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M. Tegmark (Univ. of Pennsylvania)
I summarize the latest constraints on dark matter and dark energy from the cosmic microwave background, large-scale structure, lensing, LyA forest clustering, etc, focusing on the following questions: By postulating complicated unseen matter with sufficiently many free parameters, one can fit almost any observational data, so how can we test the underlying physics in a model-independent way? What current and upcoming cosmological constraints can be robustly connected with physical properties of dark matter, initial perturbations, etc?