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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 1679-1691 
    ISSN: 0392-6737
    Keywords: Quantum statistical theory ; ground state, elementary excitations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto L'equazione integrale HNC modificata è applicata allo studio dello stato fondamentale di un fluido di Bose nell'approssimazione di Jastrow per diverse espressioni della interazione binaria e forme diverse della correlazione di Jastrow. In tutti i casi l'energia per4He è calcolata con un errore non superiore a 0.1 K a tutte le densità. Si considera inoltre l'effetto di una correlazione a tre corpi nella funzione d'onda.
    Abstract: Резюме модифицированное уравнение цепочки используется для исследования основного состояния Ъозе-жидкости в приближении Ястрова. Мы проверяем уравнение для различных форм парного взаимодействия и псевдопотенциала Ястрова. Во всех случаях приводится энергия4He с погрешностью не более, чем 0.1 K для всех плотностей. Также исследуется влияине триплетного члена на волновую функцию.
    Notes: Summary The modified hypernetted-chain equation is used to study the ground state of Bose fluids in the Jastrow approximation. We test the equation for different forms of the pair interaction and of the Jastrow pseudopotential and in all cases the energy of4He is given with an error not larger than 0.1 K at all densities. The effect of a triplet term in the wavefunction is also studied.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 93 (1993), S. 879-892 
    ISSN: 1573-7357
    Keywords: 67.40 ; 02.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The excitation spectrum of superfluid 4 He is discussed on the basis of a shadow wave function. The potential and kinetic energies of the excitations are computed at different densities. The theory has been extended at finite temperature and we obtain the roton contribution to the radial distribution function, to the depletion of the condensate and to the dynamical structure factor S(q,ω). We present also the first realistic microscopic computation of the roton energy at finite T. Possible role of thermally excited vortices on rotons is considered. With a simple model we show that some discrepancies between the linewidth of the roton response in neutron and in Raman scattering can be resolved.
    Type of Medium: Electronic Resource
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