[SEMINARI]: Dr. Tonnis ter Veldhuis: Where the walls meet: supersymmetric domain wall junctions

[Arcadi Santamaria]

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                              S E M I N A R I

        [Image]        Departament de Física Teòrica         [Image]
                  Universitat de València - IFIC (UV-CSIC)
                      46100 Burjassot (València) Spain

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            Where the walls meet: supersymmetric domain wall junctions

                             Tonnis ter Veldhuis

 (Theoretical Physics Institute, University of Minnesota, 55455 Minneapolis)

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                     Aula de Seminaris de Física Teòrica
                   Tuesday 20 of June of 2000 at 12:00 AM
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                                    Resum

      It is quite common to find a discrete set of degenerate vacua in
 supersymmetric theories. Such vacua may be interpolated by domain walls. If
  a domain wall breaks only half of supersymmetry spontaneously, it is BPS
    saturated. Recently, it was discovered that BPS saturated domain wall
 junctions, which preserve 1/4 of supersymmetry, also exist in some models.
In this talk, I will discuss various topics concerning domain wall junctions
    in the context of simple generalized Wess-Zumino models: the central
   extension of the supersymmetry algebra, the calculation of the junction
tension, and the issue of BPS saturation. I will also discuss the equivalent
 of the walls and junctions in d=1+1 dimensional models with a compact space
        dimension, where they correspond to solitons and instantons.

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