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Squeezing MOND into a Cosmological Scenario.

Arthur Lue1, Glenn D Starkman

  • 1Center for Education and Research in Cosmology and Astrophysics, Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106-7079, USA.

Physical Review Letters
|April 20, 2004
PubMed
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Modified gravity (MOND) may explain cosmic expansion by linking gravity to cosmic acceleration. While compatible with late-time expansion, MOND cosmologies struggle with early structure formation and reionization.

Area of Science:

  • Cosmology
  • Astrophysics
  • Modified Gravity

Background:

  • Modified Newtonian Dynamics (MOND) offers an alternative to dark matter for explaining gravitational anomalies.
  • MOND's compatibility with cosmic expansion and structure formation remains a significant research question.

Purpose of the Study:

  • To kinematically identify MOND cosmologies compatible with cosmic expansion.
  • To investigate the viability of MOND in explaining both large-scale cosmic expansion and early structure formation.

Main Methods:

  • Analyzing MOND cosmologies under the assumption of Birkhoff's law.
  • Investigating the implications of MOND for cosmic expansion history and density perturbations.
  • Assessing compatibility with observational data, including late-time expansion and early reionization.

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Main Results:

  • MOND cosmologies are naturally compatible with the observed late-time expansion history.
  • The critical acceleration in MOND requires a slight dependence on source mass (a(0) ~ M(1/3)).
  • MOND cosmologies capable of producing sufficient density perturbations for structure formation are contrived and fine-tuned.

Conclusions:

  • MOND provides a viable framework for explaining cosmic expansion, aligning with late-time observations.
  • Significant challenges remain for MOND in accounting for early universe structure formation.
  • MOND cosmologies may be marginally excluded by evidence of early reionization at z ~ 20.