839 citations · 24.6k across the 409 of their papers we have counts for
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Microlensing induced absorption line variability
Geraint F. Lewis, Rodrigo A. Ibata
Gravitational microlensing has proven to be a powerful probe of both the structure at the heart of quasars and the mass function of compact objects in foreground lenses. This paper…
Nanolensing of gamma-ray bursts
Mark A. Walker, Geraint F. Lewis
All quasars vary in their optical flux on a time-scale of years, and it has been proposed that these variations are principally due to gravitational lensing by a cosmologically dis…
Kinematic outliers in the LMC: constraints on star-star microlensing
HongSheng Zhao, Rodrigo Ibata, Geraint Lewis +1
Although a decade of microlensing searches towards the Large Magellanic Cloud (LMC) has detected 13-25 possible microlensing events, the nature and the location of the lenses, bein…
Cosmology on a Mesh
Stuart P. D. Gill, Alexander Knebe, Brad K. Gibson +3
An adaptive multi grid approach to simulating the formation of structure from collisionless dark matter is described. MLAPM (Multi-Level Adaptive Particle Mesh) is one of the most…
An investigation of gravitational lens determinations of H_o in quintessence cosmologies
Geraint F. Lewis, Rodrigo A. Ibata
There is growing evidence that the majority of the energy density of the universe is not baryonic or dark matter, rather it resides in an exotic component with negative pressure. T…
Evidence for Stellar Substructure in the Halo and Outer Disk of M31
Annette Ferguson, Mike Irwin, Rodrigo Ibata +2
We report the discovery of significant stellar substructure in the halo and outer disk of our nearest large galactic neighbour, M31. Our deep panoramic survey with the Isaac Newton…