Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Can a strong magnetic background modify the nature of the chiral
  transition in QCD?   The presence of a strong magnetic background can modify the nature and the
dynamics of the chiral phase transition at finite temperature: for high enough
magnetic fields, comparable to the ones expected to be created in noncentral
high-energy heavy ion collisions at RHIC and the LHC, the original crossover is
turned into a first-order transition. We illustrate this effect within the
linear sigma model with quarks to one loop in the ${\rm MS}$ scheme for
$N_{f}=2$.

26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics