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Physics Today and Science News cite ACT Detection of Gravitational Lensing as one of the Leading Physics Discoveries of 2011

Blake Sherwin, a physics graduate student working with David Spergel, and Sudeep Das, a recent Princeton astrophysics PhD have led the first CMB-only detection of gravitational lensing of the CMB using data from the Atacama Cosmology Telescope (ACT).  Using this detection and data from the Wilkinson Microwave Anisotropy Probe, they have shown that this detection implies that the universe is filled with dark energy.

Physics Today cited this work as one of the top physics results of 2011

High Resolution data demonstrate gravitational lensing of the cosmic microwave backround.

Science News also listed the ACT detection as one of its top physics stories:

2011 Science News of the Year: Atom & Cosmos