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  • 1
    Electronic Resource
    Electronic Resource
    Gaussian effective potential for theФ 4-theory in two dimensions at finite temperature (1992)
    Springer
    The European physical journal 53 (1992), S. 637-640 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Gaussian effective potential for the ground state of theФ 4-theory in 1+1 dimensions shows a symmetry breaking above a critical coupling constant. The restoration of the symmetry at high temperatures and the role of the renormalization are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01559741
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Damping of a Yukawa fermion at finite temperature (1995)
    Springer
    The European physical journal 66 (1995), S. 491-494 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The damping of a massless fermion coupled to a massless scalar particle at finite temperature is considered using the Braaten-Pisarski resummation technique. First the hard thermal loop diagrams of this theory are extracted and effective Green's functions are constructed. Using these effective Green's functions the damping rate of a soft Yukawa fermion is calculated. This rate provides the simplest example for the damping of a soft particle. To leading order it is proportional tog 2 T, whereas the one of a hard fermion is of higher order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01556376
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    Paper (German National Licenses)
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  • 3
    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
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The sub-Coulomb197Au(t, d)198Au reaction (1989)
    Springer
    The European physical journal 334 (1989), S. 293-297 
    Details
    ISSN: 1434-601X
    Keywords: 25.55.Fm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of a deformation of the triton due to a non-s part of the ground state wave function on triton induced reactions is investigated. For this purpose, a measurement of the absolute cross section of the197Au(t, d)198Au reaction below 7 MeV was performed and compared with a finite range DWBA calculation. Implications on reactions with tritons during the primordial nucleosynthesis are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284557
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    Paper (German National Licenses)
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