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Cosmic microwave background snapshots: pre-WMAP and post-WMAP.

J Richard Bond1, Carlo Contaldi, Dmitry Pogosyan

  • 1Canadian Institute for Advanced Research, Cosmology and Gravity Program, Canadian Institute for Theoretical Astrophysics, McLennan Physical Laboratories, University of Toronto, 60 St George Street, Toronto, Ontario M5S 3H8, Canada.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|December 12, 2003
PubMed
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Cosmic Microwave Background (CMB) data analysis has refined cosmological parameters, supporting early universe inflation and current dark energy dominance. Precision measurements confirm key aspects of the standard cosmological model.

Area of Science:

  • Cosmology
  • Astrophysics
  • Particle Physics

Background:

  • The Cosmic Microwave Background (CMB) power spectrum C(l) provides crucial data for understanding the universe's evolution.
  • Previous experiments (Boomerang, Maxima, DASI, CBI, VSA, ARCHEOPS, ACBAR) extended measurements of C(l) to higher multipoles (l).
  • The Wilkinson Microwave Anisotropy Probe (WMAP) provided exquisite one-year results, dominating lower multipole bands.

Purpose of the Study:

  • To analyze the evolution of the CMB power spectrum and its implications for cosmological parameters.
  • To test minimal inflation models using updated CMB data and external priors.
  • To constrain parameters related to early universe expansion and current dark energy dominance.

Main Methods:

  • Analysis of CMB anisotropy results from various experiments, including pre- and post-WMAP data.

Related Experiment Videos

  • Application of a minimal inflation parameter set: [omega(b), omega(cdm), Omega(tot), Omega(Lambda), n(s), tau(C), sigma(8)].
  • Utilized C(l) database and Monte Carlo Markov Chain (MCMC) methods with diverse prior constraints (e.g., HST-h, SN1, LSS).

    • Main Results:

    • Pre-WMAP and WMAP data show excellent agreement, significantly strengthening the case for cosmic acceleration.
    • Cosmological parameters derived are highly stable across different priors and time, with increasing precision.
    • Key parameters include Omega(tot) ~ 1.02, n(s) ~ 0.97, omega(b) ~ 0.022, omega(cdm) ~ 0.12, Omega(Lambda) ~ 0.70, and sigma(8) ~ 0.86.

    Conclusions:

    • The results are consistent with inflationary theory and dark energy dominance.
    • The data supports a nearly scale-invariant spectrum and a cosmological constant (w(Q) = -1).
    • The derived sigma(8) implies a significant Sunyaev-Zel'dovich effect, requiring further investigation at high multipoles.