Measuring CMB non-Gaussianity as a probe of Inflation and Cosmic Strings
arXiv:1112.5899
Abstract
The leading candidate for the very early universe is described by a period of rapid expansion known as inflation. While the standard paradigm invokes a single slow-rolling field, many different models may be constructed which fit the current observational evidence. In this work we outline theoretical and observational studies of non-Gaussian fluctuations produced by models of inflation and by cosmic strings - topological defects that may be generated in the very early universe during a phase transition. In particular, we consider the imprint of cosmic strings on the cosmic microwave background (CMB) and describe a formalism for the measurement of general four-point correlation functions, or trispectra, using the CMB. In addition we describe the application of our methodology to non-Gaussian signals imprinted in the large scale structure of the universe. Such deviations from Gaussianity are generally expressed in terms of the so-called bispectrum and trispectrum.
PhD Thesis, DAMTP, Cambridge, Supervisor: E.P.S. Shellard (230 pages, 46 figures)
References in corpus (45)
- Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
- Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
- Observational Signatures and Non-Gaussianities of General Single Field Inflation
- The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
- Primordial Non-Gaussianities from Inflation Models
- Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
- The bispectrum of galaxies from high-redshift galaxy surveys: primordial non-Gaussianity and non-linear galaxy bias
- The shape of primordial non-Gaussianity and the CMB bispectrum
- Primordial trispectrum from inflation
- CMB power spectrum contribution from cosmic strings using field-evolution simulations of the Abelian Higgs model
- Fitting CMB data with cosmic strings and inflation
- Angular Trispectrum of CMB Temperature Anisotropy from Primordial Non-Gaussianity with the Full Radiation Transfer Function
- The Inflationary Trispectrum for Models with Large Non-Gaussianities
- The 21cm angular-power spectrum from the dark ages
- General CMB and Primordial Bispectrum Estimation I: Mode Expansion, Map-Making and Measures of f_NL
- Dark energy and curvature from a future baryonic acoustic oscillation survey using the Lyman-alpha forest
- CMB temperature lensing power reconstruction
- CMB Constraints on Primordial non-Gaussianity from the Bispectrum (f_{NL}) and Trispectrum (g_{NL} and τ_{NL}) and a New Consistency Test of Single-Field Inflation
- The "in-in" Formalism and Cosmological Perturbations
- Constraints on Supersymmetric Models of Hybrid Inflation
- Small-Angle CMB Temperature Anisotropies Induced by Cosmic Strings
- Non-gaussianity from the trispectrum in general single field inflation
- General CMB and Primordial Trispectrum Estimation
- Analytic Study of Small Scale Structure on Cosmic Strings
- Signature of Primordial Non-Gaussianity on Matter Power Spectrum
- On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part I: the Bispectrum
- On Classification of Models of Large Local-Type Non-Gaussianity
- Cosmic Strings and Cosmic Superstrings
- Cosmic strings and their induced non-Gaussianities in the cosmic microwave background
- Constraining Primordial Non-Gaussianity with High-Redshift Probes
- On the full quantum trispectrum in multi-field DBI inflation
- Primordial non-Gaussianity in the large scale structure of the Universe
- Rapid Separable Analysis of Higher Order Correlators in Large Scale Structure
- The CMB temperature bispectrum induced by cosmic strings
- Cosmic microwave anisotropies from BPS semilocal strings
- General Single Field Inflation with Large Positive Non-Gaussianity
- Can large-scale structure probe CMB-constrained non-Gaussianity?
- Optimal Trispectrum Estimators and WMAP Constraints
- Scaling configurations of cosmic superstring networks and their cosmological implications
- The effect of kinematic constraints on multi-tension string network evolution
- Testing models of inflation with CMB non-gaussianity
- Textures and Semi-Local Strings in SUSY Hybrid Inflation