CMB-HD: An Ultra-Deep, High-Resolution Millimeter-Wave Survey Over Half the Sky
Creators: name: Sehgal, Neelima
name: Aiola, Simone
name: Akrami, Yashar
name: Basu, Kaustuv
name: Boylan-Kolchin, Michael
name: Bryan, Sean
name: Clesse, Sebastien
name: Cyr-Racine, Francis-Yan
name: Di Mascolo, Luca
name: Dicker, Simon
name: Essinger-Hileman, Thomas
name: Ferraro, Simone
name: Fuller, George M.
name: Han, Dongwon
name: Hasselfield, Mathew
name: Holder, Gil
name: Jain, Bhuvnesh
name: Johnson, Bradley
name: Johnson, Matthew
name: Klaassen, Pamela
name: Madhavacheril, Mathew
name: Mauskopf, Philip
name: Meerburg, Daan
name: Meyers, Joel
name: Mroczkowski, Tony
name: Munchmeyer, Moritz
name: Naess, Sigurd
name: Nagai, Daisuke
name: Namikawa, Toshiya
name: Newburgh, Laura
name: Nguyen, Ho Nam
name: Niemack, Michael
name: Oppenheimer, Benjamin D.
name: Pierpaoli, Elena
name: Schaan, Emmanuel
name: Slosar, Anze
name: Spergel, David
name: Switzer, Eric
name: van Engelen, Alexander
name: Wollack, Edward
Publisher: name: arXiv
Year: 2019
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 (&lt; 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.
description: APC White Paper for the Astro2020 Decadal, with updated proposing team