Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective bosonic hamiltonian for excitons : a too naive concept   Excitons, being made of two fermions, may appear from far as bosons. Their
close-to-boson character is however quite tricky to handle properly. Using our
commutation technique especially designed to deal with interacting
close-to-boson particles, we here calculate the exact expansion in Coulomb
interaction of theexciton-exciton correlations, and show that a naive effective
bosonic hamiltonian for excitons cannot produce these X-X correlations
correctly.

19
The categories of this paper are: eess
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci