Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 6, Pages 1162-1165Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.1162
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Observations of high-redshift supernovae indicate that the Universe is accelerating. Here we present a model-independent method for estimating the form of the potential V(phi) of the scalar field driving this acceleration, and the associated equation of state w(phi). Our method is based on a Versatile analytical form for the luminosity distance D-L, optimized to fit observed distances to distant supernovae and differentiated to yield V(phi) and w(phi). Our results favor w(phi) similar or equal to -1 at the present epoch, steadily increasing with redshift. A cosmological constant is consistent with our results.
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