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South Pole Telescope

July 22, 2013: Detection of B-mode Polarization by SPTpol.



July 22, 2013: B-mode polarization detected with SPTpol. The B-mode polarization induced by gravitational lensing is detected in SPTpol data by first creating a template of lensing B modes then cross-correlating this template with the SPTpol B-mode data. The template is created using the measured SPTpol E-mode polarization and an estimate of the lensing potential from Herschel-SPIRE maps of the cosmic infrared background. The plots shows the result of this cross-correlation in black bars (with results from consistency tests as green and orange bars), along with the prediction for this signal using our current best-fit cosmological model as the dashed line. The grey bars are the result of a null test.


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July, 2013: B-mode polarization detected with SPTpol.

Scientists from the South Pole Telescope (SPT) project have detected subtle distortions referred to as 'B-modes' in the polarization of the Cosmic Microwave Background (CMB, preprint here). These distortions---detected for the first time in data from SPTpol, the polarization-sensitive receiver installed on the SPT in January, 2012---are thought to have only two sources: gravitational lensing of the more conventional 'E-mode' CMB polarization, and a background of gravitational waves from the epoch of cosmic inflation. The signals detected by SPTpol are due to gravitational lensing, and a sufficiently sensitive measurement of these signals will help us learn about neutrinos through their impact on the growth of structure in the universe. Successfully detecting this tiny B-mode signal also represents a major milestone along the way to using the CMB to learn about the earliest moments of the universe with the inflationary B modes.

  The South Pole Telescope is funded through the National Science Foundation and the Department of Energy Office of Science. NSF DOE

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