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Discovery Projects - Grant ID: DP140100094

Title
Discovery Projects - Grant ID: DP140100094
Funding
ARC | Discovery Projects
Contract (GA) number
DP140100094
Start Date
2014/01/01
End Date
2016/12/31
Open Access mandate
no
Organizations
-
More information
http://purl.org/au-research/grants/arc/DP140100094

 

  • A Simple and Practical Algorithm for Accurate Gravitational Magnification Maps

    Walters, S. J.; Forbes, L. K. (2016)
    Projects: ARC | Discovery Projects - Grant ID: DP140100094 (DP140100094)
    In this brief communication a new method is outlined for modelling magnification patterns on an observer's plane using a first order approximation to the null geodesic path equations for a point mass lens. For each ray emitted from a source, an explicit calculation is made for the change in position on the observer's plane due to each lens mass. By counting the number of points in each small area of the observer's plane, the magnification at that point can be determined. This allows for a ver...

    A Note on the Overall Magnification of a Gravitational Point-Source-Point-Lens System

    Walters, S. J.; Forbes, L. K. (2015)
    Projects: ARC | Discovery Projects - Grant ID: DP140100094 (DP140100094)
    The total magnification due to a point lens has been of particular interest as the theorem that gravitational lensing results in light amplification for all observers appears to contradict the conservation of photon number. This has been discussed several times, and various resolutions have been offered. In this note, we use a kinematic approach to provide a formula for the magnification factor for the primary image accurate to first order and valid for rays leaving the source at any trajecto...
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