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SUMMARY:Dark Energy and Cosmic Sound - Daniel Eisenstein (Harvard-Smithson
 ian Center for Astrophysics).
DTSTART:20161027T150000Z
DTEND:20161027T160000Z
UID:TALK95650@talks.cam.ac.uk
CONTACT:Richard McMahon
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 d
 istance that the sound can travel can be computed to high precision and cr
 eates a signature in the late-time clustering of matter that serves as a s
 tandard ruler. Galaxy clustering results from the Sloan Digital Sky Survey
  reveal this feature at a variety of redshifts. I will review our recent w
 ork on the theory and practice of the acoustic oscillation method\, descri
 be our latest cosmology results from SDSS -III on the expansion history of
  the Universe\, and introduce the upcoming Dark Energy Spectroscopic Instr
 ument (DESI) project.\n\n
LOCATION:Sackler Lecture Theatre\, IoA (tea at 3.30 pm)
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