I am a Professor of Astrophysics at the Dunlap Institute in the Department of Astronomy and Astrophysics at the University of Toronto in Canada.
Tel: +1 (416) 978-4971
Email: hlozek at dunlap dot
utoronto do ca
I use data from the Atacama Cosmology Telescope, which is based the Northern Chile. ACT measures the temperature (and soon ACTPol will measure the polarisation) of the Cosmic Microwave Background (CMB), light that has been travelling to us from shortly after the big bang.
ACT measures this light with incredible angular resolution, allowing us to constrain the cosmological model of the universe, as we did here.
The CMB light is also lensed by structures between us and hte surface of last scattering (where the CMB is produced). We reconstruct the lensing field and use it to constrain the structure (and amount of dark energy) in the universe, as is discussed here.
This plot from Dunkley et al. 2010 shows the ACT 2008 Southern Data and how it distinguishes between different cosmological models on small scales.