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

Kamionkowski, Marc and Buchalter, Ari (2001) The Second Peak: The Dark-Energy Density and the Cosmic Microwave Background. In: Sources and Detection of Dark Matter and Dark Energy in the Universe. Springer , Berlin, pp. 119-127. ISBN 978-3-642-07446-2. https://resolver.caltech.edu/CaltechAUTHORS:20200205-144743826

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Abstract

Supernova evidence for a negative-pressure dark energy (e. g., cosmological constant or quintessence) that contributes a fraction Ω_Λ ≃ 0.7 of closure density has been bolstered by the discrepancy between the total density, Ω_(tot) ≃ 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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/978-3-662-04587-9_11DOIArticle
https://rdcu.be/b3ZGLPublisherFree ReadCube access
ORCID:
AuthorORCID
Kamionkowski, Marc0000-0001-7018-2055
Additional Information:© 2001 Springer-Verlag Berlin Heidelberg. We thank P. Ullio for useful comments. We used CMBFAST [29] to calculate the power spectra. This work was supported in part by NSF AST-0096023, NASA NAGS-8506, and DoE DE-FG03-92-ER40701. AB also acknowledges the support of a Lee A. DuBridge Fellowship.
Funders:
Funding AgencyGrant Number
NSFAST-0096023
NASANAGS-8506
Department of Energy (DOE)DE-FG03-92-ER40701
Lee A. DuBridge FellowshipUNSPECIFIED
Subject Keywords:Dark Energy; Cosmological Constant; Optical Depth; Cosmic Microwave Background; Cosmological Parameter
Record Number:CaltechAUTHORS:20200205-144743826
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200205-144743826
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101146
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:06 Feb 2020 18:24
Last Modified:06 May 2020 22:59

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