Cohomologie $L^p$ en degr\'e 1 des espaces homog\`enes
  The $L^p$-cohomology in degree 1 of Riemannian homogeneous spaces is computed. It turns out that reduced cohomology does not vanish exactly for spaces quasiisometric to negatively curved homogeneous spaces. 
Pierre Pansu (LM-Orsay)
math.DG