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Cosmology and Astrophysics with the Atacama Cosmology Telescope

ORAL

Abstract

I will present the latest maps of the millimeter-wave sky as seen by the Atacama Cosmology Telescope (ACT), and describe how they are advancing our knowledge of cosmology via significantly improved measurements of the cosmic microwave background (CMB). I will discuss constraints on the cosmological model derived from the ACT CMB power spectra, including the standard LCDM model and several extensions involving new physics. I will also present our latest sample of thousands of galaxy clusters obtained from these maps, as well as our latest maps of the distribution of dark matter inferred from gravitational lensing of the CMB, and maps of the gas distribution around groups and clusters. I will briefly highlight novel astrophysical applications of these maps, including searches for transient signals and thermal emission from a potential Planet 9. I will conclude with a look ahead to forthcoming CMB data from ACT, which will provide a powerful test of the cosmological model in a currently-uncharted regime.

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Publication: J. C. Hill, et al. ``The Atacama Cosmology Telescope: Constraints on Pre-Recombination Early Dark Energy'' (2021). Phys. Rev. D submitted, arXiv:2109.04451<br>S. K. Choi, et al. ``The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectra at 98 and 150 GHz'' (2020). JCAP, 12, 045, arXiv:2007.07289<br>S. Aiola, et al. ``The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters'' (2020). JCAP, 12, 047, arXiv:2007.07288<br>M. Hilton, et al. ``The Atacama Cosmology Telescope: A Catalog of > 4000 Sunyaev-Zel'dovich Galaxy Clusters'' (2020). ApJS, 253, 3, arXiv:2009.11043<br>S. Amodeo, et al. ``The Atacama Cosmology Telescope: Modelling the Gas Thermodynamics in BOSS CMASS galaxies from Kinematic and Thermal Sunyaev-Zel'dovich Measurements'' (2020). Phys. Rev. D, 103, 063514, arXiv:2009.05558<br>E. Schaan, et al. ``The Atacama Cosmology Telescope: Combined kinematic and thermal Sunyaev-Zel'dovich measurements from BOSS CMASS and LOWZ halos'' (2020). Phys. Rev. D, 103, 063513, arXiv:2009.05557<br>S. K. Naess, et al. ``The Atacama Cosmology Telescope: Detection of mm-wave transient sources'' (2021). ApJ, 915, 14, arXiv:2012.14347<br>S. K. Naess, et al. ``The Atacama Cosmology Telescope: A Search for Planet 9'' (2021). ApJ submitted, arXiv:2104.10264

Presenters

  • James C Hill

    Columbia University, Columbia Univ

Authors

  • James C Hill

    Columbia University, Columbia Univ