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Issue A&A
Volume 380, Number 1, December II 2001
Page(s) 6 - 18
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20011398



A&A 380, 6-18 (2001)
DOI: 10.1051/0004-6361:20011398

Supernovae and the nature of the dark energy

M. Goliath1, 2, R. Amanullah3, P. Astier2, A. Goobar3 and R. Pain2

1  Swedish Defence Research Agency (FOI), S-172 90 Stockholm, Sweden
2  Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), IN2P3 -CNRS, Universités Paris VI & VII, 4 place Jussieu, Tour 33 -Rez de Chaussée, 75252 Paris Cedex 05, France
    e-mail: astier@in2p3.fr,rpain@in2p3.fr
3  Fysikum, Stockholm University, Box 6730, 113 85 Stockholm, Sweden
    e-mail: rahman@physto.se,ariel@physto.se

(Received 2 April 2001 / Accepted 2 October 2001 )

Abstract
The use of Type Ia supernovae as calibrated standard candles is one of the most powerful tools to study the expansion history of the universe and thereby its energy components. While the analysis of some ~50 supernovae at redshifts around $z \sim 0.5$ has provided strong evidence for an energy component with negative pressure, "dark energy" , more data is needed to enable an accurate estimate of the amount and nature of this energy. This might be accomplished by a dedicated space telescope, the SuperNova / Acceleration Probe (2000; SNAP), which aims at collecting a large number of supernovae with z< 2. In this paper we assess the ability of the SNAP mission to determine various properties of the "dark energy." To exemplify, we expect SNAP, if operated for three years to study Type Ia supernovae, to be able to determine the parameters in a linear equation of state w(z)=w0+w1 z to within a statistical uncertainty of $\pm0.04$ for w0 and +0.15-0.17 for w1 assuming that the universe is known to be flat and an independent high precision $(\sigma_{\Omega_{\rm m}}=0.015)$ measurement of the mass density $\Omega_{\rm m}$, is used to constrain the fit. A further improvement can be obtained if, in addition to the high-z events, a large number of low-z supernovae are included in the sample.


Key words: cosmology: cosmological parameters -- cosmology: dark matter -- stars: supernovae: general -- gravitational lensing

Offprint request: M. Goliath, Martin.Goliath@foi.se




© ESO 2001


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