Did the Universe have a beginning?

@article{Vilenkin1992DidTU,
  title={Did the Universe have a beginning?},
  author={Vilenkin},
  journal={Physical review. D, Particles and fields},
  year={1992},
  volume={46 6},
  pages={
          2355-2361
        }
}
  • Vilenkin
  • Published 15 September 1992
  • Philosophy, Physics
  • Physical review. D, Particles and fields
It is argued that eternal inflation'' must have a beginning in time. Conditions are formulated for a spacetime to describe an eternally inflating universe without a beginning, and it is shown that these conditions cannot be satisfied. A rigorous proof is given for a two-dimensional spacetime, and a plausibility argument for four dimensions. 
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References

SHOWING 1-10 OF 21 REFERENCES

Eternal inflation and the initial singularity.

It is shown that a physically reasonable spacetime that is eternally inflating to the future must possess an initial singularity.

THE BIG BANG NEVER HAPPENED

The big bang theory of cosmology - the idea that the universe originated in a single cataclysmic explosion between ten and twenty billion years ago - has become the foundation stone not only of…

Toward the application of a metric size function in galactic evolution and cosmology

We have measured the metric size function eta(r) defined by Petrosian on a limited sample of luminous distant galaxies, up to a redshift of 1.175. Although our investigation has a preliminary…

The physical universe : the interface between cosmology, astrophysics and particle physics : proceedings of the XII Autumn School of Physics held at Lisbon, Portugal, 1-5 October 1990

Meant as a review for students of astrophysics and particle physics, this book contains a selection of survey articles and seminar reports on "high energy cosmology". Included are contributions on…

The discovery of a type Ia supernova at a redshift of 0.31

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On the cosmological significance of the apparent deficit of small interplanetary scintillation sources

The deficit of scintillating sources with small angular sizes, revealed by interplanetary scintillation (IPS) surveys, has led to suggestions that the universe is closed. More recent developments in…

Quantum Theory of Gravity. I. The Canonical Theory

Following an historical introduction, the conventional canonical formulation of general relativity theory is presented. The canonical Lagrangian is expressed in terms of the extrinsic and intrinsic…

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The distinction between Hubble's linear redshift-distance z(L) law and the linear velocity-distance V(L) law that emerged later is discussed, using first the expanding space paradigm and then the…

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We present calculations of the expected statistics of gravitational lensing of quasars in the Hubble Space Telescope snapshot survey. We first model early-type (elliptical and S0) galaxies using…

A possible local counterpart to the excess population of faint blue galaxies

OBSERVATIONS have revealed a population of faint blue galaxies1–5 at intermediate redshifts (z≈0.4). These galaxies are present in significant excess relative to what is expected based on…