Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21330904s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #309.04; Bulletin of the American Astronomical Society, Vol. 41, p.284
Astronomy and Astrophysics
Astronomy
Scientific paper
One of the most viable explanations for the accelerated expansion of the universe at the present epoch entails a mysterious dark energy component in the energy budget of the universe. Although the existence of dark energy has been corroborated by several independent studies over the past decade, there is no compelling theoretical explanation for its existence. In order to learn more about this mysterious dark energy, a number of current and future observational studies are aimed at constraining its equation of state (EOS) with unprecedented precision. However, to reach the goal, one needs to have an unbiased description of the EOS and should carefully consider any possible systematic uncertainties. Fitting data to an assumed functional form (as adopted by the Dark Energy Task Force) might bias our knowledge of dark energy. In the first part of the talk, I will try to motivate a model-independent approach to constrain the EOS with current and future observations. I will show that we can measure three or more independent EOS parameters by combining future surveys. I will also discuss a scheme to optimize the binned estimates of dark energy EOS, given any set of observational data. I will then discuss the potential systematics in constraining dark energy with observations of type Ia supernovae. In this context I will mainly concentrate on two possible systematics: the implications of two distinct populations of type Ia supernovae on parameter estimation, and the bias introduced in the measurement of the EOS due to the impact of gravitational lensing of SNe.
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