Beyond Two Dark Energy Parameters

Details Beyond Two Dark Energy Parameters Beyond Two Dark Energy Parameters

2007-09-10

arxiv.org/abs/0709.1150v2

Phys.Rev.Lett.100:241302,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure; Discussion expanded to include next-generation BAO surveys and possible systematics in SN surveys; reflects

Scientific paper

10.1103/PhysRevLett.100.241302

Our ignorance of the dark energy is generally described by a two-parameter equation of state. In these approaches a particular {\it ad hoc} functional form is assumed, and only two independent parameters are incorporated. We propose a model-independent, multi-parameter approach to fitting the dark energy, and show that next-generation surveys will constrain the equation of state in three or more independent redshift bins to better than 10%. Future knowledge of the dark energy will surpass two numbers (e.g., [$w_0$,$w_1$] or [$w_0$,$w_a$]), and we propose a more flexible approach to the analysis of present and future data.

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