Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BPS Walls and Junctions in ${\cal N}=1$ SUSY Nonlinear Sigma Models   The ${\cal N}=1$ SUSY nonlinear sigma models in four spacetime dimensions are
studied to obtain BPS walls and junctions. A nonlinear sigma model with a
single chiral scalar superfield is found which has a moduli space of the
topology of $S^1$ and admits BPS walls and junctions connecting arbitrary
points in moduli space. New BPS junction solutions connecting $N$ discrete
vacua are also found for nonlinear sigma models with several chiral scalar
superfields. More detailed exposition of our results can be found in
Ref.\cite{NNS}.

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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn