The emergent universe: an explicit construction
TLDR
In this article, the authors provide a realization of a singularity-free inflationary universe in the form of a simple cosmological model dominated at early times by a single minimally coupled scalar field with a physically based potential.Abstract:
We provide a realization of a singularity-free inflationary universe in the form of a simple cosmological model dominated at early times by a single minimally coupled scalar field with a physically based potential. The universe starts asymptotically from an initial Einstein static state, which may be large enough to avoid the quantum gravity regime. It enters an expanding phase that leads to inflation followed by reheating and a standard hot big bang evolution. We discuss the basic characteristics of this emergent model and show that none is at odds with current observations.read more
Citations
More filters
Journal ArticleDOI
Modified gravity theories on a nutshell: Inflation, bounce and late-time evolution
TL;DR: In this paper, the authors systematically review some standard issues and also the latest developments of modified gravity in cosmology, emphasizing on inflation, bouncing cosmology and late-time acceleration era.
Journal ArticleDOI
Loop Quantum Cosmology
TL;DR: In this paper, an application of loop quantum cosmology to homogeneous systems, which removes classical singularities, is presented, where the main effects are introduced into effective classical equations, which allow one to avoid the interpretational problems of quantum theory.
Journal ArticleDOI
Dark Energy from structure: a status report
Thomas Buchert,Thomas Buchert +1 more
TL;DR: In this paper, the authors provide an overview over the Dark Energy debate in connection with the impact of inhomogeneities, and formulates strategies for a comprehensive quantitative evaluation of backreaction effects both in theoretical and observational cosmology.
Journal ArticleDOI
Relativistic cosmology and large-scale structure
TL;DR: In this article, a review of general-relativistic dynamics and perturbations of the standard cosmological model, the Friedmann-Lemaitre universe, and how these can explain and predict the properties of the observable universe is presented.
Journal ArticleDOI
An Emergent Universe from a loop
TL;DR: In this paper, the existence and stability of closed, singularity-free, inflationary cosmological models have been studied in the context of general relativity, and an explicit emergent model of this type, in which amore-» nonsingular past-eternal oscillating universe enters a phase where the symmetry of the oscillations is broken, leading to an emergent inflationary epoch, while satisfying all observational and semiclassical constraints.
References
More filters
Journal ArticleDOI
First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Determination of cosmological parameters
David N. Spergel,Licia Verde,Hiranya V. Peiris,Eiichiro Komatsu,M. R. Nolta,Charles L. Bennett,Mark Halpern,Gary Hinshaw,N. Jarosik,Alan J. Kogut,Michele Limon,Michele Limon,S. S. Meyer,Lyman A. Page,Gregory S. Tucker,Gregory S. Tucker,Gregory S. Tucker,Janet L. Weiland,Edward J. Wollack,Edward L. Wright +19 more
TL;DR: In this article, the authors find that the emerging standard model of cosmology, a flat -dominated universe seeded by a nearly scale-invariant adiabatic Gaussian fluctuations, fits the WMAP data.
Journal ArticleDOI
A new type of isotropic cosmological models without singularity
TL;DR: In this paper, the Einstein equations with quantum one-loop contributions of conformally covariant matter fields are shown to admit a class of nonsingular isotropic homogeneous solutions that correspond to a picture of the universe being initially in the most symmetric (de Sitter) state.
Book
The Early Universe
Edward W. Kolb,Michael S. Turner +1 more
TL;DR: In this article, the Robertson-Walker Metric is used to measure the radius of the Planck Epoch in the expanding universe, which is a measure of the number of atoms in the universe.
Journal ArticleDOI
The early Universe
TL;DR: In the early 1990s, the NSF's Institute for Theoretical Physics in Santa Barbara devoted a 6-month program and an intensive 1-week workshop to the subject as discussed by the authors.
Book
Cosmological Inflation and Large-Scale Structure
Andrew R. Liddle,David H. Lyth +1 more
TL;DR: This textbook is the first to provide a modern and unified overview of inflationary cosmology and carefully compares predictions with the latest observations, including those of the cosmic microwave background, the clustering and velocities of galaxies and the epoch of structure formation.