Aug 16, 2013

Prof. Nikhil Padmanbhan, Yale University

"Towards 1% Measurements of Cosmological Distances with Cosmic Sound"

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.

Event Details

Date:
Aug 16, 2013

Time:
12–1pm

Location:
Sterling Hall colloquium room, 4th floor

Speaker Host:
David Wake

UW-Madison Astronomy Home