Baryonic Acoustic Oscillations

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Presentation transcript:

Baryonic Acoustic Oscillations One wave around one center: Wave starts propagating at Big Bang; end at recombination. The final length is the sound crossing horizon at recomb. (Change of color means recombination.) Many waves superimposed

Matter power spectrum - observations Baryonic Acoustic Oscillations (BAO) SDSS and 2dF galaxy surveys from k-space to real space BAO bump gal. corr. fcn. Narrow feature: standard ruler (sound crossing horizon at recombination) comoving r (Mpc/h) Eisenstein et al. astro-ph/0501171 Percival et al. astro-ph/0705.3323

Recombination affects the matter power spectrum too sound horizon size at recombination Luminous SDSS red galaxies, z ~ 0.35 Wmh2=0.12, 0.13, 0.14 galaxy correlation function Eisenstein et al. astro-ph/0501171

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