The Mass to Light ratio and the Initial Mass Function in galactic discs
  A low mass-to-light ratio for the baryonic component of spiral galaxies is advocated by a number of dynamical studies and by cosmological simulations of galaxy formation. We discuss the possibility of obtaining low mass-to-light ratios for the stellar component in discs, by changing the Initial Mass Function and the Star Formation History. 
L. Portinari, J. Sommer-Larsen and R. Tantalo