Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excited states by analytic continuation of TBA equations   We suggest an approach to the problem of finding integral equations for the
excited states of an integrable model, starting from the Thermodynamic Bethe
Ansatz equations for its ground state. The idea relies on analytic continuation
through complex values of the coupling constant, and an analysis of the
monodromies that the equations and their solutions undergo. For the scaling
Lee-Yang model, we find equations in this way for the one- and two- particle
states in the spin-zero sector, and suggest various generalisations. Numerical
results show excellent agreement with the truncated conformal space approach,
and we also treat some of the ultraviolet and infrared asymptotics
analytically.

6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga