Journal Article

Imprints of dynamical dark energy on weak-lensing measurements

Sirichai Chongchitnan and Lindsay King

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 3, pages 1989-1997
Published in print September 2010 | ISSN: 0035-8711
Published online September 2010 | e-ISSN: 1365-2966 | DOI:
Imprints of dynamical dark energy on weak-lensing measurements

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We show that simple models of scalar-field dark energy leave a generic enhancement in the weak-lensing power spectrum when compared to the Λ cold dark matter (ΛCDM) prediction. In particular, we calculate the linear-scale enhancement in the convergence (or cosmic-shear) power spectrum for two best-fitting models of scalar-field dark energy, namely the Ratra–Peebles and SUGRA-type quintessence. Our calculations are based on linear perturbation theory, using gauge-invariant variables with carefully defined adiabatic initial conditions. We find that geometric effects enhance the lensing power spectrum on a broad range of scales, whilst the clustering of dark energy gives rise to additional power on large scales. The dark-energy power spectrum for these models are also explicitly obtained. On degree scales, the total enhancement may be as large as 30–40 per cent for sources at redshift ∼1. We argue that there are realistic prospects for detecting such an enhancement using the next generation of large telescopes.

Keywords: gravitational lensing: weak; dark energy

Journal Article.  5694 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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