Cosmology of the Very Early Universe

Abstract

In these lectures I focus on early universe models which can explain the currently observed structure on large scales. I begin with a survey of inflationary cosmology, the current paradigm for understanding the origin of the universe as we observe it today. I will discuss some progress and problems in inflationary cosmology before moving on to a description of two alternative scenarios - the Matter Bounce and String Gas Cosmology. All early universe models connect to observations via the evolution of cosmological perturbations - a topic which will be discussed in detail in these lectures.

38 pages, 15 figures, to be published in the proceedings of the XIV Special Course in Astronomy, Observatorio Nacional, Brazil

References in corpus (90)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Non-Gaussian features of primordial fluctuations in single field inflationary models
• Quantum Gravity at a Lifshitz Point
• The Standard Model Higgs boson as the inflaton
• Towards the Theory of Reheating After Inflation
• k-Inflation
• Reheating after Inflation
• The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang
• Cosmic strings
• Hybrid Inflation
• Dark Energy Constraints from the Cosmic Age and Supernova
• Pre-Big-Bang in String Cosmology
• Universe Reheating after Inflation
• Scalar Speed Limits and Cosmology: Acceleration from D-cceleration
• Adiabatic and entropy perturbations from inflation
• Dumb Holes and the Effects of High Frequencies on Black Hole Evaporation
• The phantom menaced: constraints on low-energy effective ghosts
• Primordial Non-Gaussianities from Inflation Models
• The Emergent Universe: inflationary cosmology with no singularity
• Hawking Spectrum and High Frequency Dispersion
• On the Generation of a Scale-Invariant Spectrum of Adiabatic Fluctuations in Cosmological Models with a Contracting Phase
• Oscillating Quintom and the Recurrent Universe
• Duality Invariance of Cosmological Perturbation Spectra
• Eternal inflation and the initial singularity
• Matter Bounce in Horava-Lifshitz Cosmology
• Adiabatic Modes in Cosmology
• Producing a Scale-Invariant Spectrum of Perturbations in a Hagedorn Phase of String Cosmology
• Mirage Cosmology
• Brane Gases in the Early Universe
• The Lee-Wick Standard Model
• Microphysical Approach to Nonequilibrium Dynamics of Quantum Fields
• String Gas Cosmology
• A Cosmological Theory without Singularities
• A Nonsingular Cosmology with a Scale-Invariant Spectrum of Cosmological Perturbations from Lee-Wick Theory
• Topological Defects and Structure Formation
• On matching conditions for cosmological perturbations
• Cosmological Perturbations From Inhomogeneous Reheating, Freeze-Out, and Mass Domination
• Parametric Amplification of Gravitational Fluctuations During Reheating
• Tensor Modes from a Primordial Hagedorn Phase of String Cosmology
• Probing String Theory with Modulated Cosmological Fluctuations
• Parametric Amplification of Metric Fluctuations During Reheating in Two Field Models
• Cosmological perturbations through a simple bounce
• String Gas Cosmology and Structure Formation
• Adiabatic perturbations in pre big bang models: matching conditions and scale invariance
• Moduli Stabilization with the String Higgs Effect
• Non-Gaussianity in a Matter Bounce
• Stabilization of Extra Dimensions at Tree Level
• Massless Metric Preheating
• Back-Reaction and the Trans-Planckian Problem of Inflation Revisited
• Is there an imprint of Planck scale physics on inflationary cosmology?
• Dilaton, winding modes and cosmological solutions
• A Model Of Inflationary Cosmology Without Singularity
• Minimal modifications of the primordial power spectrum from an adiabatic short distance cutoff
• On the Decoherence of Primordial Fluctuations During Inflation
• On T-Duality in Brane Gas Cosmology
• Numerical Experiments in String Cosmology
• Cosmological perturbations from varying masses and couplings
• Isotropization in Brane Gas Cosmology
• Super-Hubble Nonlinear Perturbations During Inflation
• Interaction Rates in String Gas Cosmology
• Thermal Fluctuations and Bouncing Cosmologies
• Reheating in the Presence of Noise
• The Scalar, Vector and Tensor Contributions to CMB anisotropies from Cosmic Defects
• Pre-Big-Bang Requires the Universe to be Exponentially Large From the Very Beginning
• Detecting Cosmic Strings in the CMB with the Canny Algorithm
• Canny Algorithm, Cosmic Strings and the Cosmic Microwave Background
• Back Reaction of Cosmological Perturbations and the Cosmological Constant Problem
• A comment on trans-Planckian physics in inflationary universe
• Vector Perturbations in a Contracting Universe
• Moduli Stabilization in String Gas Cosmology
• Processing of Cosmological Perturbations in a Cyclic Cosmology
• Edge Detection, Cosmic Strings and the South Pole Telescope
• On the Initial Conditions for Brane Inflation
• Reheating in the Presence of Inhomogeneous Noise
• Stabilizing moduli with thermal matter and nonperturbative effects
• Inflationary Cosmology: Progress and Problems
• Cosmological Perturbations on a Bouncing Brane
• Challenges for String Gas Cosmology
• Geometric Precipices in String Cosmology
• Inflation Free, Stringy Generation of Scale-Invariant Cosmological Fluctuations in D = 3 + 1 Dimensions
• A Study of Structure Formation and Reheating in the D3/D7 Brane Inflation Model
• Towards A Nonsingular Tachyonic Big Crunch
• On the Transfer of Adiabatic Fluctuations through a Nonsingular Cosmological Bounce
• Adiabatic Gravitational Perturbation During Reheating
• String Gas Cosmology and Non-Gaussianities
• S-duality in String Gas Cosmology
• Dynamical Decompactification and Three Large Dimensions
• Constraints on Models with a Break in the Primordial Power Spectrum
• Anisotropies in the Cosmic Microwave Background: Theoretical Foundations
• Bouncing Cosmologies

Cited by in corpus (65)

• Bounce cosmology from $F(R)$ gravity and $F(R)$ bigravity
• Bouncing cosmology in modified Gauss-Bonnet gravity
• Two Field Matter Bounce Cosmology
• A Matter Bounce By Means of Ghost Condensation
• The Matter Bounce Curvaton Scenario
• Anisotropy in a Nonsingular Bounce
• Bouncing cosmological solutions from f(R,T) gravity
• An Extended Matter Bounce Scenario: current status and challenges
• Preheating a bouncing universe
• The Pseudo-Conformal Universe: Scale Invariance from Spontaneous Breaking of Conformal Symmetry
• String Gas Cosmology: Progress and Problems
• Evolution of cosmological perturbations and the production of non-Gaussianities through a nonsingular bounce: Indications for a no-go theorem in single field matter bounce cosmologies
• Bounce universe from string-inspired Gauss-Bonnet gravity
• Viability of the matter bounce scenario in Loop Quantum Cosmology for general potentials
• Bounce solutions in viscous fluid cosmology
• On $R+\alpha R^2$ Loop Quantum Cosmology
• Effect of the Generalized Uncertainty Principle on Post-Inflation Preheating
• Quasi-matter domination parameters in bouncing cosmologies
• Early Structure Formation from Cosmic String Loops in Light of Early JWST Observations
• Preinflationary dynamics in loop quantum cosmology: Monodromy Potential
• Emergent Cosmology from Matrix Theory
• Black hole formation in a contracting universe
• Bounce Loop Quantum Cosmology Corrected Gauss-Bonnet Gravity
• Quantum aspects of chaos and complexity from bouncing cosmology: A study with two-mode single field squeezed state formalism
• Little Rip, $\Lambda$CDM and singular dark energy cosmology from Born-Infeld-$f(R)$ gravity
• String Gas Cosmology after Planck
• Cosmological density perturbations from conformal scalar field: infrared properties and statistical anisotropy
• Reheating after S-Brane Ekpyrosis
• A Radiation Bounce from the Lee-Wick Construction?
• Gravitational particle production in bouncing cosmologies
• Reconstruction of a Nonminimal Coupling Theory with Scale-invariant Power Spectrum
• Cosmological Perturbations Across an S-brane
• Emergent Universe from Energy-Momentum Squared Gravity
• Tracing Primordial Black Holes in Nonsingular Bouncing Cosmology
• Cosmographic analysis of a closed bouncing universe with the varying cosmological constant in $f(R,T)$ gravity
• Scalar tilt from broken conformal invariance
• Properties of scalar perturbations generated by conformal scalar field
• The Cosmological OTOC: Formulating new cosmological micro-canonical correlation functions for random chaotic fluctuations in Out-of-Equilibrium Quantum Statistical Field Theory
• Searching for a matter bounce cosmology with low redshift observations
• Thermodynamics of nonsingular bouncing universes
• Bounce Universe Induced by an Inhomogeneous Dark Fluid Coupled with Dark Matter
• Unconventional Cosmology
• The Asymptotic Behavior of Bouncing Cosmological Models in $F(\mathcal{G})$ Gravity Theory
• Magnetogenesis in bouncing cosmology
• Particle Production in Ekpyrotic Scenarios
• Background dynamics of pre-inflationary scenario in Brans-Dicke loop quantum cosmology
• How can holonomy corrections be introduced in $f(R)$ gravity?
• Note on Reheating in G-inflation
• Bouncing cosmologies via modified gravity in the ADM formalism: Application to Loop Quantum Cosmology
• Breaking of Spatial Diffeomorphism Invariance, Inflation and the Spectrum of Cosmological Perturbations
• The matter-ekpyrotic bounce scenario in Loop Quantum Cosmology
• Primordial Gravitational Wave Circuit Complexity
• Inhomogeneous Dark Fluid and Dark Matter, Leading to a Bounce Cosmology
• Unitarity Problems for an Effective Field Theory Description of Early Universe Cosmology
• Dynamics of Cosmological Perturbations and Reheating in the Anamorphic Universe
• Towards conformal cosmology
• Anisotropic Bouncing Scenario in $F(X)-V(\varphi )$ model
• Loop Quantum Cosmology with a noncommutative quantum deformed photon gas
• Holographic bounce cosmological models induced by viscous dark fluid from a generalized non-singular entropy function
• Quantum Gravity, Hydrodynamics and Emergent Cosmology: A Collection of Perspectives
• The twilight of the single field slow rolling inflaton
• Extra Dimensions, Dilaton and Dark Energy
• Crunching, Bouncing, and Cyclical Cosmologies from Dark Sector Interactions
• Anisotropic Cyclic Universe in $F(X)-V(\varphi )$ model
• Conformally coupled inflation