In the currently favored cosmological model, the energy density of the Universe is dominated by a field of unknown nature - dark energy - acting anti-gravitationally. All our current evidence for the existence of dark energy, whether in the form of a cosmological constant or an evolving field, is indirect and global (based on the effect of dark energy on the Universe as a whole). I will discuss a novel path towards probing dark energy, using galaxy clusters on their largest non-expanding scales. I will show how measurements of the mass enclosed by the boundary between galaxy clusters and the expanding Universe can directly and uniquely probe dark energy locally: on scales much smaller than the observable Universe, and at the present cosmic time.
Topic: Astronomy Department Colloquium
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