Autumn 2002 / Leading Edge
The Music of the Cosmos

Researchers gain their first glimpse of the primordial structures that grew into today’s galaxy clusters


Cosmologists from Canada, the United States and Chile have unveiled detailed observations of the universe some 14 billion years ago – long before the existence of stars and galaxies. The data, from the Cosmic Background Imager (CBI) experiment in Chile, gives researchers their first glimpse of the primordial structures that grew into the massive clusters of galaxies seen today. Analyzing this data, says Professor Richard Bond, director of U of T’s Canadian Institute for Theoretical Astrophysics and a member of the CBI team, is “like listening to the music of the cosmos.” The CBI is a highly sensitive 13-antenna device that makes images of cosmic microwave background (CMB) radiation. The radiation was released 400,000 years after the Big Bang, at a time when the hot plasma of the universe cooled enough to become transparent. CBI detects slight temperature variations in the plasma, which are due to sound waves. Previous CMB research revealed what Bond describes as “an underlying bass sound,” followed by a booming mid-range note and two higher harmonic peaks. The new CBI results triple the measurement range, revealing hot spots in the radiation that point to “clumps” of matter in an otherwise smooth early universe. These “clumps” eventually became clusters of galaxies.


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