Two types of quasiparticles excited in a Bose gas.
We present a novel approach for investigating the superfluid liquid 4He based on the proper use of the nonideal Bose gas model for dilute hard spheres. The results show that the presence of a macroscopic number of condensate atoms leads to the existence of a nonphysical branch, corresponding to density excitations, in addition to the continuous branch of the phonon-maxon-roton excitation spectrum.
Minasyan
V N
VN
Scientific Center of Applied Research, JINR, Dubna 141980, Russia.
Touryan
K J
KJ