Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On gravito-magnetic time delay by extended lenses   Gravitational lensing by rotating extended deflectors is discussed. Due to
spin, corrections on image positions, caustics and critical curves can be
significant. In order to obtain realistic quantitative estimates, the lens is
modeled as a singular isothermal sphere. Gravito-magnetic time delays of nearly
0.2 days between different images of background sources can occur.

7
The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn