Cosmic-String-Seeded Structure Formation

Abstract

We describe the results of high-resolution numerical simulations of string-induced structure formation in open universes and those with a non-zero cosmological constant. For models with $\Gamma =\Omega h=0.1-0.2$ and a cold dark matter background, we show that the linear density fluctuation power spectrum has both an amplitude at $8h^{-1}Mpc,{\sigma }_8$, 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.

5 pages, 3 figures; to appear in Phys. Rev. Lett. (Sept. 1998). With a cosmological constant included in the evolution equation (1), and simulations carried out accordingly. This verifies the accuracy of the extrapolation scheme for $\Lambda$-models taken previously. Also corrected for a minor error in the standard normalization of wavenumbers $k$, resulting from using an incorrect figure for the time $t_{eq}$ of the equal matter-radiation transition given in the Kolb and Turner textbook "The Early Universe". Main conclusions remain unchanged

References in corpus (6)

• The case against scaling defect models of cosmic structure formation
• CMB Anisotropy Induced by Cosmic Strings on Angular Scales $>15^{\prime }$
• Polarization of the Microwave Background in Defect Models
• Structure formation by cosmic strings with a cosmological constant
• Cosmic Strings in an Open Universe: Quantitative Evolution and Observational Consequences
• Painless causality in defect calculations

Cited by in corpus (43)

• Gravitational Wave Experiments and Early Universe Cosmology
• The astrophysical gravitational wave stochastic background
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• Fractal Properties and Small-scale Structure of Cosmic String Networks
• Bounds on Cosmic Strings from WMAP and SDSS
• Cosmic microwave background anisotropy from wiggly strings
• CMB constraints on cosmic strings and superstrings
• Cosmic Microwave Background Anisotropies from Scaling Seeds: Global Defect Models
• A detail study of defect models for cosmic structure formation
• CMB and density fluctuations from strings plus inflation
• Evolution of the cluster abundance in non-Gaussian models
• Cosmic structure formation in Hybrid Inflation models
• The evolution of a network of cosmic string loops
• Non-gaussian Features of Linear Cosmic String Models
• Cosmological perturbations and the reionization epoch
• VSL theories and the Doppler peak
• Dynamics and properties of chiral cosmic strings in Minkowski space
• Unequal-Time Correlators for Cosmology
• Cosmic strings, loops, and linear growth of matter perturbations
• The Stochastic Gravitational Wave Background Generated by Cosmic String Networks: the Small-Loop Regime
• The Rise and Fall of the Cosmic String Theory for Cosmological Perturbations
• Topological Defects and Cosmology
• Primordial Adiabatic Fluctuations from Cosmic Defects
• Cosmological Consequences of String-forming Open Inflation Models
• Cosmic string loops and large-scale structure
• Self-intersections and gravitational properties of chiral cosmic strings in Minkowski space
• Cosmological parameter dependence in local string theories of structure formation
• The bispectrum of matter perturbations from cosmic strings
• Note on the Robustness of the Neutrino Mass Bounds from Cosmology
• Cosmic strings in Bekenstein-type models
• Reionization by active sources and its effects on the cosmic microwave background
• The statistical physics of cosmological networks of string loops
• A new statistic for picking out Non-Gaussianity in the CMB
• Causal perturbation theory in general FRW cosmologies I: energy momentum conservation and matching conditions
• The growth of linear perturbations in generic defect models for structure formation
• Screwed superconducting cosmic strings
• Topological defects: A problem for cyclic universes?
• Diffusion of massive particles around an Abelian-Higgs string
• Primordial Gaussian Fluctuations from Cosmic Defects
• The cusp properties of High Harmonic Loops
• Cosmological Consequences of Topological Defects: Dark Energy and Varying Fundamental Constants
• Fibration, Nexus and Cosmological Composite Topological Defects in Uniaxially Disordered Superfluid ${}^3$He
• PhD Thesis: String theory in the early universe