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Physics Colloquium

Thursday, January 28, 2021
4:00pm to 5:00pm
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Online Event
Predicting the universe today from looking at the past with the Atacama Cosmology Telescope
Suzanne Staggs, Princeton University,

 From measurements of its remnant radiation, we comprehend more about the primordial universe than one might have guessed possible.  Knowledge of the present-day universe gives hindsight for modeling the early universe and its dynamics.   Data from the Planck satellite have been compressed to a set of six parameters describing initial conditions.  Those six  can be used to predict aspects of the present-day universe, including its present expansion rate.   Measurements of the expansion rate measured from the recessional speeds of supernovae in the local universe disagree with the predictions from Planck.  The fault could be due to  Planck, the model, or the local measurements.  Recently, data from the WMAP satellite have been combined with data from the Atacama Cosmology Telescope (ACT)  for an independent prediction.   To compete with the powerful data set provided from a  major space mission requires years of observations from bespoke arrays of  thousands of detectors cooled to 100 mK,  deployed on a special-purpose 6 m telescope on an arid plateau at 17,000 ft. The instrument and the results of the independent WMAP+ACT predictions will be described.

Please click the link below to join the webinar:

Webinar ID: 826 2427 7023