Smoothing Supernova Data to Reconstruct the Expansion History of the Universe
نویسندگان
چکیده
We propose a non-parametric method of smoothing supernova data over redshift using a Gaussian kernel which allows us to reconstruct important cosmological quantities including H(z) and w(z) in a model independent manner. This method is shown to be successful in discriminating between different models of dark energy when the quality of data is commensurate with that expected from the future SuperNova Acceleration Probe (SNAP). We find that the Hubble parameter is especially well-determined and useful for this purpose. By refining the method, it is also possible to obtain reasonable bounds on the equation of state of dark energy.
منابع مشابه
Smoothing Supernova Data to Reconstruct the Expansion History of the Universe and its Age
We propose a non-parametric method of smoothing supernova data over redshift using a Gaussian kernel in order to reconstruct important cosmological quantities including H(z) and w(z) in a model independent manner. This method is shown to be successful in discriminating between different models of dark energy when the quality of data is commensurate with that expected from the future SuperNova A...
متن کاملModel independent reconstruction of the expansion history of the universe and the properties of dark energy
We have improved upon the method of smoothing supernovae data to reconstruct the expansion history of the universe, h(z), using two latest datasets, Gold and SNLS. The reconstruction process does not employ any parameterisation and is independent of any dark energy model. The reconstructed h(z) is used to derive the distance factor A up to redshift 0.35 and the results are compared with the giv...
متن کاملLarge-scale Structure of the Universe as a Cosmic Standard Ruler
We propose to use the large-scale structure of the universe as a cosmic standard ruler, based on the fact that the pattern of galaxy distribution should be maintained in the course of time on large scales. By examining the scale-dependence of the pattern in different redshift intervals it is possible to reconstruct the expansion history of the universe, and thus to measure the cosmological para...
متن کاملAccelerating Universe and Cosmological Perturbation in the Ghost Condensate
In the simplest Higgs phase of gravity called ghost condensation, an accelerating universe with a phantom era (w < −1) can be realized without ghost or any other instabilities. In this paper we show how to reconstruct the potential in the Higgs sector Lagrangian from a given cosmological history (H(t), ρ(t)). This in principle allows us to constrain the potential by geometrical information of t...
متن کاملThe Acceleration of the Expansion of the Universe: A Brief Early History of the Supernova Cosmology Project (SCP)
It is now about 10 years since the evidence, based on Type Ia supernovae, for the acceleration of the expansion of the Universe was discovered. I will discuss some aspects of the work and events in the Supernova Cosmology Project (SCP), during the period 1988 to 1998, which led to this discovery. Talk presented at Dark Matter Conference DM08, Marina del Rey, Feb. 20, 2008.
متن کامل