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Related Experiment Videos

Inflation from quantum geometry.

Martin Bojowald1

  • 1Center for Gravitational Physics and Geometry, The Pennsylvania State University, 104 Davey Lab, University Park, Pennsylvania 16802, USA. bojowald@gravity.psu.edu

Physical Review Letters
|December 18, 2002
PubMed
Summary
This summary is machine-generated.

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Quantum geometry explains cosmic inflation and the universe's expansion without new physics. This quantum gravity modification of matter Hamiltonians also accounts for the universe's tiny present-day acceleration.

Area of Science:

  • Cosmology
  • Quantum Gravity
  • Theoretical Physics

Background:

  • Standard cosmological models require additional fields for inflation.
  • The observed cosmological acceleration is remarkably small.

Purpose of the Study:

  • To explain cosmic inflation using quantum geometry.
  • To account for the small cosmological acceleration without ad hoc potentials.

Main Methods:

  • Applying quantum gravity modifications to matter Hamiltonians.
  • Analyzing the kinetic part of ordinary matter Hamiltonians.

Main Results:

  • The universe naturally evolves through an inflationary phase at small volumes.
  • A graceful exit into the standard Friedmann phase is predicted.

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  • The mechanism explains the small magnitude of the present-day cosmological acceleration.

    • Conclusions:

    • Quantum geometry offers a unified explanation for cosmic inflation and acceleration.
    • No additional matter fields or potentials are needed.
    • Quantum gravity modifications are key to understanding cosmic evolution.