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  • Boson degeneracy and superfluidity of helium-4  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Goldstone excitation and symmetry-breaking mechanism in superfluid-He4 (1992)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 229-238 
    Details
    ISSN: 0392-6737
    Keywords: Boson degeneracy and superfluidity of helium-4 ; Quantum effects on the structure and dynamics of nondegenerate fluids (e.g., normal phase liquid helium-4) ; Other topics in thermal properties of condensed matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The form of Goldstone excitation in superfluid He4 is envisaged by the formalism of scaling transformation. This is achieved within the framework of symmetry-breaking mechanism which is akin to that of the relativistic quantum field theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457385
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  • 2
    Electronic Resource
    Electronic Resource
    Coherent state in the roton region of superfluid helium-4 (1992)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 221-228 
    Details
    ISSN: 0392-6737
    Keywords: Boson degeneracy and superfluidity of helium-4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Coherent states in the roton region of superfluid He4 are studied with a view to determine the transition probability from phonon to roton states. These states are formed in such a way that they are found to be identical to those of the angular-momentum states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457384
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  • 3
    Electronic Resource
    Electronic Resource
    Nucleation of vortices in superfluid helium-4 (1992)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 239-252 
    Details
    ISSN: 0392-6737
    Keywords: Boson degeneracy and superfluidity of helium-4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Nucleation of vortices and strings is studied in superfluid helium in the context of phase transitions in this system. It is shown that the formation of these structures depends on the homotopy groups of the manifold of degenerate condensed states. The subsequent evolution of these structures is investigated and then impact on the superfluid nature of this system is analysed. The cross-section for the scattering of quasi-particles is estimated. This is exploited to find the effect of scatterings on the dynamics of shrinking vortex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457386
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    Paper (German National Licenses)
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