Data from antipodal places: First use of CMB polarization to detect gravitational lensing from galaxy clusters

The camera on the South Pole Telescope measures minuscule fluctuations in the polarization of cosmic-microwave-background light across the southern sky. Photo: Jason Gallicchio, University of Chicago

In a study published in Physical Review Letters, Fermilab and University of Chicago scientist Brad Benson and colleagues use the polarization, or orientation, of the cosmic microwave background to calculate the masses of enormous galaxy clusters using a new mathematical estimator. This is the first time that scientists have measured these masses using the polarization of the CMB and the novel estimation method.

By Catherine N. Steffel. You can read the article at the Fermilab News web site.

Gravity waves from black holes

Image: Genze/NASA

More than a thousand million years before dinosaurs roamed Earth, a ripple in space was spreading through the universe. Traveling at 300,000 kilometers per second, the speed of light, it had covered 95 percent of its journey to Earth when the dinosaurs became extinct.

By Mike Albrow. You can read this Physics in a Nutshell article here.

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