Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-03
Astronomy and Astrophysics
Astrophysics
10 pages, 3 figure, to appear in ASP Conference Series (Proceedings of the "Cosmic Frontiers" conference held in Durham, 31st
Scientific paper
The true nature of dark energy remains unclear: It is either a strange fluid in the Universe, with a negative effective pressure, or a breakdown in General Relativity on large scales. This question can only be answered through a suite of different observations as a function of redshift. In this paper, I will briefly review our attempts to achieve this goal using data from the Sloan Digital Sky Survey (SDSS). In particular, I will present new measurements of the Baryon Acoustic Oscillations (BAO) from the SDSS DR5 galaxy redshift survey as well as outline the on-going SDSSII Supernova Survey, which has already detected (in 2005-06) over 300 SN Ia's over the redshift range 0.05
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