Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing Strong Correlations with Light Scattering: the Example of the
  Quantum Ising model   In this paper we calculate the nonlinear susceptibility and the resonant
Raman cross section for the paramagnetic phase of the ferromagnetic Quantum
Ising model in one dimension. In this region the spectrum of the Ising model
has a gap $m$. The Raman cross section has a strong singularity when the energy
of the outgoing photon is at the spectral gap $\omega_{f} \approx m$ and a
square root threshold when the frequency difference between the incident and
outgoing photons $\omega_{i} -\omega_{f} \approx 2m$. The latter feature
reflects the fermionic nature of the Ising model excitations.

17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int