Limitations in using luminosity distance to determine the equation of state of the universe

Details Limitations in using luminosity distance to determine the equation of state of the universe Limitations in using luminosity distance to determine the equation of state of the universe

2000-07-20

arxiv.org/abs/astro-ph/0007297v3

Phys.Rev.Lett.86:6,2001; Erratum-ibid.87:049901,2001

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures; corrected figure 1 (compared to preprint and published versions) and minor changes to text

Scientific paper

10.1103/PhysRevLett.86.6

Supernova searches have been been suggested as a method for determining precisely the current value and time variation of the equation of state, $w$, of the dark energy component responsible for the accelerated expansion of the Universe. We show that the method is fundamentally limited by the fact that luminosity dista nce depends on $w$ through a multiple integral relation that smears out information about $w$ and its time variatio n. The effect degrades the resolution of $w$ that can be obtained from current d ata.

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