FORTHCOMING HIGH ENERGY PHYSICS SEMINARS: MONDAY, 29 JANUARY 2007, 15:30 p.m. LECTURE ROOM "C" - Main bldg. Filippo VERNIZZI (ICTP) "Nonlinear cosmological perturbations" THURSDAY, 1 FEBRUARY 2007, 15:30 p.m. LECTURE ROOM "C" - Main bldg. Alessandro MELCHIORRI (University 'La Sapienza' - Rome) "Dark energy in the Universe"