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J. Sievers (CITA), CBI Collaboration
The CBI is a 13-element interferometer operating between 26 and 36 GHz at an altitude of 5080 meters in the Chilean Andes, covering a range in \ell between 400 and 3500. It has been observing the Cosmic Microwave Background since January 2000, and in a polarization-optimized configuration since September 2002. We discuss the latest results from CBI observations of the CMB in total intensity and polarization, including the most significant detection of CMB E-mode polarization to date, and their cosmological implications. When the CBI EE spectrum is combined with the lower-\ell DASI and Boomerang EE spectra, the angular scale of the power spectrum is determined to better than 3 independendent of TT measurements, a powerful consistency check on the standard model. The polarization data are consistent with adiabatic-only fluctuations, and are highly inconsistent with models that grossly modify the heights or locations of the Doppler peaks, such as would happen if there were significant isocurvature fluctuations.
This work is supported by NSERC, the Canadian Institute for Advance Research, the NSF, Barbara and Stanley Rawn, Jr., Rochus Vogt, and Oxford University
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.