The main goal of the Observational
Cosmology group at the University of Wisconsin-Madison
is to answer fundamental questions about the beginning
and evolution of the universe.
One tool we use is precision
measurements of the Cosmic Microwave Background (CMB) radiation. The image on the
left is a map of the CMB sky from the WMAP mission.
The CMB is the oldest light in the universe. By observing the CMB we hope to learn about the epoch of
inflation, which occured roughly 10-36
seconds after the Big Bang.
We are also developing
techniques to observe the
redshifted 21-cm line of neutral hydrogen gas in order to study the large-scale structure of the Universe. The evolution of this structure probes the accelerating expansion of
the universe, dark energy, the neutrino masses, and other cosmological parameters.