Argonne National Laboratory

Upcoming Events

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

May 9, 2017 12:00PM to 1:00PM
Jason Henning, The University of Chicago
Building 362, Room F108
HEP Special Lunch 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.