ar X iv : h ep - p h / 97 11 33 1 v 1 1 4 N ov 1 99 7 Stabilization of the Electroweak String by the Bosonic Zero Mode
نویسنده
چکیده
In the minimal standard model we discuss stability of the Z-string configuration, which includes the zero mode connected with the broken gauge symmetry. The zero mode induces charge and current on the string and gives backreaction to the string profile changing the region of dynamical stability. For sin 2 θ W = 0.23 it is found that the string is stabilized for the Higgs mass M H < 132 GeV in some finite range of the time-like currents. The Nielsen-Olesen vortex solution of the abelian Higgs model [1] can be embedded into the SU(2) L × U(1) Y electroweak theory [2] and this solution is known as the electroweak or Z-string. It could trigger baryogenesis at the electroweak phase transition [3] and manifest itself in accelerator experiments. However, there are no topological arguments for stability of such a string. The dynamical stability is reached outside of the physical region of the parameters [4, 5, 6]. Different attempts have been undertaken to save the Z-strings. It was shown that bound states on the string may improve its stability [7]. Fermion zero modes do not provide the backreaction to the string forming fields [8] leaving the string unstable. Stabilization is possible
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Type IIB string theory admits a BPS configuration in which three strings (of different type) meet at a point. Using this three string configuration we construct a string network and study its properties. In particular we prove supersymmetry of this configuration. We also consider string lattices, which can be used to construct BPS states in toroidally compactified string theory.
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Type IIB string theory admits a BPS configuration in which three strings (of different type) meet at a point. Using this three string configuration we construct a string network and study its properties. In particular we prove supersymmetry of this configuration. We also consider string lattices, which can be used to construct BPS states in toroidally compactified string theory.
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