Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observational Evidence for Weak Gravitational Lensing by Large Scale
  Structure   A single very deep $10'$ field has been imaged to $r \sim 26$. There are 2682
galaxies with $23 \le r \le 26$ with a size significantly larger than the
seeing disk in the field. After correcting for telescope aberrations, possible
guiding errors, and signal degradation due to seeing, I find a polarization
signal of amplitude $|p|=2.7\%$, with an uncertainty of 1.2\% (95\% confidence
limit). For the 1773 galaxies with $23 \le r \le 25$, the measured amplitude is
2.4\% $\pm$ 1.2\% (95\% confidence limit). If this observed polarization is due
to gravitational lensing by large scale structure, cosmological inferences can
be made. The polarization amplitude would indicate that $\Omega_0 \times
\sigma_8 \approx 1$. The amplitude probability distribution is a Rayleigh
distribution with variance $\sigma_p^2$ so the probability $P(1/2 <
|p|/\sigma_p <2) = 75\%$, and $P(1/3 < |p|/\sigma_p < 3) = 93.5\%$. The
measurement of the polarization amplitude in a single field can be used to
constrain cosmological models since $\sigma_p \propto \Omega_0 \times
\sigma_8$.

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The categories of this paper are: eess
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph