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Nils Halverson develops millimeter-wavelength instrumentation to study the origins of the universe through observations of the Cosmic Microwave Background (CMB). Observations of the CMB can be used to gather evidence for gravitational waves released by an early period of inflation, and can be used to constrain the neutrino mass and the understand the growth of structure and dark energy. He is currently a co-investigator on two ground-based CMB experiments: the South Pole Telescope (SPT) and Polarbear/Simons Array. He is also Co-I on a NASA Technology Development Grant for Advancing Focal Plane TRL for LiteBIRD and Other Next-Generation CMB Space Missions.

Selected Publications:

J. W. Henning, J.T. Sayre, C. L. Reichardt et al., “Measurements of the Temperature and E-Mode Polarization of the CMB from 500 Square Degrees of SPTpol Data,” The Astrophysical Journal, 852, 97, 2018.

The POLARBEAR Collaboration, “A Measurement of the Cosmic Microwave Background B-Mode Polarization Power Spectrum at Sub-Degree Scales from 2 years of POLARBEAR Data,” The Astrophysical Journal, 848, 121, 2017.

T. Matsumura et al., “LiteBIRD: Mission Overview and Focal Plane Layout,” Journal of Low Temperature Physics, DOI 10.1007/s10909-016-1542-8, 2016.

N. W. Halverson, T. Lanting et al.,�� “Sunyaev-Zel’dovich Effect Observations of the Bullet Cluster (1E 0657-56) with APEX-SZ,” The Astrophysical Journal, 701, 42, 2009.

J. Kovac, E. M. Leitch, C. Pryke, J. E. Carlstrom, N. W. Halverson & W. L. Holzapfel, “Detection of Polarization in the Cosmic Microwave Background using DASI,” Nature, 420, 772, 2002.