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CMB-HD: An Ultra-Deep, High-Resolution Millimeter-Wave Survey Over Half the Sky

  • Aiola, Simone
  • Akrami, Yashar
  • Basu, Kaustuv
  • Boylan-Kolchin, Michael
  • Bryan, Sean
  • Clesse, Sebastien
  • Cyr-Racine, Francis-Yan
  • Di Mascolo, Luca
  • Dicker, Simon
  • Essinger-Hileman, Thomas
  • Ferraro, Simone
  • Fuller, George M.
  • Han, Dongwon
  • Hasselfield, Mathew
  • Holder, Gil
  • Jain, Bhuvnesh
  • Johnson, Bradley
  • Johnson, Matthew
  • Klaassen, Pamela
  • Madhavacheril, Mathew
  • And 20 more
Publication Date
Sep 04, 2019
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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.

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