Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational Lensing Characteristics of the Transparent Sun   The transparent Sun is modeled as a spherically symmetric and centrally
condensed gravitational lens using recent Standard Solar Model (SSM) data. The
Sun's minimum focal length is computed to a refined accuracy of 23.5 +/- 0.1
AU, just beyond the orbit of Uranus. The Sun creates a single image of a
distant point source visible to observers inside this minimum focal length and
to observers sufficiently removed from the line connecting the source through
the Sun's center. Regions of space are mapped where three images of a distant
point source are created, along with their associated magnifications. Solar
caustics, critical curves, and Einstein rings are computed and discussed.
Extremely high gravitational lens magnifications exist for observers situated
so that an angularly small, unlensed source appears near a three-image caustic.
Types of radiations that might undergo significant solar lens magnifications as
they can traverse the core of the Sun, including neutrinos and gravitational
radiation, are discussed.

24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci