  We study the impact of three-body forces on the response functions of cold
neutron matter. These response functions are determined in the random phase
approximation (RPA) from a residual interaction expressed in terms of Landau
parameters. Special attention is paid to the non-central part, including all
terms allowed by the relevant symmetries. Using Landau parameters derived from
realistic nuclear two- and three-body forces grounded in chiral effective field
theory, we find that the three-body term has a strong impact on the excited
states of the system and in the static and long-wavelength limit of the
response functions for which a new exact formula is established.
