Inflationary universe: A possible solution to the horizon and flatness problems

  title={Inflationary universe: A possible solution to the horizon and flatness problems},
  author={Alan Harvey Guth},
  journal={Physical Review D},
  • A. Guth
  • Published 15 January 1981
  • Physics
  • Physical Review D
The standard model of hot big-bang cosmology requires initial conditions which are problematic in two ways: (1) The early universe is assumed to be highly homogeneous, in spite of the fact that separated regions were causally disconnected (horizon problem); and (2) the initial value of the Hubble constant must be fine tuned to extraordinary accuracy to produce a universe as flat (i.e., near critical mass density) as the one we see today (flatness problem). These problems would disappear if, in… 

Inflation in the Universe, circa 1986

The hot big bang cosmology, or the standard cosmology as it is appropriately known, is a highly successful model, providing a reliable and tested accounting of the Universe from 0.01 s after the bang

Aspects of spectator fields in post-inflationary resonant particle production

Grounded in the increasingly accurate astronomical observations of the past few decades, the study of cosmology has produced a comprehensive account of the history of the universe. This account is

Scale Invariant Inflation

The period of inflation in the early universe is a well-established paradigm in standard cosmology due to its success at solving various observational problems, as well as providing measurable

The horizon problem as a clue: a smooth big bang?.

The necessary and sufficient condition for the absence of particle horizons in a big bang Friedmann-Robertson-Walker universe is provided. It happens to be a "smooth big bang" initial condition: the

String Theory and Pre-big bang Cosmology

Summary. In string theory, the traditional picture of a Universe that emerges from the inflation of a very small and highly curved space-time patch is a possibility, not a necessity: quite different

Theoretical considerations in the use of scalar-tensor theories of gravity in inflationary models

The inflationary paradigm is one which was designed to answer questions that arose from classical Hot Big Bang cosmology. The period of rapid expansion in the early Universe provides a mechanism to

The flatness problem as a natural cosmological phenomenon

An interplay between elementary particle interactions at very high energies and the expansion of the Universe is studied in the context of the inflationary model to find a possible explanation for an

New old inflation

We propose a new class of inflationary solutions to the standard cosmological problems (horizon, flatness, monopole,...), based on a modification of old inflation. These models do not require a

The Problem of Observation in Cosmology and the Big Bang

The understanding of universe has to utilize experimental data from the present to deduce the state of the universe in distant regions which implies in the distant past. Also, theories have to

Stability of Extra Dimensions in the Inflating Early Universe

Cosmic inflation is an attractive paradigm to explain the initial conditions of the universe. It can be conveniently described by the dynamics of a single scalar field within N = 1 supergravity. Due



Effects of phase transitions on the evolution of the early universe

In spontaneously broken gauge theories, the gauge symmetry is restored at high temperatures, i.e., in the early universe. As the universe cools, it undergoes a phase transition from the symmetric to

General Relativity; an Einstein Centenary Survey

List of contributors Preface 1. An introductory survey S. W. Hawking and W. Israel 2. The confrontation between gravitation theory and experiment C. M. Will 3. Gravitational-radiation experiments D.

Cosmological lower bound on the Higgs-boson mass

Cosmological considerations imply that the Weinberg-Salam Higgs boson mass m/sub H/> or approx. =9 GeV. If this bound were violated, the symmetry-breaking phase transition would occur only after

Other grand unified models include the SO(10) model: H. Georgi, in Particles and Fields

  • Other grand unified models include the SO(10) model: H. Georgi, in Particles and Fields
  • 1975

In our case lIl(Ho) is the group of integers. For a general review of topology written for physicists, see

  • 29. If Ill(G) and I12(G) are both trivial, then X2(G/Ho) = Rl
  • 1979

The simplest grand unified model is the SU(5) model of See also

  • Phys. Rev. Lett
  • 1974