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Determining the nature of dark energy ()

Ramy Brustein

The accelerated expansion of our universe, and consequently that it apparently contains a substantial amount of dark energy are still unexplained. Interpreting and understanding the accelerating universe is arguably one of the major scientific challenges of our times. The challenge can be approached on several levels, from the most practical level: how to interpret the data, through an intermediate level: phenomenological models that can be embedded into theories of fundamental physics, to the most profound level: the cosmological constant problem.