Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weak lensing with 21cm intensity mapping at $z \sim 2-3$   We study how 21 cm intensity mapping can be used to measure gravitational
lensing over a wide range of redshift. This can extend weak lensing
measurements to higher redshifts than are accessible with conventional galaxy
surveys. We construct a convergence estimator taking into account the
discreteness of galaxies and calculate the expected noise level as a function
of redshift and telescope parameters. At $z \sim 2-3$ we find that a telescope
array with a collecting area $\sim 0.2 \, {\rm km}^2$ spread over a region with
diameter $\sim 2 \, {\rm km}$ would be sufficient to measure the convergence
power spectrum to high accuracy for multipoles between 10 and 1,000. We show
that these measurements can be used to constrain interacting dark energy
models.

23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
19
The categories of this paper are: eess