Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Approximating parabolas as natural bounds of Heisenberg spectra: Reply
  on the comment of O. Waldmann   O. Waldmann has shown that some spin systems, which fulfill the condition of
a weakly homogeneous coupling matrix, have a spectrum whose minimal or maximal
energies are rather poorly approximated by a quadratic dependence on the total
spin quantum number. We comment on this observation and provide the new
argument that, under certain conditions, the approximating parabolas appear as
natural bounds of the spectrum generated by spin coherent states.

14
The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
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The categories of this paper are: supr-con
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The categories of this paper are: eess
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math