Imprints of dynamical dark energy on weak-lensing measurements

Abstract

We show that simple models of scalar-field dark energy leave a generic enhancement in the weak-lensing power spectrum when compared to the LCDM prediction. In particular, we calculate the linear-scale enhancement in the convergence (or cosmic-shear) power spectrum for two best-fit 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% for sources at redshift ~1. We argue that there are realistic prospects for detecting such an enhancement using the next generation of large telescopes.

10 pages, 8 figures, replacement matches version published in MNRAS

References in corpus (13)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dynamics of dark energy
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Cosmology and the Fate of Dilatation Symmetry
• Dark Energy and the Accelerating Universe
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• First-year Sloan Digital Sky Survey-II (SDSS-II) Supernova Results: Hubble Diagram and Cosmological Parameters
• Effects of Baryons and Dissipation on the Matter Power Spectrum
• Fingerprinting dark energy
• Early structure formation in quintessence models and its implications for cosmic reionisation from first stars
• New Parametrization for the Scale Dependent Growth Function in General Relativity
• Roles of dark energy perturbations in the dynamical dark energy models: Can we ignore them?
• The WMAP normalization of inflationary cosmologies

Cited by in corpus (7)

• The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology
• General Relativity and Cosmology: Unsolved Questions and Future Directions
• Clustering of quintessence on horizon scales and its imprint on HI intensity mapping
• A Semi-analytic Ray-tracing Algorithm for Weak Lensing
• Weak lensing probe of cubic Galileon model
• A gauge-invariant approach to interactions in the dark sector
• Probing dark energy using convergence power spectrum and bi-spectrum