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Related Experiment Videos

Can cosmic structure form without dark matter?

Scott Dodelson1, Michele Liguori

  • 1Particle Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, USA.

Physical Review Letters
|February 7, 2007
PubMed
Summary
This summary is machine-generated.

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Dark matter evidence, like large cosmic overdensities, requires enhanced structure growth since recombination. This study shows Bekenstein

Area of Science:

  • Cosmology
  • Astrophysics
  • Theoretical Physics

Background:

  • The existence of dark matter is supported by observations of large overdense regions in the Universe.
  • These overdense regions imply that cosmic perturbations have grown significantly since the epoch of recombination (z*).
  • Standard cosmological models based on general relativity do not fully explain this enhanced growth without dark matter.

Purpose of the Study:

  • To investigate alternative theories that can explain the observed enhanced growth of cosmic structures.
  • To explore whether modified gravity theories can account for the observed overdensities without invoking dark matter.

Main Methods:

  • Theoretical analysis of structure formation within alternative gravity frameworks.
  • Focus on Bekenstein's relativistic version of modified Newtonian dynamics (MOND).

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Main Results:

  • Enhanced growth of perturbations, a key indicator for dark matter, can occur in alternative gravity theories.
  • Specifically, Bekenstein's relativistic MOND model demonstrates the potential for such enhanced growth.

Conclusions:

  • The observed large-scale structures in the Universe may be explained by modified gravity theories.
  • Bekenstein's relativistic MOND offers a viable alternative to dark matter for explaining cosmic structure formation.