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The Arcminute Cosmology Bolometer Array Receiver (ACBAR) is a sensitive multi-frequency reciever designed to measure slight temperature differences in the Cosmic Microwave Background. The Cosmic Microwave Background (CMB) is the faint afterglow of the Big Bang which formed the universe. Most of these temperature differences in the CMB resulted from quantum fluctuations which grew during the rapid expansion of the very early universe while some of them resulted from the interaction of CMB photons with clusters of galaxies via the Sunyaev-Zel'dovich effect. Observations of both types of CMB fluctuations can tell us about the composition and evolution of the universe.

The ACBAR instrument is based out of U.C. Berkeley (W.L. Holzapfel, co-PI) and Case Western Reserve University (J. Ruhl, co-PI). Please visit the U.C. Berkeley website for the latest ACBAR information, publications, and data.

ACBAR was funded by the Center for Astrophysical Research in Antarctica which is a NSF Science and Technology Center.