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: http://dx.doi.org/10.1111/j.1365-2966.2010.17054.x
Imprints of dynamical dark energy on weak-lensing measurements

More Like This

Show all results sharing this subject:

  • Astronomy and Astrophysics

GO

Show Summary Details

Preview

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

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.