Light Propagation in inhomogeneous Universes

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Using a multi-plane lensing method that we have developed, we follow the evolution of light beams as they propagate through inhomogeneous universes. We use a P3M code to simulate the formation and evolution of large-scale structure. The resolution of the simulations is increased to sub-Megaparsec scales by using a Monte Carlo method to locate galaxies inside the computational volume according to the underlying particle distribution. We consider cold dark matter models normalized to COBE, and perform a large parameter survey by varying the cosmological parameters Omega₀, lambda₀, H₀, and n (the tilt of the primordial power spectrum).