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.

Survey delivers on dark energy with multiple probes

Published on: September 25, 2019
Researchers used the Blanco telescope in conducting the Dark Energy Survey. The Milky Way is on the left of the sky, with the Magellanic clouds in the center. Photo: Reidar Hahn

Why is our universe accelerating in its expansion? If Einstein’s theory of general relativity is correct, then the dark energy that drives this expansion accounts for nearly 70% of the total energy in the universe. However, precise measurements of the history of this expansion may reveal that new dynamic forces are in play. The Dark Energy Survey has combined its four primary cosmological probes for the first time in order to constrain the properties of dark energy. These first combined constraints are competitive with previous experiments and will improve as more data is analyzed.

By  Michael Troxel. You can read the article at Fermilab’s web site.

Our gothic universe

Categories: Physics in a Nutshell
Published on: January 29, 2017

An introduction to the concept of “dark energy.”, by Don Lincoln.

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