Résumé / Abstract Seminaire_IAP
« Baryon Acoustic Oscillations: A Robust and Precise Route to the Cosmological Distance Scale »

Daniel Eisenstein
Univ. Arizona (Tucson, Arizona, Etats-Unis d'Amérique)

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.
vendredi 28 mai 2010 - 11:00
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
Page web du séminaire / Seminar's webpage