Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatial Distribution of Pair Production over the Pulsar Polar Cap   Using an analytic, axisymmetric approach that includes general relativity,
coupled to a condition for pair production deduced from simulations, we derive
general results about the spatial distribution of pair-producing field lines
over the pulsar polar cap. In particular, we show that pair production on
magnetic field lines operates over only a fraction of the polar cap for an
aligned rotator for general magnetic field configurations, assuming the
magnetic field varies spatially on a scale that is larger than the size of the
polar cap. We compare our result to force-free simulations of a pulsar with a
dipole surface field and find excellent agreement. Our work has implications
for first-principles simulations of pulsar magnetospheres, and for explaining
observations of pulsed radio and high-energy emission.

22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio