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  • 04.20.Gz  (2)
  • 67.57.Fg  (2)
  • 67.40.−w  (1)
  • 1995-1999  (5)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Rotational quantum friction in superfluids: Radiation from object rotating in superfluid vacuum (1999)
    Springer
    JETP letters 69 (1999), S. 281-287 
    Details
    ISSN: 1090-6487
    Keywords: 03.65.−w ; 67.40.−w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The friction experienced by a body rotating in a superfluid liquid at T=0 is discussed. The effect is analogous to the amplification of electromagnetic radiation and spontaneous emission by a body or black hole rotating in the quantum vacuum, first discussed by Zel’dovich and Starobinsky. The friction is caused by the interaction of the part of the liquid which is rigidly connected with the rotating body and thus represents a comoving detector, with the “Minkowski” superfluid vacuum outside the body. The emission process is the quantum tunneling of quasiparticles from the detector to the ergoregion, where the energy of quasiparticles is negative in the rotating frame. This quantum rotational friction caused by the emission of quasiparticles is estimated for phonons and rotons in superfluid 4He and for Bogoliubov fermions in superfluid 3He.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568024
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  • 2
    Electronic Resource
    Electronic Resource
    On phase ordering behind the propagating front of a second-order transition (1997)
    Springer
    JETP letters 65 (1997), S. 102-107 
    Details
    ISSN: 1090-6487
    Keywords: 11.27.+d ; 67.40.Vs ; 67.57.Fg ; 98.80.Cq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In a real system the heating is nonuniform, and a second-order phase transition to a broken-symmetry phase occurs by propagation of a temperature front. Two parameters, the cooling rate τ Q and the transition front velocity ν T determine the nucleation of topological defects. Depending on the relation of these parameters, two regimes are found: in the regime of fast propagation defects are created according to the Zurek scenario for the homogeneous case, while in the slow-propagation regime vortex formation is suppressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567332
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  • 3
    Electronic Resource
    Electronic Resource
    From effective BCS action to vortex dynamics (1997)
    Springer
    JETP letters 65 (1997), S. 676-682 
    Details
    ISSN: 1090-6487
    Keywords: 11.27.+d ; 67.57.Fg ; 74.20.Fg ; 74.60.−w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The topological term in the effective action for the electrically neutral BCS system is discussed. It is applied for the calculation of the transverse force acting on a vortex in the limit of a smooth vortex core and vanishing interlevel distance in the vortex core. The controversy between the topological terms in the articles by I. J. R. Aitchison et al., Phys. Rev. B 51, 6531 (1995) and A. van Otterlo et al., cond-mat/9703124 is resolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567405
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  • 4
    Electronic Resource
    Electronic Resource
    Vierbein walls in condensed matter (1999)
    Springer
    JETP letters 70 (1999), S. 711-716 
    Details
    ISSN: 1090-6487
    Keywords: 67.57.−z ; 74.20.−z ; 04.20.Gz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effective field, which plays the part of the vierbein in general relativity, can have topologically stable surfaces, vierbein domain walls, at which the effective contravariant metric is degenerate. We consider vierbein walls separating domains with flat spacetime which are not causally connected at the classical level. The possibility of a quantum mechanical connection between the domains is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568251
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  • 5
    Electronic Resource
    Electronic Resource
    Effective spacetime and Hawking radiation from a moving domain wall in a thin film of 3He-A (1998)
    Springer
    JETP letters 68 (1998), S. 874-880 
    Details
    ISSN: 1090-6487
    Keywords: 67.57.−z ; 04.20.Gz ; 67.70.+n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An event horizon for “relativistic” fermionic quasiparticles can be constructed in a thin film of superfluid 3He-A. The quasiparticles see an effective “gravitational” field which is induced by a topological soliton of the order parameter. Within the soliton the “speed of light” crosses zero and changes sign. When the soliton moves, two planar event horizons (black hole and white hole) appear, with a curvature singularity between them. Aside from the singularity, the effective spacetime is incomplete at future and past boundaries, but the quasiparticles cannot escape there because the nonrelativistic corrections become important as the blueshift grows, yielding “superluminal” trajectories. The question of Hawking radiation from the moving soliton is discussed but not resolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567808
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