A very simple solution to the OPERA neutrino velocity problem
  Scientists from the OPERA experiment have measured neutrinos supposedly travelling at a velocity faster than light contrary to the theory of relativity. Even when the measurements are precise, the interpretation of this problem is being misunderstood. Here it is very easily solved and explained within the theory of relativity itself proving that neutrinos are not travelling faster than the speed of light and the early time arrival is due to the the presence of a gravitational field. 
J. Manuel Garcia-Islas
physics.gen-ph