1997/10/28 by Daniel J. Eisenstein, Wayne Hu, Joseph Silk +2 · 84 citations
Chemistry · Physics and Astronomy · #Adiabatic process #Astrophysics #Baryon #Big Bang nucleosynthesis #Chemistry #Cluster (spacecraft) #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Nucleosynthesis #Observable #Parameter space #Physics #Polarization (electrochemistry) #Pulsars and Gravitational Waves Research #Quantum mechanics #Redshift #Reionization #Spectral density #Stars #Statistics #Thermodynamics #astro-ph
paper · pdf · doi:10.1086/311171
published in The Astrophysical Journal 494(1), L1-L4 (IOP Publishing) · LaTeX, 7 pages, 5 Postscript figures, submitted to ApJ Letters
arxiv created 1997/10/28 · openalex publication_date 1998/02/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We assess the possibility that baryonic acoustic oscillations in adiabatic models may explain the observations of excess power in large-scale structure on 100 h -1 Mpc scales. The observed location restricts models to two extreme areas of parameter space. In either case, the baryon fraction must be large (Ω b /Ω 0 ≳0.3) in order to yield significant features. The first region requires Ω 0 ≲0.2 h to match the location, implying large blue tilts ( n ≳1.4) to satisfy cluster abundance constraints. The power spectrum also continues to rise toward larger scales in these models. The second region requires Ω 0 ≈ 1, implying Ω b well out of the range of big bang nucleosynthesis constraints; moreover, the peak is noticeably wider than the observations suggest. Testable features of both solutions are that they require moderate reionization and thereby generate potentially observable (~1 μK) large-angle polarization, as well as subarcminute temperature fluctuations. In short, baryonic features in adiabatic models may explain the observed excess only if currently favored determinations of cosmological parameters are in substantial error or if present surveys do not represent a fair sample of 100 h -1 Mpc structures.