The Accretion-Ejection Instability in X-ray Binaries
  The Accretion-Ejection Instability (AEI), which can occur in magnetized disks near equipartition, is a good candidate to explain the low-frequency QPO in black-hole binaries. Here we present analytical work concerning the behavior of QPO frequency and the emission of Alfv\'en waves from the disk to the corona. 
P. Varniere, M. Tagger (SAp CEA/Saclay France)