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A chaotic cosmology.

J D Barrow1

  • 1Department of Astrophysics, Oxford University, UK.

Nature
|May 12, 1977
PubMed
Summary
This summary is machine-generated.

This study proposes a cosmological model where shear fluctuations create inhomogeneity, explaining the universe's heat content and large-scale isotropy. This model naturally incorporates black holes for galaxy formation, avoiding specific small black hole predictions.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Theoretical Physics

Background:

  • The universe exhibits large-scale isotropy and homogeneity, yet possesses significant heat content.
  • Explaining these properties requires models that reconcile early universe conditions with current observations.

Purpose of the Study:

  • To propose a novel anisotropic, inhomogeneous cosmological model.
  • To explain the universe's high heat content, isotropy, and homogeneity using shear fluctuations and neutrino interactions.
  • To provide a framework for galaxy formation and morphology.

Main Methods:

  • Developing an anisotropic, inhomogeneous cosmological model.
  • Investigating the role of shear fluctuations in generating inhomogeneity.
  • Analyzing dissipative heating by collisional neutrinos.

Related Experiment Videos

  • Examining the conditions for early universe isotropization and entropy production.
  • Incorporating a natural origin for black holes.

    • Main Results:

    • Shear fluctuations are shown to be a sufficient condition for dissipative heating by collisional neutrinos, explaining the universe's heat content (S(b o) ~ 10^8).
    • The model achieves early isotropization and high entropy, consistent with observed light element abundances.
    • A natural population of black holes arises, offering a basis for galaxy formation theories.

    Conclusions:

    • The proposed cosmological model successfully explains key features of the universe, including its heat content, isotropy, and homogeneity.
    • The model provides a consistent framework for early universe nucleosynthesis and galaxy formation.
    • It does not necessitate the existence of specific small black hole masses (e.g., 10^15 g).