Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological susceptibility and fourth cumulant in a uniform magnetic
  field   We study the topological susceptibility and fourth cumulant of the QCD vacuum
in a background magnetic field using three-flavor chiral perturbation theory
($\chi$PT) for arbitrary quark masses and $n$-flavor $\chi$PT with degenerate
quark masses. We find that the enhancement of the topological susceptibility is
larger in the three-flavor $\chi$PT compared to two-flavor $\chi$PT.
Additionally, in comparing the fourth cumulant, we find that its suppression is
comparable for magnetic fields, $eH\lesssim 0.8m_{\pi}^{2}$, and weaker for
larger magnetic fields in three-flavor $\chi$PT with its enhancement beginning
at a significantly lower critical magnetic field compared to two-flavor
$\chi$PT. We also find that the enhancement of the topological susceptibility
in $n$-flavor $\chi$PT with degenerate quarks is significantly larger and the
suppression of the topological cumulant significantly greater at weak fields
with the critical magnetic field pushed out to larger magnetic fields compared
to both two and three-flavor $\chi$PT.

26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th