Argonne National Laboratory

Upcoming Events

CMB Polarization on Small (and Large) Scales with the South Pole Telescope

Series 
HEP Special Lunch Seminar
Presenter 
Jason Henning, The University of Chicago
May 9, 2017 12:00PM to 1:00PM
Location 
Building 362, Room F108
Type 
Seminar

Abstract: The temperature and polarization of the cosmic microwave background (CMB) have been measured in exquisite detail by space-based probes such as WMAP and Planck over the full sky on large and intermediate scales. However, a healthy community of ground-based and balloon-borne experiments continue probing the CMB at both large and small scales with ever higher sensitivity.

I will present new ground-based 150-GHz measurements of anisotropies in CMB E-mode polarization and temperature-E-mode correlation in a 500-square-degree patch of sky observed with the SPTpol instrument. Over a range of spherical harmonic multipoles between 50 and 8000, we detect 9 acoustic peaks in the E-mode angular auto-power spectrum. To date, these include the most sensitive measurements of CMB polarization at multipoles greater than 1500. Fitting this expanded multipole range offers a vital cross check to ΛCDM cosmology while being sensitive to additional physics, such as the amount of primordial helium and the number of relativistic species. Finally, I will also briefly discuss expectations for SPT-3G, the newly installed third-generation experiment on the South Pole Telescope.