Cosmological Parameter Survey Using the Gravitational Lensing Method

Cosmological Applications of Gravitational Lensing

The last decade has seen an enormous increase of activity in the eld of gravitational lensing, mainly driven by improvements of observational capabilities. I will review the basics of gravitational lens theory, just enough to understand the rest of this contribution, and will then concentrate on several of the main applications in cosmology. Cluster lensing, and weak lensing, will constitute th...

Cosmological Applications of Gravitational Lensing

Cosmological model differentiation through weak gravitational lensing

We investigate the potential of weak gravitational lensing maps to differentiate between distinct cosmological models, considering cosmic variance due to a limited map extension and the presence of noise. We introduce a measure of the differentiation between two models under a chosen lensing statistics. That enables one to determine in which circumstances (map size and noise level), and for whi...

Gravitational lensing of cosmic microwave background anisotropies and cosmological parameter estimation

Gravitational lensing, caused by matter perturbations along the line-of-sight to the last scattering surface, can modify the shape of the cosmic microwave background (CMB) anisotropy power spectrum. We discuss the detectability of lensing distortions to both the temperature and polarisation anisotropy power spectra and we analyse how lensing might affect the estimation of cosmological parameter...

Cosmological Information in the Gravitational Lensing of Pregalactic HI

We study the constraints which currently planned radiotelescopes could place on the nature of dark energy, dark matter and inflation by studying the gravitational lensing of high redshift 21 cm emission, and we compare with the constraints obtainable from wide-angle surveys of galaxy lensing. If the reionization epoch is effectively at z ∼ 8 or later, very large amounts of cosmological informat...