Results on the quasiparticle model for liquid He4 at finite temperatures

J. W. Halley, R. Hastings

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Within the interacting-quasiparticle model, we find several identities expressing the thermal energy H in terms of parameters entering the thermal-neutron scattering function S(q,ω) and an unknown interaction term. A new form for S(q,ω) at finite T is found which should be useful in analyzing neutron experiments. The only approximations are that the self-energies ij(q,ω) are independent of ω, and that the density ρq→ is linear in the boson operators αq→† and αq→ of the model.

Original languageEnglish (US)
Pages (from-to)1404-1414
Number of pages11
JournalPhysical Review B
Issue number3
StatePublished - 1977


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