Irit Maor, Ram Brustein, Paul J. Steinhardt
Published 2000-07-20, updated 2001-05-03Version 3
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.
Comments: 4 pages, 2 figures; corrected figure 1 (compared to preprint and published versions) and minor changes to text
Journal: Phys.Rev.Lett.86:6,2001; Erratum-ibid.87:049901,2001
Braneworld models of dark energy
Dipole of the luminosity distance: a direct measure of H(z)
Limitations of the Hamiltonian Treatment for Collisionless Astrophysical Accretion Flows
