Snowmass2021 CMB-HD White Paper
Abstract
CMB-HD is a proposed millimeter-wave survey over half the sky that would be ultra-deep (0.5 uK-arcmin) and have unprecedented resolution (15 arcseconds at 150 GHz). Such a survey would answer many outstanding questions about the fundamental physics of the Universe. Major advances would be 1.) the use of gravitational lensing of the primordial microwave background to map the distribution of matter on small scales (k~10 h Mpc^(-1)), 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 velocity, another probe of cosmic structure. In addition, CMB-HD would allow us to cross critical thresholds: 3.) ruling out or detecting any new, light (< 0.1 eV) particles that were in thermal equilibrium with known particles in the early Universe, 4.) testing a wide class of multi-field models that could explain an epoch of inflation in the early Universe, and 5.) ruling out or detecting inflationary magnetic fields. CMB-HD would also provide world-leading constraints on 6.) axion-like particles, 7.) cosmic birefringence, 8.) the sum of the neutrino masses, and 9.) the dark energy equation of state. The CMB-HD survey would be delivered in 7.5 years of observing 20,000 square degrees of sky, using two new 30-meter-class off-axis crossed Dragone telescopes to be located at Cerro Toco in the Atacama Desert. Each telescope would field 800,000 detectors (200,000 pixels), for a total of 1.6 million detectors.
Cite
@article{arxiv.2203.05728,
title = {Snowmass2021 CMB-HD White Paper},
author = {HD Collaboration and Simone Aiola and Yashar Akrami and Kaustuv Basu and Michael Boylan-Kolchin and Thejs Brinckmann and Sean Bryan and Caitlin M. Casey and Jens Chluba and Sebastien Clesse and Francis-Yan Cyr-Racine and Luca Di Mascolo and Simon Dicker and Thomas Essinger-Hileman and Gerrit S. Farren and Michael A. Fedderke and Simone Ferraro and George M. Fuller and Nicholas Galitzki and Vera Gluscevic and Daniel Grin and Dongwon Han and Matthew Hasselfield and Renee Hlozek and Gil Holder and Selim C. Hotinli and Bhuvnesh Jain and Bradley Johnson and Matthew Johnson and Pamela Klaassen and Amanda MacInnis and Mathew Madhavacheril and Sayan Mandal and Philip Mauskopf and Daan Meerburg and Joel Meyers and Vivian Miranda and Tony Mroczkowski and Suvodip Mukherjee and Moritz Munchmeyer and Julian Munoz and Sigurd Naess and Daisuke Nagai and Toshiya Namikawa and Laura Newburgh and Ho Nam Nguyen and Michael Niemack and Benjamin D. Oppenheimer and Elena Pierpaoli and Srinivasan Raghunathan and Emmanuel Schaan and Neelima Sehgal and Blake Sherwin and Sara M. Simon and Anze Slosar and Kendrick Smith and David Spergel and Eric R. Switzer and Pranjal Trivedi and Yu-Dai Tsai and Alexander van Engelen and Benjamin D. Wandelt and Edward J. Wollack and Kimmy Wu},
journal= {arXiv preprint arXiv:2203.05728},
year = {2022}
}
Comments
Contribution to Snowmass 2021. Note some text overlap with CMB-HD Astro2020 APC and RFI (arXiv:1906.10134, arXiv:2002.12714). Science case further broadened and updated