Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gauge Field Production and Schwinger Reheating in Runaway Axion
  Inflation   In a class of (pseudoscalar) inflation, inflationary phase is followed by a
kination phase, where the Universe is dominated by the kinetic energy of the
inflaton that runs away in a vanishing scalar potential. In this class of
postinflationary evolution of the Universe, reheating of the Universe cannot be
achieved by the inflaton particle decay, which requires its coherent
oscillation in a quadratic potential. In this study, we explore the U(1) gauge
field production through the Chern-Simons coupling between the pseudoscalar
inflaton and the gauge field during the kination era and examine the subsequent
pair-particle production induced by the amplified gauge field known as the
Schwinger effect, which can lead to reheating of the Universe. We find that
with a rough estimate of the Schwinger effect for the Standard Model hyper U(1)
gauge field and subsequent thermalization of the pair-produced particles, a
successful reheating of the Universe can be achieved by their eventual
domination over the kinetic energy of the inflaton, with some reasonable
parameter sets. This can be understood as a concrete realization of the
"Schwinger reheating". Constraints from the later-time cosmology are also
discussed.

33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys