Argonne National Laboratory

Upcoming Events

New Probes of Old Structure: Cosmology with 21-cm Intensity Mapping and the Cosmic Microwave Background

Series 
Physics Colloquium
Presenter 
Laura Newburgh, Yale University
May 18, 2018 11:00AM to 12:00PM
Location 
Building 203
Type 
Colloquium

Abstract: Current cosmological measurements have left us with deep questions about our Universe: What caused the expansion of the Universe at the earliest times? How did structure form? What is Dark Energy and does it evolve with time? New experiments like CHIME, HIRAX, and ACTPol are poised to address these questions through three-dimensional maps of structure and measurements of the polarized Cosmic Microwave Background.

In this talk, I will describe how we will use 21-cm intensity measurements from CHIME and HIRAX to place sensitive constraints on Dark Energy between redshifts 0.8-2.5, a poorly probed era corresponding to when Dark Energy began to impact the expansion history of the Universe. I will also discuss how we will use data from new instruments on the ACT telescope to constrain cosmological parameters like the total neutrino mass and probe structure at late times.