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  • 11.90.+t  (1)
  • 24.30  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Avoided resonance overlapping in many-channel scattering (1990)
    Springer
    The European physical journal 337 (1990), S. 243-245 
    Details
    ISSN: 1434-601X
    Keywords: 11.20 ; 24.10.Eq ; 24.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The behaviour of interfering resonances is studied within the framework of many-channelS-matrix theory. For the case of one open channel it is shown that at high level density where one naively would expect a strong overlapping, the resonances avoid each other: one resonance accumulates almost the whole sum of the widths of all resonances while the remaining ones become nearly stable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289688
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Connected Green function approach to symmetry breaking inΦ 1+1 4 -theory (1995)
    Springer
    The European physical journal 353 (1995), S. 301-310 
    Details
    ISSN: 1434-601X
    Keywords: 11.30.Qc ; 11.90.+t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the cluster expansions for n-point Green functions we derive a closed set of dynamical equations of motion for connected equal-time Green functions by neglecting all connected functions higher than 4 th order for theλΦ 4-theory in 1 + 1 dimensions. We apply the equations to the investigation of spontaneous symmetry breaking, i.e. to the evaluation of the effective potential at temperatureT=0. Within our momentum space discretization we obtain a second order phase transition (in agreement with the Simon-Griffith theorem) and a critical coupling ofλ crit /4m 2=2.446 as compared to a first order phase transition andλ crit /4m 2=2.568 from the Gaussian effective potential approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292336
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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