Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-01
New Astron.Rev. 49 (2005) 93-96
Astronomy and Astrophysics
Astrophysics
invited overview at Dark Matter/Dark Energy 2004; 6 pages
Scientific paper
10.1016/j.newar.2005.01.025
The physical process leading to the acceleration of the expansion of the universe is unknown. It may involve new high energy physics or extensions to gravitation. Calling this generically dark energy, we examine the consistencies and relations between these two approaches, showing that an effective equation of state function w(z) is broadly useful in describing the properties of the dark energy. A variety of cosmological observations can provide important information on the dynamics of dark energy and the future looks bright for constraining dark energy, though both the measurements and the interpretation will be challenging. We also discuss a more direct relation between the spacetime geometry and acceleration, via ``geometric dark energy'' from the Ricci scalar, and superacceleration or phantom energy where the fate of the universe may be more gentle than the Big Rip.
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