Pressure dependence of the roton spectrum in liquid helium

We suggest consistency checks on neutron scattering data on liquid helium under pressure. The theoretically calculated static structure functionS(k|P) leads to pressure dependence of the roton gap, momentum, and curvature in general agreement with experiment.Work supported in part by the U.S. Atomic Energy Commission, and in part by the National Science Foundation under Grant No. GP-29130 and through the Materials Research Center of Northwestern University.Resident Student Associate at Argonne National Laboratory, Summer 1972 and 1973.Alfred P. Sloan Research Fellow.