Reconstructing the Cosmic Equation of State from Supernova distances

Details Reconstructing the Cosmic Equation of State from Supernova distances Reconstructing the Cosmic Equation of State from Supernova distances

1999-10-13

arxiv.org/abs/astro-ph/9910231v4

Phys.Rev.Lett. 85 (2000) 1162-1165

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures, uses RevTex. Minor typo's in equations (1) and (10) corrected

Scientific paper

10.1103/PhysRevLett.85.1162

Observations of high-redshift supernovae indicate that the universe is accelerating. Here we present a {\em 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 $w_\phi\simeq -1$ at the present epoch, steadily increasing with redshift. A cosmological constant is consistent with our results.

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