Gravitational lenses

  title={Gravitational lenses},
  author={Charles R. Alcock},

A geometric probe of cosmology – I. Gravitational lensing time delays and quasar reverberation mapping

We present a novel, purely geometric probe of cosmology based on measurements of differential time delays between images of strongly lensed quasars due to finite source effects. Our approach is

Generalized multi-plane gravitational lensing: time delays, recursive lens equation, and the mass-sheet transformation

We consider several aspects of the generalized multi-plane gravitational lens theory, in which light rays from a distant source are affected by several main deflectors, and in addition by the tidal

Statistical properties of the cosmic density field beyond 2-point statistics

Dunkle Materie, dunkle Energie, kosmische Inflation - unser Verstandnis der drei Hauptzutaten des kosmologischen Standardmodels ist nach wie vor gering. Das deutet auf allgemeine Lucken in unserem

Wave dark matter as a gravitational lens for electromagnetic and gravitational waves

The majority of the matter in the known universe is believed to be in the form of Dark Matter, and its widely accepted description is done by Cold Dark Matter (CDM). Nevertheless, its exact

Precise measurements of time delays in gravitationally lensed quasars for competitive and independent determination of the Hubble constant

During these last decades, by virtue of observations, the Standard Cosmological Model has emerged, providing a description of the Universe's evolution using a minimal set of independent constraints -

A spiral galaxy's mass distribution uncovered through lensing and dynamics

We investigate the matter distribution of a spiral galaxy with a counter-rotating stellar core, SDSS J1331+3628 (J1331), independently with gravitational lensing and stellar dynamical modelling. By

Ray-Tracing through the Millennium Simulation

In this thesis, gravitational lensing in the concordance LambdaCDM cosmology is investigated by carrying out ray-tracing along past light cones through the Millennium Simulation, a very large N-body


We describe a numerical algorithm which simulates the propagation of light in inhomogeneous universes. This algorithm computes the trajectories of light rays between the observer, located at redshift

Gravitational lensing and the maximum number of images

We show that in a configuration of point masses, replacing one of the point deflectors by a spherically symmetric distributed mass only introduces one extra image. This extra image is located inside