Three-phonon vertex corrections to the excitation spectrum and liquid-structure function of liquid 4He
Journal Article
·
· Journal of Low Temperature Physics
The energy spectrum of elementary excitations and the liquidstructure function of liquid 4He are calculated by means of the method of correlated basis functions in the approximation of second-order perturbation theory. The procedure is based on (i) the construction of phonon functions in terms of collective coordinates and the optimum Bijl--Dingle--Jastrow type of groundstate wave function and (ii) the evaluation of leading correction terms to the Bijl-- Feynman excitation spectrum, which are generated by two types of three-phonon vertices. Numerical results are obtained using the optimum liquid-structure function computed by Campbell and Feenberg in the paired-phonon analysis.
- Research Organization:
- Univ. of Kansas, Lawrence
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-29-001512
- OSTI ID:
- 4416641
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 12; ISSN 0022-2291
- Publisher:
- Plenum Press
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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