Probing the evolution of the dark energy density with future supernova surveys
Abstract
The time dependence of the dark energy density can be an important clue to the nature of dark energy in the universe. We show that future supernova data from dedicated telescopes (such as SNAP), when combined with data of nearby supernovae, can be used to determine how the dark energy density ρX(z) depends on redshift, if ρX(z) is not too close to a constant. For quantitative comparison, we have done an extensive study of a number of dark energy models. Based on these models we have simulated data sets in order to show that we can indeed reconstruct the correct sign of the time dependence of the dark energy density, outside of a degeneracy region centred on 1+w_0 \simeq-w_1 z_{\max }/3 (where zmax is the maximum redshift of the survey; for example, zmax = 1.7 for SNAP).
- Publication:
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Journal of Cosmology and Astroparticle Physics
- Pub Date:
- December 2004
- DOI:
- 10.1088/1475-7516/2004/12/003
- arXiv:
- arXiv:astro-ph/0402080
- Bibcode:
- 2004JCAP...12..003W
- Keywords:
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- Astrophysics;
- High Energy Physics - Phenomenology
- E-Print:
- submitted to PRD