Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21720508g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #205.08; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
The Dark Energy Survey (DES) will use a new imaging camera on the Blanco 4-m telescope at CTIO to image 5000 square degrees of sky in the South Galactic Cap in five optical bands. I will outline what science we expect from the study of the large scale structure traced by the galaxy distribution in DES. Oscillations of the coupled photon-baryon fluid in the early Universe imprint a "standard ruler” on the galaxy power spectrum. The length of this standard ruler can be calibrated using cosmic microwave background (CMB) anisotropy measurements, in particular from the Planck experiment. Measurements of the galaxy power spectrum in the transverse and line-of-sight directions then yield values of the angular diameter distance dA(z) and Hubble parameter H(z), respectively. DES experiment can use the broad-band shape of the power spectrum in addition to the oscillation wavelengths themselves, at the price of somewhat stronger model dependence. Redshift space distortions and cross-correlation can also provide valuave information on cosmological parameters.
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