Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CMB-HD: An Ultra-Deep, High-Resolution Millimeter-Wave Survey Over Half
  the Sky   A millimeter-wave survey over half the sky, that spans frequencies in the
range of 30 to 350 GHz, and that is both an order of magnitude deeper and of
higher-resolution than currently funded surveys would yield an enormous gain in
understanding of both fundamental physics and astrophysics. By providing such a
deep, high-resolution millimeter-wave survey (about 0.5 uK-arcmin noise and 15
arcsecond resolution at 150 GHz), CMB-HD will enable major advances. It will
allow 1) the use of gravitational lensing of the primordial microwave
background to map the distribution of matter on small scales (k~10/hMpc), which
probes dark matter particle properties. It will also allow 2) measurements of
the thermal and kinetic Sunyaev-Zel'dovich effects on small scales to map the
gas density and gas pressure profiles of halos over a wide field, which probes
galaxy evolution and cluster astrophysics. In addition, CMB-HD would allow us
to cross critical thresholds in fundamental physics: 3) ruling out or detecting
any new, light (< 0.1eV), thermal particles, which could potentially be the
dark matter, and 4) testing a wide class of multi-field models that could
explain an epoch of inflation in the early Universe. Such a survey would also
5) monitor the transient sky by mapping the full observing region every few
days, which opens a new window on gamma-ray bursts, novae, fast radio bursts,
and variable active galactic nuclei. Moreover, CMB-HD would 6) provide a census
of planets, dwarf planets, and asteroids in the outer Solar System, and 7)
enable the detection of exo-Oort clouds around other solar systems, shedding
light on planet formation. CMB-HD will deliver this survey in 5 years of
observing half the sky, using two new 30-meter-class off-axis cross-Dragone
telescopes to be located at Cerro Toco in the Atacama Desert. The telescopes
will field about 2.4 million detectors (600,000 pixels) in total.

26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
9
The categories of this paper are: nlin