Searching for Signatures of Cosmic Superstrings in the CMB

Abstract

Because cosmic superstrings generically form junctions and gauge theoretic strings typically do not, junctions may provide a signature to distinguish between cosmic superstrings and gauge theoretic cosmic strings. In cosmic microwave background anisotropy maps, cosmic strings lead to distinctive line discontinuities. String junctions lead to junctions in these line discontinuities. In turn, edge detection algorithms such as the Canny algorithm can be used to search for signatures of strings in anisotropy maps. We apply the Canny algorithm to simulated maps which contain the effects of cosmic strings with and without string junctions. The Canny algorithm produces edge maps. To distinguish between edge maps from string simulations with and without junctions, we examine the density distribution of edges and pixels crossed by edges. We find that in string simulations without Gaussian noise (such as produced by the dominant inflationary fluctuations) our analysis of the output data from the Canny algorithm can clearly distinguish between simulations with and without string junctions. In the presence of Gaussian noise at the level expected from the current bounds on the contribution of cosmic strings to the total power spectrum of density fluctuations, the distinction between models with and without junctions is more difficult. However, by carefully analyzing the data the models can still be differentiated.

15 pages

References in corpus (9)

• Cosmological parameters from combining the Lyman-alpha forest with CMB, galaxy clustering and SN constraints
• CMB power spectrum contribution from cosmic strings using field-evolution simulations of the Abelian Higgs model
• Fitting CMB data with cosmic strings and inflation
• Constraints on Supersymmetric Models of Hybrid Inflation
• Small-Angle CMB Temperature Anisotropies Induced by Cosmic Strings
• Constraints on string networks with junctions
• Detecting Cosmic Strings in the CMB with the Canny Algorithm
• Cosmic Strings from Supersymmetric Flat Directions
• Lensing and CMB Anisotropies by Cosmic Strings at a Junction

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• All sky CMB map from cosmic strings integrated Sachs-Wolfe effect
• Unconventional Cosmology
• The 21 cm Signature of Shock Heated and Diffuse Cosmic String Wakes
• Angular 21 cm Power Spectrum of a Scaling Distribution of Cosmic String Wakes
• Large scale CMB anomalies from thawing cosmic strings
• Level Crossing Analysis of Cosmic Microwave Background Radiation: A method for detecting cosmic strings
• Analytical Study of Mode Coupling in Hybrid Inflation
• Canny Algorithm: A New Estimator for Primordial Non-Gaussianities
• Cosmic Strings-induced CMB anisotropies in light of Weighted Morphology