Highlight: The Supernova Legacy Survey 3-year sample [...] (vol. 522)

Vol. 523In section 3. Cosmology10 November 2010

The Supernova Legacy Survey 3-year sample: Type Ia supernovae photometric distances and cosmological constraints

by J. Guy, M. Sullivan, A. Conley, et al., A&A 523, A7 alt

One of the most significant problems in cosmology concerns the composition of our Universe. In addition to normal matter, which composes our everyday reality, about six times the mass of this component is found in a more elusive form that cosmologists have dubbed as "dark matter" to indicate that it does not emit or absorb light. However, these two components only make up about one quarter of the total cosmic budget, with the rest provided by a mysterious fluid with negative pressure, whose properties are similar to the famous Einstein's cosmological constant, and which forces cosmic expansion to accelerate. The presence of this fluid has been assessed in the past decade through study of the most distant supernovae in reach, as explained by this paper, which presents a new extensive experiment using 252 supernovae to put such fascinating evidence on even firmer grounds.