Primordial Feature at the Scale of Superclusters of Galaxies

Abstract

We investigate a spatially-flat cold dark matter model (with the matter density parameter ${\Omega }_m=0.3$) with a primordial feature in the initial power spectrum. We assume that there is a bump in the power spectrum of density fluctuations at wavelengths $\lambda \sim 30-60h^{-1}$Mpc, which correspond to the scale of superclusters of galaxies. There are indications for such a feature in the power spectra derived from redshift surveys and also in the power spectra derived from peculiar velocities of galaxies. We study the mass function of clusters of galaxies, the power spectrum of the CMB temperature fluctuations, the rms bulk velocity and the rms peculiar velocity of clusters of galaxies. The baryon density is assumed to be consistent with the BBN value. We show that with an appropriately chosen feature in the power spectrum of density fluctuations at the scale of superclusters, the mass function of clusters, the CMB power spectrum and peculiar velocities are in good agreement with the observed data.

8 pages, 6 figures, with final revisions, MNRAS in press, new CMB data added

References in corpus (2)

• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• Cosmological Density and Power Spectrum from Peculiar Velocities: Nonlinear Corrections and PCA

Cited by in corpus (7)

• Tension between the power spectrum of density perturbations measured on large and small scales
• Features in Dark Energy Equation of State and Modulations in the Hubble Diagram
• Natural Inflation, Planck Scale Physics and Oscillating Primordial Spectrum
• Las Campanas Loose Groups in the Supercluster-Void Network
• Features in the primordial power spectrum: constraints from the CMB and the limitation of the 2dF and SDSS redshift surveys to detect them
• Dynamical state of superclusters of galaxies: do superclusters expand or have they started to collapse?
• Enhanced spectrum of primordial perturbations, galaxy formation and small scale structure