Small Angular Scale CMB Anisotropies from CBI and BIMA: Early Universe or Local structures ?

Abstract

The advent of high resolution cosmic microwave background (CMB) experiments now allows studies on the temperature fluctuations at scales corresponding to few arcminutes and below. Though the reported excess power at $\ell \sim 2000-6000$ by CBI and BIMA is roughly consistent with a secondary contribution resulting from the Sunyaev-Zeldovich effect, this requires a higher normalization for the matter power spectrum than measured by other means. In addition to a local red-shift contribution, another strong possibility for anisotropies at very small scales involve non-standard aspects of inflationary models. To distinguish between contributions from early universe and local structures, including a potential point source contribution, and to understand the extent to which structures at low red-shifts contribute to small scale temperature anisotropies, it maybe necessary to perform a combined study involving CMB and the large scale structure. We suggest a cross-correlation of the temperature data with a map of the large scale structure, such as the galaxy distribution. For next generation small angular scale CMB experiments, multi-frequency observations may be a necessary aspect to allow an additional possibility to distinguish between these different scenarios.

6 pages, 5 figures. Revised version. To appear in Phys. Rev. D

References in corpus (10)

• A measurement by BOOMERANG of multiple peaks in the angular power spectrum of the cosmic microwave background
• DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum
• A High Spatial Resolution Analysis of the MAXIMA-1 Cosmic Microwave Background Anisotropy Data
• Voids in the PSCz Survey and the Updated Zwicky Catalog
• A new upper limit on the total neutrino mass from the 2dF Galaxy Redshift Survey
• Current constraints on the dark energy equation of state
• The integrated Sachs-Wolfe Effect -- Large Scale Structure Correlation
• Non-Gaussian Aspects of Thermal and Kinetic Sunyaev-Zel'dovich Effects
• On the density of Cold Dark Matter
• Constraints from the damping tail

Cited by in corpus (13)

• High Resolution Observations of the CMB Power Spectrum with ACBAR
• High resolution CMB power spectrum from the complete ACBAR data set
• Small-scale CMB polarization anisotropies due to tangled primordial magnetic fields
• Improved Measurements of the CMB Power Spectrum with ACBAR
• ACBAR: The Arcminute Cosmology Bolometer Array Receiver
• Beyond the Damping Tail: Cross-Correlating the Kinetic Sunyaev-Zel'dovich Effect with Cosmic Shear
• Discriminating between unresolved point sources and "negative" SZ clusters in CMB maps
• A Theory of a Spot
• Weak Lensing of the CMB: Cumulants of the Probability Distribution Function
• Impact of Point Source Clustering on Cosmological Parameters with CMB Anisotropies
• Estimating small angular scale CMB anisotropy with high resolution N-body simulations: weak lensing
• Sunyaev-Zel'dovich contribution in CMB analysis
• Statistical Imprints of SZ Effects in the Cosmic Microwave Background