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SUMMARY:Dark Energy and Cosmic Sound - Daniel Eisenstein (Harvard-Smithson
 ian Center for Astrophysics)
DTSTART:20161027T150000Z
DTEND:20161027T160000Z
UID:TALK67528@talks.cam.ac.uk
CONTACT:Prof Andy Fabian
DESCRIPTION:I will discuss how the acoustic oscillations that propagate in
  the photon-baryon fluid during the first million years of the Universe pr
 ovide a robust method for measuring the cosmological distance scale.  The 
 distance that the sound can travel can be computed to\nhigh precision and 
 creates a signature in the late-time clustering of matter that serves as a
  standard ruler.  Galaxy clustering results from the Sloan Digital Sky Sur
 vey reveal this feature at a variety of redshifts.  I will review our rece
 nt work on the theory and practice of the acoustic oscillation method\, de
 scribe our latest cosmology results from SDSS-III on the expansion history
  of the\nUniverse\, and introduce the upcoming Dark Energy Spectroscopic I
 nstrument (DESI) project.\n
LOCATION:Sackler Lecture Theatre\, IoA (tea at 3:30 pm)
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