Neutrino mixing and cosmological constant
  We report on the recent result that the non--perturbative vacuum structure associated with neutrino mixing leads to a non--zero contribution to the value of the cosmological constant. Its value is estimated by using the natural cut--off appearing in the quantum field theory formalism for neutrino mixing. 
Massimo Blasone, Antonio Capolupo, Salvatore Capozziello, Sante   Carloni, Giuseppe Vitiello