AAS 202nd Meeting, May 2003
Session 23 Observational Probes of Dark Energy
Topical Oral, Tuesday, May 27, 2003, 8:30-10:00am, 10:45am-12:30pm, 2:00-3:30pm and 3:45-5:30pm, 205/206

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[23.10] Dark Energy and Cosmic Sound

D.J. Eisenstein, H. Seo (Steward Observatory)

The acoustic oscillations of the photon-baryon fluid in the early universe imprints a signature of known scale into the clustering of matter and galaxies at recent times. Large galaxy redshift surveys can recover this scale as a set of oscillations in the power spectrum, thereby measuring the Hubble parameter and angular diameter distance relation as a function of redshift. I show that ambitious (of order one million galaxy) future surveys at redshifts one and three could be used to measure these cosmological distances to few percent accuracy. I then propagate these results to forecast constraints on the dark energy equation of state. I will describe a concept for a spectrograph that could enable such surveys.

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© 2003. The American Astronomical Soceity.