878 research outputs found
Dynamical Symmetry Breaking in SYM Theories as a Non-Semiclassical Effect
We study supersymmetry breaking effects in N=1 SYM from the point of view of
quantum effective actions. Restrictions on the geometry of the effective
potential from superspace are known to be problematic in quantum effective
actions, where explicit supersymmetry breaking can and must be studied. On the
other hand the true ground state can be determined from this effective action,
only. We study whether some parts of superspace geometry are still relevant for
the effective potential and discuss whether the ground states found this way
justify a low energy approximation based on this geometry. The answer to both
questions is negative: Essentially non-semiclassical effects change the
behavior of the auxiliary fields completely and demand for a new interpretation
of superspace geometry. These non-semiclassical effects can break
supersymmetry.Comment: 37 pages, LaTex. Version 3: many important changes, extended
discussion of the topi
Generalized complex geometry and the Poisson Sigma Model
The supersymmetric Poisson Sigma model is studied as a possible worldsheet
realization of generalized complex geometry. Generalized complex structures
alone do not guarantee non-manifest N=(2,1) or N=(2,2) supersymmetry, but a
certain relation among the different Poisson structures is needed. Moreover,
important relations of an additional almost complex structure are found, which
have no immediate interpretation in terms of generalized complex structures.Comment: 13 pages, LaTeX. v2: references added, typos, v3: more typos,
references updated, final versio
Black holes as boundaries in 2D dilaton supergravity
We discuss 2D dilaton supergravity in the presence of boundaries. Generic
ones lead to results different from black hole horizon boundaries. In
particular, the respective numbers of physical degrees of freedom differ, thus
generalizing the bosonic results of hep-th/0512230.Comment: 6 pages; to appear in the proceedings of the Eleventh Marcel Grossman
Meetin
Two-Dimensional N=(2,2) Dilaton Supergravity from Graded Poisson-Sigma Models II: Analytic Solution and BPS States
The integrability of N=(2,2) dilaton supergravity in two dimensions is
studied by the use of the graded Poisson Sigma model approach. Though important
differences compared to the purely bosonic models are found, the general
analytic solutions are obtained. The latter include minimally gauged models as
well as an ungauged version. BPS solutions are an especially interesting
subclass.Comment: 23 p LaTe
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