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Astrophysics, Gravitation and Cosmology Seminar - Paul Laplante (Berkeley) "21cm, the CMB, and Galaxies during Reionization: Three Sides of the Same Coin"

Event Type
Department of Physics
Via Zoom
wifi event
Nov 10, 2021   12:00 pm  
Paul Laplante (Berkeley)
Brandy Koebbe
Originating Calendar
Physics - Astrophysics, Gravitation, and Cosmology Seminar
In the coming years, several different experiments are poised to make measurements relevant to understanding Cosmic Dawn and reionization. The Hydrogen Epoch of Reionization Array (HERA) is currently making measurements of the 21cm signal. The Simons Observatory will soon begin observing the cosmic microwave background, including the kinetic Sunyaev-Zel'dovich (kSZ) effect. The Nancy Grace Roman Space Telescope, scheduled to fly later this decade, will provide wide-field surveys of high-redshift galaxies. Taken together, these three observatories will provide us with key insight on astrophysics and cosmology from the high-redshift universe, such as the global ionization fraction and the optical depth to the CMB tau. In this talk, I explore how these measurements can also be combined in cross-correlation to infer some of these parameters. I look in detail at the kSZ^2-galaxy cross correlation, as well as the 21cm-galaxy cross-correlation. I show that these statistics are likely detectable with data from upcoming experiments, though there are still several observational challenges that must be overcome when combining these measurements in practice.




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