Daniel Eisenstein
Univ. Arizona (Tucson, Arizona, Etats-Unis d'Amérique)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « Baryon Acoustic Oscillations: A Robust and Precise Route to the Cosmological Distance Scale » |
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Daniel Eisenstein |
| I will discuss how the acoustic oscillations that propagate in the photon-baryon fluid during the first million years of the Universe provide a robust method for measuring the cosmological distance scale. The distance that the sound can travel can be computed to high 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 Survey reveal this feature, giving a geometric distance to a redshift of 0.35 and an accurate measurement of Omega_matter. I will review our recent work on the theoretical modeling of the shifts and scatter of the acoustic scale in N-body simulations. I will then discuss our plans for SDSS-III, which will feature a large redshift survey aimed at refining the acoustic oscillation distance scale to 1%, as well as surveys for extrasolar planets and the structure of the Milky Way. |
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vendredi 28 mai 2010 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |