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The Second Peak: The Dark-Energy Density and the Cosmic Microwave Background

  • Marc Kamionkowski
  • Ari Buchalter
Conference paper

Abstract

Supernova evidence for a negative-pressure dark energy (e. g., cosmological constant or quintessence) that contributes a fraction ΩΛ ≃ 0.7 of closure density has been bolstered by the discrepancy between the total density, Ωtot ≃ 1, suggested by the location of the first peak in the cosmic microwave background (CMB) power spectrum and the nonrelativistic-matter density Ω m ≃ 0.3 obtained from dynamical measurements. Here we show that the impending identification of the location of the second peak in the CMB power spectrum will provide an immediate and independent probe of the cosmological constant. As an aside, we show how the measured height of the first peak probably already points toward a low matter density and places upper limits to the reionization optical depth and gravitational-wave amplitude.

Keywords

Dark Energy Cosmological Constant Optical Depth Cosmic Microwave Background Cosmological Parameter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Marc Kamionkowski
    • 1
  • Ari Buchalter
    • 1
  1. 1.California Institute of TechnologyPasadenaUSA

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