Towards the One-loop Kahler Metric of Calabi-Yau Orientifolds
  We evaluate string one-loop contributions to the Kahler metric of closed string moduli in toroidal minimally supersymmetric (Calabi-Yau) orientifolds with D-branes. We focus on the poorly understood N=1 sectors that receive contributions from all massive string states. 
Marcus Berg, Michael Haack, Jin U. Kang, Stefan Sjors
hep-th