Phys. Rev. Lett. 100, 241302 (2008) [4 pages]Beyond Two Dark Energy ParametersReceived 6 September 2007; revised 6 April 2008; published 19 June 2008 Our ignorance of dark energy is generally described by a two-parameter equation of state. In these approaches, a particular ad hoc functional form is assumed, and only two independent parameters are incorporated. We propose a model-independent, multiparameter approach to fitting 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 dark energy will surpass two numbers (e.g., [w0,w1] or [w0,wa]), and we propose a more flexible approach to the analysis of present and future data. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.241302
DOI:
10.1103/PhysRevLett.100.241302
PACS:
95.36.+x, 98.62.Py, 98.80.Es
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