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Is the low-l microwave background cosmic?

Dominik J Schwarz1, Glenn D Starkman, Dragan Huterer

  • 1Department of Physics, CERN, Theory Division, 1211 Geneva 23, Switzerland.

Physical Review Letters
|December 17, 2004
PubMed
Summary
This summary is machine-generated.

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Cosmic microwave background anomalies challenge standard cosmology. Large-angle correlations reveal unexpected alignments between cosmic planes and the dipole direction, suggesting new physics may be needed.

Area of Science:

  • Cosmology
  • Astrophysics
  • Statistical analysis of CMB data

Background:

  • The standard inflationary cosmology model predicts specific patterns in the cosmic microwave background (CMB).
  • Observed large-angle (low-l) correlations in the CMB show statistically significant anomalies deviating from these predictions.
  • Previous analyses indicated potential unusual alignments in CMB planes.

Purpose of the Study:

  • To investigate the statistical significance of alignments among the CMB quadrupole and octopole planes.
  • To determine the alignment of these planes with the cosmological dipole and equinoxes.
  • To explore the orthogonality of an octopole plane with the supergalactic plane.

Main Methods:

  • Analysis of large-angle (low-l) correlations in cosmic microwave background data.

Related Experiment Videos

  • Statistical testing to assess the significance of observed plane alignments.
  • Comparison of CMB plane orientations with cosmological features like the dipole and supergalactic plane.

    • Main Results:

    • The quadrupole and octopole planes exhibit a statistically significant alignment (99.9% C.L.).
    • Three octopole planes are orthogonal to the ecliptic (99.1% C.L.), with their normals aligned to the cosmological dipole and equinoxes (99.6% C.L.).
    • The remaining octopole plane is orthogonal to the supergalactic plane (99.6% C.L.).

    Conclusions:

    • The observed alignments represent significant anomalies challenging the standard inflationary cosmology.
    • These findings suggest potential limitations of current cosmological models or the presence of unknown physical processes.
    • Further theoretical and observational work is needed to explain these large-scale CMB anomalies.