Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological Lensing: Is the Matter Both Here and There?   If the Universe satisfies a perturbed Friedmann-Lema\^{\i}tre model, then the
bright matter (e.g. radio-loud active galactic nuclei, RLAGNs) may be
topologically lensed by global geometry. The generation of candidate
topological lensing pairs of RLAGNs, which may be double images of single
objects seen at very different celestial positions, provides very easily
falsifiable (given moderate telescope time) cosmological geometry hypotheses.

21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn