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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20120216T000000
DTEND;TZID=Atlantic/Canary:20120216T010000
UID:iactalks-370
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/370
CREATED:2012-02-16T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Dark Energy and Cosmic Sound
DESCRIPTION:Dark Energy and Cosmic Sound\nDr. Daniel Eisenstein\n\nI will d
 iscuss how the acoustic oscillations that propagate in the photon-baryon f
 luid during the first million years of the Universe provide a robust metho
 d for measuring the cosmological distance scale.  The distance that the so
 und can travel can be computed to high precision and creates a signature i
 n the late-time clustering of matter that serves as a standard ruler.  Gal
 axy clustering results from the Sloan Digital Sky Survey reveal this featu
 re, giving a geometric distance to a redshift of 0.3 and an accurate measu
 rement of Omega_matter.  I will review our recent work on the theory and p
 ractice of the acoustic oscillation method and our latest cosmology result
 s from SDSS-II.  I will then present SDSS-III, which will use the acoustic
  method to produce 1% distance measurements in order to map the curvature 
 and expansion history of the Universe and measure the evolution of dark en
 ergy.
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