384 citations · 699 across the 15 of their papers we have counts for
8 papers · 1 filter
The Chang-Refsdal Lens Revisited
J. An, N. W. Evans
This paper provides a complete theoretical treatment of the point-mass lens perturbed by constant external shear, often called the Chang-Refsdal lens. We show that simple invariant…
Distribution function of the dark matter
N. W. Evans, J. An
There is good evidence from N-body simulations that the velocity distribution in the outer parts of halos is radially anisotropic, with the kinetic energy in the radial direction r…
Dogs that Don't Bark (The Tale of Baryonic Dark Matter in Galaxies)
N. W. Evans
Fifteen years or so ago, it was commonly argued; ``If we want to believe the observations rather than our prejudice, we should take as our best bet that dark haloes are baryonic.''…
The Stability of Disks in Cusped Potentials
J A Sellwood, N W Evans
We confirm that a high rate of shear at the center is able to stabilize an entire stellar disk against bar-forming (m=2) modes, irrespective of the dark halo density. Our simulatio…
Linear multistep methods for integrating reversible differential equations
Wyn Evans, Scott Tremaine
This paper studies multistep methods for the integration of reversible dynamical systems, with particular emphasis on the planar Kepler problem. It has previously been shown by Can…
A Caustic View of Halo Microlensing
E. J. Kerins, N. W. Evans
The only microlensing events towards the Magellanic Clouds for which the location of the lens is strongly constrained are the two binary caustic crossing events. In at least one an…