Cluster abundances and S-Z power spectra: effects of non-Gaussianity and early dark energy

Abstract

In the standard Lambda CDM cosmological model with a Gaussian primordial density fluctuation field, the relatively low value of the mass variance parameter (sigma_8=0.74{+0.05}{-0.06}, obtained from the WMAP 3-year data) results in a reduced likelihood that the measured level of CMB anisotropy on the scales of clusters is due to the Sunyaev-Zeldovich (S-Z) effect. To assess the feasibility of producing higher levels of S-Z power, we explore two alternative models which predict higher cluster abundance. In the first model the primordial density field has a chi^2_1 distribution, whereas in the second an early dark energy component gives rise to the desired higher cluster abundance. We carry out the necessary detailed calculations of the levels of S-Z power spectra, cluster number counts, and angular 2-point correlation function of clusters, and compare (in a self-consistent way) their predicted redshift distributions. Our results provide a sufficient basis upon which the viability of the three models may be tested by future high quality measurements.

12 pages, 5 figures, accepted for publication in MNRAS

References in corpus (5)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Protoclusters associated with z > 2 radio galaxies. I. Characteristics of high redshift protoclusters
• A highly obscured and strongly clustered galaxy population discovered with the Spitzer Space Telescope
• Virialization of cosmological structures in models with time varying equation of state
• Impact of a non-Gaussian density field on Sunyaev-Zeldovich observables

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• Clarifying spherical collapse in coupled dark energy cosmologies
• CMB Lensing Constraints on Neutrinos and Dark Energy
• Primordial non-Gaussianity in the large scale structure of the Universe
• Shifting the Universe: Early Dark Energy and Standard Rulers
• Strong lensing statistics and the power spectrum normalisation
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• The Sunyaev-Zel'dovich effect and Faraday rotation contributions of galaxy groups to the CMB angular power spectrum
• S-Z Power Spectra
• Testing the thermal Sunyaev-Zel'dovich power spectrum of a halo model using hydrodynamical simulations