The Atacama Large Aperture Submm Telescope (AtLAST): Cosmological and Sunyaev-Zeldovich Effect Applications

Being observable from the ground, new instruments for studying the SZ effects can be developed more rapidly and can be upgraded more readily than their space-borne counterparts. I will discuss recent results from ALMA and MUSTANG2, as well as a newly-proposed research infrastructure (recently approved by the European Commission as a Design Study) for a 50-meter-class widefield submm/mm telescope called AtLAST. AtLAST will be capable of observing the multifaceted SZ effects and disentangling them from contaminating radio and dusty submm sources. This will provide 10′′ resolution at 150 GHz (near the peak of the thermal SZ decrement) and a 2 degree instantaneous field of view. AtLAST is beginning to garner broad international support, with many US Astro2020 decadal and Canadian Long Range Plan 2020 submissions.