Cosmic strings, loops, and linear growth of matter perturbations

Abstract

We describe the detailed study and results of high-resolution numerical simulations of string-induced structure formation in open universes and those with a non-zero cosmological constant. The effect from small loops generated from the string network has also been investigated. We provide a semi-analytical model which can reproduce these simulation results. A detailed study of cosmic string network properties regarding structure formation is also given, including the correlation time, the topological analysis of the source spectrum, the correlation between long strings and loops, and the evolution of long-string and loop energy densities. For models with $\Gamma =\Omega h=0.1--0.2andacolddarkmatterbackground,weshowthatthelineardensityfluctuationpowerspectruminducedbycosmicstringshasbothanamplitudeat$8 h^{-1}$Mpc,$σ_8$, and an overall shape which are consistent within uncertainties with those currently inferred from galaxy surveys. The cosmic string scenario with hot dark matter requires a strongly scale-dependent bias in order to agree with observations.

60 pages, 24 figures

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Cited by in corpus (25)

• Small-Angle CMB Temperature Anisotropies Induced by Cosmic Strings
• Cosmic strings and their induced non-Gaussianities in the cosmic microwave background
• WMAP constraints on inflationary models with global defects
• Large Angle CMB Fluctuations from Cosmic Strings with a Comological Constant
• Probing Cosmic Superstrings with Gravitational Waves
• Unveiling the Dynamics of the Universe
• Cosmological perturbations and the reionization epoch
• CMB power spectrum of Nambu-Goto cosmic strings
• All sky CMB map from cosmic strings integrated Sachs-Wolfe effect
• Localized D-dimensional global k-defects
• Angular 21 cm Power Spectrum of a Scaling Distribution of Cosmic String Wakes
• Cosmic stringlike objects in hybrid metric-Palatini gravity
• CMB anisotropies generated by cosmic string loops
• Cosmic strings in generalized hybrid metric-Palatini gravity
• Stochastic gravitational waves from long cosmic strings
• The bispectrum of cosmic string temperature fluctuations including recombination effects
• The bispectrum of matter perturbations from cosmic strings
• Cosmic strings in Bekenstein-type models
• Note on the Robustness of the Neutrino Mass Bounds from Cosmology
• Thermodynamics of Cosmic Defect Network Evolution
• Cosmic Microwave Background anisotropies generated by cosmic strings with small-scale structure
• Holographic entanglement entropy and complexity for the cosmological braneworld model
• Interferences in the Stochastic Gravitational Wave Background
• String Imprints from a Pre-inflationary Era
• Magnetic field amplification and decay in cosmic string wakes