Dynamical dark energy: Current constraints and forecasts
By A. Upadhye, M. Ishak, Paul J. Steinhardt. 2004
153 citations recorded by the source corpus.
We consider how well the dark energy equation of state w as a function of redshift z will be measured using current and anticipated experiments. We use a procedure which takes fair account of the uncertainties in the functional dependence of w on z, as well as the parameter degeneracies, and avoids the use of strong prior constraints. We apply the procedure to current data from the Wilkinson Microwave Anisotropy Probe, Sloan Digital Sky Survey, and the supernova searches, and obtain results that are consistent with other analyses using different combinations of data sets. The effects of systematic experimental errors and variations in the analysis technique are discussed. Next, we use the same procedure to forecast the dark energy constraints achievable by the end of the decade, assuming 8 years of Wilkinson Microwave Anisotropy Probe data and realistic projections for ground-based measurements of supernovae and weak lensing. We find the 2{sigma} constraints on the current value of w to be {delta}w{sub 0}(2{sigma})=0.20, and on dw/dz (between z=0 and z=1) to be {delta}w{sub 1}(2{sigma})=0.37. Finally, we compare these limits to other projections in the literature. Most show only a modest improvement; others show a more substantial improvement, but there are seriousmore » concerns about systematics. The remaining uncertainty still allows a significant span of competing dark energy models. Most likely, new kinds of measurements, or experiments more sophisticated than those currently planned, are needed to reveal the true nature of dark energy.« less
Subfields: Astronomy and Astrophysics, Oceanography
View Paper: https://www.semanticscholar.org/paper/33ac2fe99c5605a39da3e6571fd845aff5605f16
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Citations in the corpus
- Detection of large-scale intrinsic ellipticity—density correlation from the Sloan Digital Sky Survey and implications for weak lensing surveys (2005, background): “…Abazajian & Dodelson 2003; Benabed & Van Waerbeke 2004; Bernstein & Jain 2004; Ishak et al. 2004; Ishak 2005; Song & Knox 2005; Tereno et al. 2005; Upadhye et al. 2005), and has the clear advantage of being the simplest of the low-redshift cosmological probes to understand theoretically, since it…”
- A kinematical approach to dark energy studies (2006, background): “…et al. 2004; Allen et al. 2004; Astier et al. 2005; Spergel et al. 2006; Cabre et al. 2006) and models in which w(z) crosses the boundary w = −1 c© 2005 RAS, MNRAS 000, 1–12 (Jassal et al. 2005; Corasaniti et al. 2004; Seljak et al. 2005; Rapetti et al. 2005; Upadhye et al. 2005; Zhao et al. 2006).”
- Phantom energy traversable wormholes (2005, background): “In fact, recent fits to supernovae, cosmic microwave background radiation and weak gravitational lensing data indicate that an evolving equation of state ω which crosses −1 is mildly favored [35, 36].”
- The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology (2014, background): “ Tegmark (1999); Zhu (2000); Hu (2001, 2002); Pen et al. (2003); Bernardeau (2003); Benabed and van Waerbeke (2004); Bernstein and Jain (2004); Hu and Jain (2004); Kuhlen et al. (2004); Ishak (2005); Upadhye et al. (2005); Hannestad et al. (2006); Ishak (2007); Shapiro and Dodelson (2007); La Vacca ”
- The ESSENCE Supernova Survey: Survey Optimization, Observations, and Supernova Photometry (2007, background): “However, the form of such a parameterization is at present largely unrestricted and the choice of arbitrary parameterizations influences the conclusions derived from the analysis of the data (Upadhye et al. 2005).”