magnetically dual to the recently discussed half-supersymmetric Q7-branes.

• We call these instantons `Q-instantons'.
• Whereas the D-instanton is most conveniently described using the RR axion \chi and the dilaton \phi, the Q-instanton is most conveniently described using a different set of fields \chi' and T, where \chi' is an axionic scalar.
• The real part of the Q-instanton on-shell action is a function of T and the imaginary part is linear in \chi'.