Uncorrelated estimates of dark energy evolution

By D. Huterer, A. Cooray. 2004

307 citations recorded by the source corpus.

Type Ia supernova data have recently become strong enough to enable, for the first time, constraints on the time variation of the dark energy density and its equation of state. Most analyses, however, are using simple two or three-parameter descriptions of the dark energy evolution, since it is well known that allowing more degrees of freedom introduces serious degeneracies. Here we present a method to produce uncorrelated and nearly model-independent band power estimates of the equation of state of dark energy and its density as a function of redshift. We apply the method to recently compiled supernova data. Our results are consistent with the cosmological constant scenario, in agreement with other analyses that use traditional parametrizations, though we find marginal (2-sigma) evidence for w(z)<-1 at z<0.2. In addition to easy interpretation, uncorrelated, localized band powers allow intuitive and powerful testing of the constancy of either the energy density or equation of state. While we have used relatively coarse redshift binning suitable for the current set of ~150 supernovae, this approach should reach its full potential in the future, when applied to thousands of supernovae found from ground and space, combined with complementary information from other cosmological probes.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/adc4e5b6f890db6459a79ed519a4420711779ecc

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. A. Riess
2. A. Filippenko
3. D. Schneider
4. Daniel J. Eisenstein
5. R. Kirshner
6. S. Jha
7. D. Weinberg
8. Weidong Li

In Nuclear and High Energy Physics

1. A. Filippenko
2. Yi Wang
3. Shuang Wang
4. Weidong Li
5. Ryan Chornock
6. R. Kirshner
7. S. Jha
8. Miao Li

Citations in the corpus

• Improved Constraints on the Acceleration History of the Universe and the Properties of the Dark Energy (2007, unknown): “This includes the work of Huterer & Starkman (2003), Wang & Tegmark (2004, 2005), Shafieloo et al. (2006), Alam et al. (2004), Nesseris & Perivolaropoulos (2004), Huterer & Cooray (2005), Shapiro&Turner (2006), Turner&Huterer (2007), andAlam et al. (2007), for example.”
• Observational probes of cosmic acceleration (2012, background): “Principal components (PCs) of the dark energy equation of state provide another way to determine which features of the equation of state evolution are best constrained by a given combination of experiments (Huterer and Starkman, 2003; Hu, 2002; Huterer and Cooray, 2005; Wang and Tegmark, 2005; Dick ”
• FIRST-YEAR SLOAN DIGITAL SKY SURVEY-II (SDSS-II) SUPERNOVA RESULTS: CONSTRAINTS ON NONSTANDARD COSMOLOGICAL MODELS (2009, background): “We can, however, decorrelate the wi estimates by (following Huterer & Cooray 2005) changing the basis through an orthogonal matrix rotation that diagonalizes the covariance matrix.”