Opportunities for future supernova studies of cosmic acceleration

Details Opportunities for future supernova studies of cosmic acceleration Opportunities for future supernova studies of cosmic acceleration

2000-08-21

arxiv.org/abs/astro-ph/0008314v3

Phys.Rev.Lett.86:1939-1942,2001

Astronomy and Astrophysics

Astrophysics

Four pages including figures. Final published version. No significant changes from v1

Scientific paper

10.1103/PhysRevLett.86.1939

We investigate the potential of a future supernova dataset, as might be obtained by the proposed SNAP satellite, to discriminate among different ``dark energy'' theories that describe an accelerating Universe. We find that many such models can be distinguished with a fit to the effective pressure-to-density ratio, $w$, of this energy. More models can be distinguished when the effective slope, $dw/dz$, of a changing $w$ is also fit, but only if our knowledge of the current mass density, $\Omega_m$, is improved. We investigate the use of ``fitting functions'' to interpret luminosity distance data from supernova searches, and argue in favor of a particular preferred method, which we use in our analysis.

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