Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical Boundary Sine-Gordon Revisited   We revisit the exact solution of the two space-time dimensional quantum field
theory of a free massless boson with a periodic boundary interaction and
self-dual period. We analyze the model by using a mapping to free fermions with
a boundary mass term originally suggested in ref.[22]. We find that the entire
SL(2,C) family of boundary states of a single boson are boundary sine-Gordon
states and we derive a simple explicit expression for the boundary state in
fermion variables and as a function of sine-Gordon coupling constants. We use
this expression to compute the partition function. We observe that the solution
of the model has a strong-weak coupling generalization of T-duality. We then
examine a class of recently discovered conformal boundary states for compact
bosons with radii which are rational numbers times the self-dual radius. These
have simple expression in fermion variables. We postulate sine-Gordon-like
field theories with discrete gauge symmmetries for which they are the
appropriate boundary states.

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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph