Two types of quasiparticles excited in a Bose gas |
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Authors: | Minasyan V N Touryan K J |
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Institution: | Scientific Center of Applied Research, JINR, Dubna 141980, Russia. |
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Abstract: | 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. |
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