Baryonic Signatures in Large-Scale Structure

Details Baryonic Signatures in Large-Scale Structure Baryonic Signatures in Large-Scale Structure

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.526m&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We investigate the possibility of detecting acoustic oscillations in the matter power spectrum as estimated from galaxy surveys. These oscillations are the remnants of acoustic waves in the photon-baryon fluid before last scattering. For acceptable values of the cosmological and baryon densities, the oscillations modulate the power by up to ~10%, with a period in spatial wavenumber of Delta k = 0.05 Mpc^{-1}. We demonstrate that nonlinear evolution will wash out all but the two largest peaks. Nonetheless, a detection may be possible by large scale surveys likes the 2dF and the SDSS. The detection of the feature would provide strong constraints on cosmological models for structure formation and the baryon fraction of the universe.

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