RSAA Colloquia / Seminars / Feast-of-Facts: Thursday, 19 July 2018, 11:00-12:00; Duffield Lecture Theatre

Boud Roukema

"Hypothesis: dark energy is recent negative average spatial curvature"

The standard model of cosmology, the LambdaCDM (LCDM) model, is based on a shortcut rather than a full application of the Einstein equation to the observed Universe. Several cosmologists working towards more realistic cosmological models, within the context of standard general relativity (the Einstein equation), find that the emergence of negative average spatial curvature over the past 5 to 10 billion years, as a result of the main epoch of formation of the cosmic web of filaments of galaxies, clusters of galaxies, and voids, provides a numerically and observationally realistic dark-energy-free model of the Universe. Separating the LCDM model from relativistic-structure-formation models of the Universe will be one of the challenges for 4MOST and other upcoming deep wide galaxy surveys.