Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large-N scaling behavior of the ground-state energy and fidelity in the
  Dicke Model   Within the numerically exact solution to the Dicke model proposed previously,
we study the quantum criticality in terms of the ground-state (GS) energy,
fidelity, and the order parameter. The finite size scaling analysis for the
average fidelity susceptibility (FS) and second derivative of GS energy are
performed. The correlation length exponent is obtained to be $\nu=2/3$, which
is the same as that in Lipkin-Meshkov-Glick model obtained previously,
suggesting the same universality. It is observed that average FS and second
derivative of GS energy show similar critical behavior, demonstrating the
intrinsic relation in the Dicke model. The scaling behavior for the order
parameter and the singular part of the GS energy at the critical point are also
analyzed and the obtained exponents are consistent with the previous scaling
hypothesis in 1/N expansion scheme.

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The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
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The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th