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Related Experiment Videos

Galaxy formation

P J Peebles1

  • 1Joseph Henry Laboratories, Princeton University, Princeton, NJ 08544, USA.

Proceedings of the National Academy of Sciences of the United States of America
|January 14, 1998
PubMed
Summary
This summary is machine-generated.

Early galaxy formation by redshift 10 challenges standard models but aligns with isocurvature dark matter. This model, using a scalar field from inflation, offers new avenues for cosmic structure formation research.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Particle Physics

Background:

  • The standard Big Bang model posits that large galaxies formed early in the universe.
  • Early galaxy assembly presents challenges for the adiabatic cold dark matter model of structure formation.

Purpose of the Study:

  • To explore an alternative cosmological model that can accommodate early galaxy formation.
  • To investigate the implications of an isocurvature dark matter model for cosmic structure formation.

Main Methods:

  • The study analyzes the standard Big Bang cosmological model.
  • It considers an isocurvature dark matter model where dark matter originates from a massive scalar field.
  • The research examines quantum fluctuations during inflation and their impact on field distribution.

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Main Results:

  • Galaxy assembly by redshift z approximately 10 is difficult to reconcile with adiabatic cold dark matter.
  • An isocurvature dark matter model, derived from a squeezed scalar field, could explain early galaxy formation.
  • The distribution of field mass in this model follows the square of a random Gaussian process.

Conclusions:

  • Early galaxy formation suggests a need for alternative dark matter models.
  • Isocurvature dark matter provides a potential framework for understanding early cosmic structure.
  • This model opens new directions for numerical simulations in cosmology.