Analytical modeling of large-angle CMBR anisotropies from textures

Abstract

We propose an analytic method for predicting the large angle CMBR temperature fluctuations induced by model textures. The model makes use of only a small number of phenomenological parameters which ought to be measured from simple simulations. We derive semi-analytically the $C^l$-spectrum for $2\le l\le 30$ together with its associated non-Gaussian cosmic variance error bars. A slightly tilted spectrum with an extra suppression at low $l$ is found, and we investigate the dependence of the tilt on the parameters of the model. We also produce a prediction for the two point correlation function. We find a high level of cosmic confusion between texture scenarios and standard inflationary theories in any of these quantities. However, we discover that a distinctive non-Gaussian signal ought to be expected at low $l$, reflecting the prominent effect of the last texture in these multipoles.

References in corpus (8)

• The Angular Dependence of the Three-Point Correlation Function of the Cosmic Microwave Background Radiation as Predicted by Inflationary Cosmologies
• COBE vs Cosmic Strings: An Analytical Model
• On the Statistics of CMB Fluctuations Induced by Topological Defects
• Microwave Anisotropies from Texture Seeded Structure Formation
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• Texture-Induced Microwave Background Anisotropies
• Non-Gaussian CMBR angular power spectra
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Cited by in corpus (8)

• The closet non-Gaussianity of anisotropic Gaussian fluctuations
• Cosmic Microwave Background non-Gaussian signatures from analytical texture models
• Bianchi VII_h models and the cold spot texture
• Non-Gaussian CMBR angular power spectra
• Non-Gaussian Signatures from the Postinflationary Early Universe
• Field Ordering and Energy Density in Texture Cosmology
• Searching for Long Strings in CMB Maps
• Phenomenological aspects of dark energy dominated cosmologies