Weak Gravitational Lensing

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The Components of the Universe Dark Energy 73% All of chemistry, biology, physics… Neutrinos 0.3% Stars 0.4% H, He Gas 4% 23% Dark Matter
Weak Gravitational Lensing Weak lensing effect cannot be measured from any individual galaxy. Must be measured statistically over many galaxies z galaxy ≈1 z z observer =0 lens ≈0.3– 0.5 If there is any intervening large-scale structure, light follows the distorted path (exaggerated). Background images are magnified and sheared by ~2%, mapping a circle into an ellipse. Like glass lenses, gravitational lenses are most effective when placed half way between the source and the observer.
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