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  • Cosmic strings stabilized by fermion fluctuations 

    Weigel H.; Quandt M.; Graham N. (2012)
    We provide a thorough exposition of recent results on the quantum stabilization of cosmic strings. Stabilization occurs through the coupling to a heavy fermion doublet in a reduced version of the standard model. The study ...

  • Fermion energies in the background of a cosmic string 

    Graham N.; Quandt M.; Weigel H. (2011)
    We provide a thorough exposition, including technical and numerical details, of previously published results on the quantum stabilization of cosmic strings. Stabilization occurs through the coupling to a heavy fermion ...

  • Gauge invariance and vacuum energies of non-Abelian string-configurations 

    Weigel H.; Quandt M. (2010)
    We improve on a method to compute the fermion contribution to the vacuum polarization energy of string-like configurations in a non-Abelian gauge theory. We establish the new method by numerically verifying the invariance ...

  • Stable charged cosmic strings 

    Weigel H.; Quandt M.; Graham N. (2011)
    We study the quantum stabilization of a cosmic string by a heavy fermion doublet in a reduced version of the standard model. We show that charged strings, obtained by populating fermionic bound state levels, become stable ...