
TY  - JOUR
A1  - Cook, MW 
T1  - On Gravitational Aberrations in Stellar Images
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1972
VL  - 25
IS  - 6
SP  - 749
EP  - 758
KW  - 
UR  - https://doi.org/10.1071/PH720749 
N2  - On the basis of a cosmological model which is fundamentally of the Friedmann expanding type with a spherically symmetric inhomogeneity superimposed, a study is made of three gravitational aberrations of purely relativistic origin observed in the images of stellar objects: (1) the "gravitational lens" effect, (2) a dispersion effect whereby a point source would produce a diffuse image, and (3) an 'apparent systematic motion of all light sources towards (or away from) the inhomogeneity. Admissable inhomogeneities in the model must satisfy PU ? 2×104 Mpc, where P is the ratio of the average density of matter within the inhomogeneity to the average density of the universe and U is its diameter in megaparsecs. The assumption is also made that the paths of light rays are described by the null-geodesic equations of the space-time under consideration. 
ER  -

