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Physics Colloquium, "Towards 1% Measurements of Cosmological Distances with Cosmic Sound"

Event Type
Seminar/Symposium
Topic
physics
Sponsor
Physics Department
Location
141 Loomis
Date
Mar 12, 2014   4:00 pm  
Speaker
Nikhil Padmanabhan, Department of Astronomy, Yale University
Cost
None
Contact
Marjorie Gamel
E-Mail
mgamel@illinois.edu
Phone
217-333-3762
Views
6137
Originating Calendar
Physics - Colloquium

Measuring the accelerated expansion of the Universe with the goal of better understanding its underlying physics is one of the leading programs in cosmology today. The baryon acoustic oscillation technique is one of the foremost tools in our toolbox today. This talk will explain the underlying physics of this method and the reasons it is extremely robust to observational and theoretical systematic errors. I will then present the latest results from the SDSS and BOSS surveys, currently the most precise distance constraints from this method. These will include a new analysis technique to undo the effects of the nonlinear evolution of the density field and partially "reconstruct" the initial density field.  

I will discuss the implications of these measurements, and will conclude by discussing prospects for improvements in the immediate and not-so-immediate future.

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